Unofficial Royal Enfield Community Forum

General Discussion => Tech Tips => Topic started by: Ice on March 19, 2013, 05:45:34 am

Title: Successful carb settings redeux
Post by: Ice on March 19, 2013, 05:45:34 am
 We used to have a thread "successful carb settings" that was lost during the jump to the new forum format.

 It contained tons of useful information posted by our forum members.

Lets REbuild it by posting our carb type, jetting and settings, altitude intake engine and exhaust mods and other pertinent information here.

Mods, delete this thread if it's inappropriate or turns out to be a flop.
Title: Re: Successful carb settings redeux
Post by: DanB on March 20, 2013, 05:41:36 pm
Updated 4 June 2013

Bike: AVL, 500 Electra.
Carb: BS-29 (CV carb by Ucal, Mikuni design & jets).
Filter: K&N DU-0100, in stock electra airbox, box drilled, and internal walls removed per this thread: http://www.enfieldmotorcycles.com/forum/index.php/topic,117.0.html (http://www.enfieldmotorcycles.com/forum/index.php/topic,117.0.html).
Exhaust:  Unrestricted short bottle; No cat. in pipe; No baffle
PAV: Removed and plugged at head.
Altitude: sea level, plus a couple hundred feet.

Pilot jet: 17.5 (Stock is 15) - VM22/210 (from Jets R US)
Main Jet: 117.5 115 (Stock is 110) - N102.221 (small - understand you can also use N100.604)
Needle Jet: 4DHL38.  Plastic washer, 2.45 mm thick, 8.2 mm OD, tight fit but moves, middle clip setting. 
Piston Valve (CV slide): Bored out the 2x vacuum openings by +1/16 inch.  Crisper response... doesn't appear to affect fuel/air ratios.  Does affect fuel consumption.

Performance notes: The carb pulls very nicely throughout the power band. Have to say, I'm impressed with its 'zippy ness'.  Have a bit of hesitation between 1/8 and 1/4 throttle.  Going to shim needle richer.  If that doesnt work, will remove .7 to .8 mm of slide piston (making it richer).

Update:  After plug checks, moved to a richer main jet.  I have both a 117.5 and a 120.  Using the 117.5 now as its warmer (60's to 70's);  Will use the 120 in the fall.  Starting:  Both hot and cold were difficult to kick start.  Learned to grab about 1/8 throttle on kicking, and now i get 1 kick starts.  I thinking the AVL likes more air at start or it could be a result of the enlarged holes in the piston, i dunno.  Generally, one is instructed not to touch the throttle on a CV carb; not true for my bike.  Also, the 17.5 pilot is almost too rich.  The mixture control screw is very sensitive and is currently working best between 1/2 and 1/4 turn out.  The bike didn't like 15 pilot; even at 6 turns out(!) it was starved & lean when rolling onto the throttle
Title: Re: Successful carb settings redeux
Post by: AVL Power! on March 24, 2013, 07:58:50 pm
This can be very helpful! I think every one of us should post our Carb Jetting specs here :)

-Sanket
Title: Re: Successful carb settings redeux
Post by: AVL Power! on April 02, 2013, 09:12:58 am
Here's my carb settings

Carb Name - Mikuni VM34
Carb type - Round Slide

Jets used -

30 size pilot jet (vm22/210)
220 size main jet (4/042)
6DH4 NEEDLE - Stock needle, that comes with the carb
159 N-8 - Needle Jet

Alterations & Minor mods - Free flow megaphone, Uni Airfilter (not oiled), PAV Removed, Cat-Con removed.

Altitude - 3000 FT

After this upgrade things changed! and the bike now offers better crispness throughout the rev range. Also, till now I have noticed no flat spots either. Mains running slightly rich, compared to pilot and needle (Needle on 4th slot, going to switch it back to 2nd).

Mileage - 25kmpl~28kmpl in city, 30kmpl~35kmpl in the highways.


Title: Re: Successful carb settings redeux
Post by: Arizoni on April 03, 2013, 12:30:38 am
Hopefully those numbers are Km/Ltr?
If they are they would be equal to around 65 miles/US gal city and 75 miles/US gal highway. :)

Title: Re: Successful carb settings redeux
Post by: AVL Power! on April 03, 2013, 05:58:01 am
Sorry for that! I fixed it :)
Title: Re: Successful carb settings redeux
Post by: mattsz on April 03, 2013, 03:17:33 pm
Sorry for that! I fixed it :)

I was gonna say... this is a thread for successful carb settings!   ;D ;D ;D
Title: Re: Successful carb settings redeux
Post by: DanB on May 10, 2013, 03:12:00 am
I copied this from bedlam and his Mikuni tm32 off the uk forum. An excellent read, photos and dyno graph. Hope you dont mind bedlam.

Link: http://tinytim.forumcircle.com/viewtopic.php?t=2631 (http://tinytim.forumcircle.com/viewtopic.php?t=2631)

"MAIN JET 4/042-Size 200 Note: VM jets are NOT the same as TM jets, and the sizes are calculated differently.
PILOT JET VM22/210-Size 30
NEEDLE JET 785-24001-Size (389) Q-2 (as supplied)
JET NEEDLE 5FP17 Clip groove #3 (as supplied)
STARTER JET VM17/1002-Size 60 (as supplied)

These are the settings I'm using at the moment. A minor improvement might be gained from raising the float height slightly from the stock position, but I haven't bothered. The slide is the one supplied with the carb. This particular main jet hasn't been checked on the dyno but it's almost certainly correct - maybe even one too rich. A 185 was too lean. It's very sensitive to pilot screw settings and is happier with the pilot set a bit rich because there's no accelerator pump. "
Title: Re: Successful carb settings redeux
Post by: D the D on June 03, 2013, 01:49:32 am
Settings I arrived at with help from Ace and everyone.
Bike: 2007 Iron Barrel 500 ES Military.
Carb: Mikuni VM28-418 (TM28 Flatslide)

Filter: K&N RU-2450 in stock airbox.
Exhaust: Baffled India short bottle (baffle in bottle like stock muffler, not added reducer type in pipe), India head pipe, no Cat, no PAV.
Altitude: ~280ft.

Pilot jet: 25 VM22/210
Main Jet: 180 VM4/042/180 (large hex)
Needle Jet: P-0
Needle: 2nd slot from bottom (richer side of middle)
Slide 2.5

Results: Good idle, good torque, crisp response and smooth through all ranges, great drivability, one kick starts in warm weather.  Vast improvement over Mikarb.  The smaller 28mm Flatslide seems to like one or two jets smaller than TM32 people are commonly using.  May restrict top end, but I don't know to what extent as I haven't exceeded 65mph via GPS reading (Speedometer reads ~5mph high at 60) and I generally don't exceed 55.  She'll cruise at 65 without effort, just don't want to punish the stock bottom end.
Title: Re: Successful carb settings redeux
Post by: ace.cafe on June 03, 2013, 11:49:14 am
Settings I arrived at with help from Ace and everyone.
Bike: 2007 Iron Barrel 500 ES Military.
Carb: Mikuni VM28-418 (TM28 Flatslide)

Filter: K&N RU-2450 in stock airbox.
Exhaust: Baffled India short bottle (baffle in bottle like stock muffler, not added reducer type in pipe), India head pipe, no Cat, no PAV.
Altitude: ~280ft.

Pilot jet: 25 VM22/210
Main Jet: 180 VM4/042/180 (large hex)
Needle Jet: P-0
Needle: 2nd slot from bottom (richer side of middle)
Slide 2.5

Results: Good idle, good torque, crisp response and smooth through all ranges, great drivability, one kick starts in warm weather.  Vast improvement over Mikarb.  The smaller 28mm Flatslide seems to like one or two jets smaller than TM32 people are commonly using.  May restrict top end, but I don't know to what extent as I haven't exceeded 65mph via GPS reading (Speedometer reads ~5mph high at 60) and I generally don't exceed 55.  She'll cruise at 65 without effort, just don't want to punish the stock bottom end.

Sounds good!
The reason for the smaller main jet on the 28 is that it is a smaller carb than the 32, so at full throttle it is not passing as much air as the 32.
The 28 does have enough flow capacity to flow as much as the typical stock Bullet head, but barely.
Title: Re: Successful carb settings redeux
Post by: D the D on June 04, 2013, 07:50:21 pm
The TM-28 is good for my putting around the area.  If I do anything more for better breathing/performance, I'll get a TM-32 and Ace Air Canister.
Title: Re: Successful carb settings redeux
Post by: jedaks on June 09, 2013, 12:43:33 am
Instead of always reading I'll contribute too.

Bike: 2004 Kick only 535
Carb: Factory Mikcarb VM28
Filter:  Ace Canister
Exhaust: "Goldstar" style
PAV: Removed and plugged at head.
Altitude: sea level

Pilot jet: 27.5, air screw 3 turns out from bottom.
Main Jet: 127.5
Needle Jet: Stock, clip on bottom (richest) setting
Piston: Accralite 535 (8.5:1) 150psi


Performance notes: It took a while to dial everything in, due to living in the middle of nowhere and having heaps of information to digest. However once I got everything to co-operate the bike pulls like a team of mules with no ping at any throttle opening and a steady reliable idle. Engine starts on 1st or 2nd kick. I'm probably running a little bit rich, but this combination of jets gives the best power, performance and fuel economy. (24 kilometers per litre) I also always use premium fuel 98 octane (93 in US me thinks).
Title: Re: Successful carb settings redeux
Post by: D the D on August 30, 2013, 02:52:56 am
Bike: 07 Iron Barrel
Carb: Mikuni TM32
Filter: Ace Canister
Exhaust: Indian Headpipe and Indian Short Bottle
PAV: Gone
Altitude: ~ 180 ft according to FAA

Pilot Jet: 30 1.5 turns on the Pilot Screw (+ or - 1/8 turn)
Main Jet: 190
Needle Valve: P-4
Needle: 5FP17 (Stock Needle) Clip in the middle
Throttle Valve: 4.0 (Stock Throttle Valve)

Easy kick starts.  Don't need Choke when it's in the 80's F.  Could probably drop the needle a notch, but would probably have to raise it back when the weather cools.  I run out of motor's ability to breath before the carb can restrict it now, but WOT doesn't bog from being too big either.  Don't need as much throttle to maintain the same speeds as the TM28 or VM28 did.
Title: Re: Successful carb settings redeux
Post by: TejK on October 31, 2013, 07:07:04 am
Bike: 2008 AVL 500, BW piston mod to bump compression, Mildly ported Head (smooth'd down the steps on short radius)
Carb: Mikuni TM34
Air Filter: K&N R-1100, No PAV etc
Exhaust: Short bottle with straight thru Removable Baffle, Original Header pipe with Hot tube removed
Altitude: 2950 ft~3000 ft
Temperatures: 24-33 Deg C around the year

Pilot Jet: 25,  2 turns out (+/- 1/4 turn)
Main Jet: 210
Needle Jet: 389-Q2 (Stock)
Needle: 6DP17 (in lowest position)
Throttle Valve: 4.0 (stock)

Easy starts in the morning, Needs choke on cold mornings but not during the day. Accelerates pretty strong all the way to 135 Kmph ( Radon Digital meter readout). Can potter around at 40Kmph in top gear and pulls away cleanly with light throttle.

The plug pic attached. Checked after 400 kms of installing the carb with the new needle.
Title: Re: Successful carb settings redeux
Post by: REpozer on April 26, 2016, 06:48:22 pm
Bike:2008 AVL Classic Bullet 500
Carb: BS-29
Air Filter: Stock paper in tool box
Pav removed and plugged
Catch cup removed, with added beather tube and duck bill
Exhaust : Stock header with removed hot pipe, long India after market muffler exhaust ( glass pack)
Main Jet: 115
Pilot Jet: 17.5
Needle : Stock setting
Air/Mix screw approx. 2.5 turns counter clock wise ( out)

Starts well, engine more crisp, can lift the front end a few inches during acceleration in first gear.  An occasional pop during hard deceleration.
Title: Re: Successful carb settings redeux
Post by: strat71 on August 15, 2016, 09:56:36 pm
Bike: 03 Iron Barrel
Carb: Mikuni TM32
Filter: Ace Canister
Exhaust: Indian Headpipe and English Short Bottle
PAV: Gone
Altitude: from sea level to ~140m
Temperature: from 26 to 32°C
Pilot Jet: 25 - 1 and 3/8 turns out on the Pilot Screw (+ or - 1/8 turn)
Main Jet: 185
Needle Valve: P-4
Needle: 5FP17 (Stock Needle) Clip in the 3rd position from bottom + half shim (I.e. 2.5 position from bottom))
Throttle Valve: 4.0 (Stock Throttle Valve)

Note: i spent time finding the right jet combination, unsuccessfully, but it turned that the spark was weak. i fixed the ignition and since, it's been very easy to find the right setting... the bike starts very easily with the Kickstart, the idle is smooth, the bike pulls nicely when you need power... turns like a swiss clock..
Title: Re: Successful carb settings redeux
Post by: Mandar_C500 on November 02, 2016, 11:51:52 am
Hi,
     I have a query regarding Jetting and Niddle setting.
I own a classic 500 (EFI model) I have removed EFI system and installed a CARB (UCAL33 / BS33) which comes with UCE 500 carb model in India.
I have installed a UNI foam filter and raised the needle by adding a small spacer, however not changed the jets.
Do I need to change the Jets, if yes then pilot or main jet or both?
Is raising the needle is same as up-sizing the main jet?
I have not checked the plug color however bike has a flat spot at 80 KMPH.

Have not check spark plug yet
Regards
Mandar
Title: Re: Successful carb settings redeux
Post by: heloego on April 29, 2017, 03:29:30 pm
   Well I think I finally dialed it in!  ;D

   '06 Electra X
   Mikuni VM32 (Round Slide)
   Goldstar Exhaust
   Same paper Air filter ACE supplies with his Canister with re-purposed Triumph Fork Gaiter as manifold.
   Average Altitude: 5500ft/1.7km
   Current Average Temps: 65F/18-19C
   
   Pilot/Air Screw Out: 3/4t
   Pilot Jet: 30
   Needle Jet: 159P6
   Needle: 6DH2, Clip in Slot #3 (middle)
   Main Jet: 170

   EDIT: Also keeping #s 165 and 175 Mains neatly packed in the tool bag for those trips to other altitudes.  :)

   Plug looks good, snappy response and no dead spots in all throttle ranges.
   Pulls very nicely across the board and uphill.
   Opening to Full at 75mph/120kmh gives me a nice smooth boost, but the front end gets wobbly so I haven't explored the full potential yet.
   
   
Title: Re: Successful carb settings redeux
Post by: DanB on April 29, 2017, 09:16:41 pm
Hey heloego

Didn't you out in a P6 needle jet in place of the Q6?
Title: Re: Successful carb settings redeux
Post by: heloego on April 30, 2017, 01:22:58 pm
Absolutely right!  :-[
Above post edited to correct jet.  :)
Title: Re: Successful carb settings redeux
Post by: creaky on May 08, 2017, 12:24:19 am
Heloego, Your post sounds the closest to my bike so maybe you can help me here? Iron barrel 2006 Classic with standard muffler. Recently bought Mikuni VM32 and is now jetted as follows.
Pilot 30
Main 180
Needle 6DP17
Needle jet Q6
Clip in middle slot
Slide is 3 (standard)
It has a POD filter
Runs ok but I feel it could go better. I don't want a loud muffler hence the stock one. Recommend a free flow muffler that is not too loud if you can. I have experimented with a main from 150 to 250 and a pilot from 25 to 35. The only time I got it running any good at all was when I replaced the recommended 6F05 needle jet with the 6DP17 which was on the carby as delivered. I started a post on O2 gauges which I have temporarily fitted but no matter what jetting I use it tells me it is too rich even though the plug looks ok.
Title: Re: Successful carb settings redeux
Post by: ace.cafe on May 08, 2017, 01:54:26 pm
Needle jet is way too rich.
Try P4 or P6 needle jet.
Title: Re: Successful carb settings redeux
Post by: creaky on May 11, 2017, 10:56:09 am
Ace, When I bought the carby it had the following:slide 3, main jet 200, pilot 35, needle 6DP17 and needle jet Q6. The recommended jets I bought with it were:mains 230,240,250, pilot 30, needle 6F05 and needle jet P5. With the recommended jets etc it ran so badly I had to experiment and finally found the needle jet P5 was the problem. With the Q6 installed just about any combination of the others worked OK but the best is main 180, pilot 30 or 27.5, needle 6DP17 and jet Q6. Needle in second richest slot. I have a temporary oxygen sensor installed which now tells me the mixture is correct through the whole range. What has me stuffed though is I don't notice much difference on WOT with a 150 or a 250 main jet.
Title: Re: Successful carb settings redeux
Post by: ace.cafe on May 11, 2017, 12:10:18 pm
Maybe they changed the numbering on the VM needle jets? I have never seen a Mikuni P5 needle jet number. They are all even numbered jets in all the listing that I have seen.

All the ones we use on the TM32 are the same as yours, except we use P4 or P6 needle jets. At least 75 bikes out there running great with that combination.

If it runs well with the Q6, then leave it. The TM 32 comes with a Q6, and we have to take it out.

I don't know why you see no differences in performance of widely differing main jets. This is not typical. Maybe do some plug chops.
Title: Re: Successful carb settings redeux
Post by: heloego on May 12, 2017, 06:15:41 pm
   Sorry for a delayed response. Real life issues always take precedence.  ::)

   Ace:

   Yes, the VM series do have odd numbered Needle Jets. I had considered going from a Q6 to a Q5 until you advised the P6. Glad I took your advice!  ;D

   creaky:
   Close is kinda like hand grenades when you compare an IB 500 with stock exhaust to an AVL 500 with free flowing. I think the stock 2006 IB has the coated header with a 2-stage Cat in the silencer, correct? Or maybe it was only the case with the AVL. Dunno.
   I could only make suggestions in this case, but this worked for me, so if anyone else feels like correcting or confirming anything I say please, please, please feel free to do so. I will not be offended since this has been (and will continue to be) a learning process for me, too.

   This helped me a lot, as it gave me a map to follow. You may already have this, but maybe someone else can use it, too:
      http://www.mikuni.com/pdf/vmmanual.pdf (http://www.mikuni.com/pdf/vmmanual.pdf)
   I highly recommend downloading and printing it.
   Page 14 is a good Troubleshooting section to determine Lean or Rich performance conditions.
   The last page shows the throttle settings on the left and which Needles/Jets come into play at the various throttle settings on the right.
   I don't know what assumptions Mikuni makes regarding breathing on the Main Jet Tuning Calculator but it worked for me with the Goldstar system. I ordered up a Main Jet Kit (4/042 series with #70-#230 main jets) from jetsrus.com and it came with a calculator, but the calculator alone is also available cheap all over e-bay.
   
   Ensure your Air Filter is CLEAN! Accumulated dirt or over-oiling will definitely degrade performance. This is even more important with restricted breathing such as with a stock exhaust. If your filter is dirty or over-oiled and you start messing with your jetting, changing to a clean filter later could just give you a leaner condition and may require re-jetting.
   Ensure there are no air leaks on the intake side. Any crack or bad seal will automatically make for a lean condition and reduce performance.
   You say it "runs OK now, but could go better". Is acceleration poor across settings? Maybe go richer on the Jet Needle a slot? Mines set at #3 position (middle) and runs well. Any slot adjustment (Fuel Ratio) IMHO is the very last step you'd need to do, especially if performance suffers at all settings.
   Do plug chops for each throttle setting. At idle with no load, and at all settings under load. That will tell you more than an O2 gage whether you need to go leaner or richer with that particular needle or jet. A gage can be out of calibration and give an erroneous indication. Plug Chops don't lie.

   As for a silencer recommendation, I'm using a Short Reverse Megaphone on the UCE and a Goldstar System on the AVL. The Goldstar system doesn't strike me as particularly loud compared to the Reverse Meg.
   
   
     
   
     
 
Title: Re: Successful carb settings redeux
Post by: creaky on May 14, 2017, 10:57:28 am
Heloego: Yes it has a stock engine pipe but I cut out the Cat thingo which was a lumpy thing at the muffler end of the pipe. I have had the Goldstar muffler recommended by a few people so I might go down that track. Just don't want it too loud. I did a plug chop at around 3/4 throttle and the plug looked good. And re the O2 gauge it was giving me false readings because I had not connected its heater wires which I was told was unnecessary. However they are required to get the sensor to the correct temperature. Now it shows I am running a near perfect mixture at all throttle opening except a bit rich on idle even though I have changed to a 27.5 idle jet. May try a 25 which I have somewhere.
Title: Re: Successful carb settings redeux
Post by: heloego on May 14, 2017, 01:01:57 pm
   Happy Days!
   A guy at a local shop advised me that if you run too rich at idle and have to turn your air screw out as much as 2 3/4 turns it's advisable to go to the next smaller pilot jet. The 27.5 might just be the ticket. Just remember once you've reached your fastest rpm with the screw to turn it back in about 1/4 turn so you don't idle too lean.
   Glad to hear you've sorted everything!  ;D
Title: Re: Successful carb settings redeux
Post by: Yamahawk on June 26, 2017, 09:15:15 pm
OK! Finally got the carb settings ironed out for my bike, so here they are!

BIKE: 1996 Royal Enfield Bullet 500 Iron Barrel with stock bottle muffler.
CARB: Mikuni VM34
MAIN JET: 200
NEEDLE JET: P6
PILOT JET: 25 and 1 to 1.25 turns out
NEEDLE: Stock needle on groove 4 from top (next to full rich)
AIR FILTER: K&N clamped on the carb bell

After trying several combinations of needle jets, main jets, and needle clip settings, this is what I settled on. Initially, I tried a P8 needle jet, and a 210 main, needle on 4th clip from top, and it ran really strong but the plug was black and sooty. I was running a B7ES plug, which is hotter than the stock plug, so I knew it was pretty rich. Then I went to a 200 main, needle in the middle clip, and a P6 Needle jet. It didn't pull as strong, but ran well. So, I put a couple hundred miles like that, and the plug seemed a little too white, and so I installed a BR8ES I had laying around, and also put the needle clip in the 4th position. Now, it pulls very strong, and the plug has a brown color. I think I will run it like this for a while, then check the plug again.
Title: Re: Successful carb settings redeux
Post by: Dave1 on June 30, 2019, 04:56:07 pm
Well here are my successful carb settings. Bike is Royal Enfield Iron Barrel 520 cc, 9.6:1 compression, Bullet Whisper ASBO19. Gas flow and ported head, standard valves, K&N air filter, trials exhaust. Not going to mention all the modifications as not all of them are needed here.

Carburettor : Mikuni TM32
Main Jet : 210 Hex jet ( 4/042 )
Needle Jet : P4 ( 389 )
Pilot jet : 27.5 ( VM22/210 )
Needle : 5FP17 ( 3rd groove from the top )
Slide : 4.0

This is the latest settings as of today. Air temperature is 22 degrees Celsius, 60% humidity. 167 feet above sea level. Bike pulls well all through the rev range to 70mph indicated.
 
                 
Title: Re: Successful carb settings redeux
Post by: Royal Stargazer on August 15, 2019, 11:58:46 pm
I was so excited to finally post here after getting my carb all dialed in, but held off because the thread had been dormant for awhile, but now that's not an obstacle anymore...

The bike is a 2003 Bullet 500, bored out to 535cc with an 8.5:1 piston, Mikuni VM32 carb, K&N filter, and free-flowing '50s-style exhaust, no baffle (the tone is wonderful, maybe a bit louder than I would have otherwise preferred.) I've also removed my oil catch can.

Pilot: 27.5
Main: 210
Needle: 6DH2, fifth position (rich)
Slide: 3.0
Air screw out 1-1/4 turns

I have no idea what my air jet or needle jet are.

At 850 - 900 ft above sea level, mid 60s to mid 70s F with low humidity, the bike runs like a charm. It was still a little on the lean side (especially at WOT) when temperatures were in the mid to upper 80s, so I can tell next summer or a particularly intense Indian summer will call for me to swap in a 220 main, and maybe that 6DH4 I've been sitting on.
Title: Re: Successful carb settings redeux
Post by: Bilgemaster on August 16, 2019, 03:08:38 am
This is a potentially very useful thread. Parsed by carb type it might one day make for a handy reference database of best proven practices. Shame the old thread got lost in the shuffle.

Just as a sort of baseline, I wonder if someone could provide the stock Mikcarb VM28 and other carbs' factory setup(s) through the years with the stock exhausts, both with and before the Air Pulse Valve, "Catalytic" Tube, and so forth were added.
Title: Re: Successful carb settings redeux
Post by: tooseevee on August 16, 2019, 05:32:26 pm
Needle jet is way too rich.
Try P4 or P6 needle jet.

           Which person and which carb is this a Reply to? ???(http://)
Title: Re: Successful carb settings redeux
Post by: Adrian II on August 17, 2019, 03:23:15 pm
This one, tooseevee!

Heloego, Your post sounds the closest to my bike so maybe you can help me here? Iron barrel 2006 Classic with standard muffler. Recently bought Mikuni VM32 and is now jetted as follows.
Pilot 30
Main 180
Needle 6DP17
Needle jet Q6
Clip in middle slot
Slide is 3 (standard)
It has a POD filter
Runs ok but I feel it could go better. I don't want a loud muffler hence the stock one. Recommend a free flow muffler that is not too loud if you can. I have experimented with a main from 150 to 250 and a pilot from 25 to 35. The only time I got it running any good at all was when I replaced the recommended 6F05 needle jet with the 6DP17 which was on the carby as delivered. I started a post on O2 gauges which I have temporarily fitted but no matter what jetting I use it tells me it is too rich even though the plug looks ok.
Title: Re: Successful carb settings redeux
Post by: tooseevee on August 17, 2019, 04:00:08 pm
This one, tooseevee!

      Ah! Danka.
      If VM not TM then Ignore.

      Sleep.
Title: Re: Successful carb settings redeux
Post by: Adrian II on August 18, 2019, 12:52:14 pm
Still good carbs, though. The TMs are taller, which can occasionally lead to under-tank clearance issues, especially with the accelerator-pump versions. This one might have gone a wee bit too big.
Title: Re: Successful carb settings redeux
Post by: tooseevee on August 18, 2019, 09:27:33 pm
Still good carbs, though. The TMs are taller, which can occasionally lead to under-tank clearance issues, especially with the accelerator-pump versions. This one might have gone a wee bit too big.

           I wasn't dissing VMs.

            I commented that only because a TM is what I have on the bike so I is disinnerested in VMs.

           
Title: Re: Successful carb settings redeux
Post by: Adrian II on August 19, 2019, 02:44:51 pm
No dissing was read into your post, tooseevee!  :) I had good results with a TM36-31 pumper carb on my old Electra-X (still got that carb!) as well as a VM32 on an old BSA of mine years ago.

Ace did a lot of work with the TM32-1 on the Fireball Bullets, and it has proved to a good choice for AVL as well as cast iron. I suspect the TM in the picture I posted was nearer a TM38...

A.
Title: Re: Successful carb settings redeux
Post by: heloego on August 21, 2019, 10:51:55 pm
I've a VM32 tuned for 6=7000 altitude.Love what it did for performance with a polished exhaust port and free-flow exhaust. I like the looks, too.

Only issue I keep having is the slide is finicky. Have to keep adjusting the idle up or down at stops.
It's not the cable. I keep it lubed regularly, and the slide with engine off doesn't stick at all. Tried lubing the slide with Teflon, but that didn't help.

Any suggestions?
Title: Re: Successful carb settings redeux
Post by: tooseevee on August 22, 2019, 12:08:12 am
I've a VM32 tuned for 6=7000 altitude.Love what it did for performance with a polished exhaust port and free-flow exhaust. I like the looks, too.

Only issue I keep having is the slide is finicky. Have to keep adjusting the idle up or down at stops.
It's not the cable. I keep it lubed regularly, and the slide with engine off doesn't stick at all. Tried lubing the slide with Teflon, but that didn't help.

Any suggestions?

            Do you put a little Magical Mysterious Oil in your gasoline, petrol, benzine, whatever? I wonder if that might help??

            Cue Bilgemaster. He'll give you all the formulas (formulae?)  :) :)(http://)
Title: Re: Successful carb settings redeux
Post by: heloego on August 22, 2019, 01:25:08 am
LOL. Got a bottle of MMO in the garage for awhile now. Forgot I even had it!  :o
I'll give it a try this weekend and see if it helps.
Thanks for the suggestion!  ;D
Title: Re: Successful carb settings redeux
Post by: tooseevee on August 22, 2019, 12:46:22 pm
LOL. Got a bottle of MMO in the garage for awhile now. Forgot I even had it!  :o
I'll give it a try this weekend and see if it helps.
Thanks for the suggestion!  ;D

        I've found that just barely an ounce per two gallons seems to be OK. Keep an eye on your plug. It will tell you if you're using too much. Back in the '50s and '60s we all used what was then called top oil. Then we got unleaded gas and it was absolutely necessary for engines not yet built (or rebuilt) for it. I remember the first shovel I had the heads "built" on for unleaded. The total rebuild of each head was $500 each. The work was similar to what Ace did to my '08 AVL head. They were freaking gorgeous  ;D ;D
Title: Re: Successful carb settings redeux
Post by: Richard230 on August 22, 2019, 02:18:18 pm
        I've found that just barely an ounce per two gallons seems to be OK. Keep an eye on your plug. It will tell you if you're using too much. Back in the '50s and '60s we all used what was then called top oil. Then we got unleaded gas and it was absolutely necessary for engines not yet built (or rebuilt) for it. I remember the first shovel I had the heads "built" on for unleaded. The total rebuild of each head was $500 each. The work was similar to what Ace did to my '08 AVL head. They were freaking gorgeous  ;D ;D

I hate to say it, but I am still using "top cylinder" oil in the gas of my RE.  Seems appropriate, somehow. But now it is called by other names, such as fuel cleaner and combustion improver.  ::)
Title: Re: Successful carb settings redeux
Post by: tooseevee on August 22, 2019, 05:47:34 pm
I hate to say it, but I am still using "top cylinder" oil in the gas of my RE.  Seems appropriate, somehow. But now it is called by other names, such as fuel cleaner and combustion improver.  ::)

        But aren't most of those (not all) mostly just alcohol? I don't know myself. I don't buy much "bottled stuff for engines and gullible people". Whereas Magical Mysterious Oil is actually an "oil".

         I used to see a lot of "octane boosters" on the shelves also. I think they mostly boosted the profits of the auto store.
Title: Re: Successful carb settings redeux
Post by: Richard230 on August 22, 2019, 09:33:31 pm
        But aren't most of those (not all) mostly just alcohol? I don't know myself. I don't buy much "bottled stuff for engines and gullible people". Whereas Magical Mysterious Oil is actually an "oil".

         I used to see a lot of "octane boosters" on the shelves also. I think they mostly boosted the profits of the auto store.

I suspect that top cylinder oil and the like are just repackaged kerosene. Of course, I also believe the Marvel Mystery Oil is likely kerosene, too. But you do get a lot more of the stuff for your money.  ::)
Title: Re: Successful carb settings redeux
Post by: Arizoni on August 22, 2019, 11:45:51 pm
I suspect that top cylinder oil and the like are just repackaged kerosene. Of course, I also believe the Marvel Mystery Oil is likely kerosene, too. But you do get a lot more of the stuff for your money.  ::)
Nope.
Marvel Mystery Oil doesn't smell like kerosene or coal oil and it won't light with a match like either of these fuels will.
Given enough time and heat it will burn but it burns like a light weight motor oil.

I know these things because I just tested it. :)
Title: Re: Successful carb settings redeux
Post by: Northern Munkey on March 05, 2020, 03:45:26 am
Help please, trying to dial in a old model TM-32 and I'm really struggling. I have a successful pilot jet @27.5 with 1.5 turns, however I'm using a P4 needle jet with 5FP17 needle (clip in middle). No matter which main jet I run VM type 175-205 or hex type 170- 190 I can't get above half throttle without total loss of power.the best it ran to nearly full was with the 180 hex , but the pug was very lean. Checked floats, electrics are all good. On running the standard VM28 I have no problems going to full throttle (but I run out of carb for my engine)

Bike is '07 Iron Barrel 500, 0.20 overbore, hot tube removed, short bottle and intake enlarged to 32mm & polished exhaust
Title: Re: Successful carb settings redeux
Post by: Itone19 on September 04, 2020, 01:16:55 pm
Hi. I have a 1967 Royal Enfield 350 bullet. It has a 6/26R wassell carb fitted. Very poor starter. Have to flood it out before it even wants to try. Anyone got any settings for this which may be of use.
Thank you itone19