Unofficial Royal Enfield Community Forum

Royal Enfield Motorcycles => Bullet Iron Barrel => Topic started by: gemini641 on September 07, 2007, 03:32:58 am

Title: Wierd carb problem
Post by: gemini641 on September 07, 2007, 03:32:58 am
Just got the '05 Bullet Deluxe on the road again after busting the Sprag clutch from backfires. Finally got the timing just right and pretty good tune on the carburettor but it's doing something funny.

When I crack the throttle open and let it off, instead of immediately dropping back down to idle, she continues to "race" and very, very slowly drops back to idle. I noticed when I was riding today it was almost like power shifting, which I don't do.

The throttle cable run is free and  I can hear and see  the throttle block "clunk" home when I let go of the twist grip so it ain't the cable. Maybe in one of the internal circuuits in the carb?

Anybody got any suggestions? Going to work on it tomorrow and see what I come up with.

Tom
Title: Re: Wierd carb problem
Post by: dogbone on September 07, 2007, 02:10:13 pm
Look for a vaccum leak, the rubber mounting flange cracks, replace it with the lucas part,they last much longer. It could also be intake valve too tight.
Title: Re: Wierd carb problem
Post by: gapl53 on September 07, 2007, 03:15:45 pm
Isn't that an oxymoron saying Lucas parts and lasting longer in the same sentence?
Title: Re: Wierd carb problem
Post by: dogbone on September 07, 2007, 09:28:28 pm
GAP 53    The worst part is the overall q of the oem part!!!  Maybe they are outsoursing from China to India   ::)
Title: Re: Wierd carb problem
Post by: dewjantim on September 07, 2007, 10:48:41 pm
Look for a vaccum leak, the rubber mounting flange cracks, replace it with the lucas part,they last much longer. It could also be intake valve too tight.
Yep, Dogbone is probably right, vacume leak, or valves too tight.......Dew.
Title: Re: Wierd carb problem
Post by: gapl53 on September 08, 2007, 03:58:48 pm
GAP 53    The worst part is the overall q of the OEM part!!!  Maybe they are outsoursing from China to India   ::)
If they are outsourcing the quality has got to be better. I'm basing my experience on British cars and motorcycles from the 1950's and 60's. Lucas electronics were a nightmare and as backwards as they came.
Title: Re: Wierd carb problem
Post by: gemini641 on September 08, 2007, 04:42:17 pm
Well, vacuum leak seems to be the consensus, even Tait said the same thing right off the back.

Have the Amal intake rubber and it seems sound, no cracks. I tightened it down pretty good. And I double checked  the intake hole for the PAV system which I had previously removed. No leak there.

It is running a  better but I'll check the intake valve today and see what's what.

Thanks, guys, I'll report when I find the problem. Meanwhile I'm going for a ride on this beautiful sunny day in Tidewater.

Tom
Title: Re: Wierd carb problem
Post by: gemini641 on September 08, 2007, 04:51:13 pm
Thanks, Blltrdr,

Will continue to tweak the carb sisnce I can't seem to find any air leaks.

Tom
Title: Re: Wierd carb problem
Post by: DaveG297 on September 10, 2007, 01:02:03 am
U can spray some WD50 around the carb manifold and watch the exhaust....if it smokes a little you have a vaccuum leak.   My bike had had two cracked intake rubber replaced.   Now I keep a roll of sticky rubber tape in the side cover just to patch things up if need be....dg
Title: Re: Wierd carb problem
Post by: gapl53 on September 10, 2007, 04:38:41 pm
U can spray some WD50 around the carb manifold and watch the exhaust....if it smokes a little you have a vaccuum leak.   My bike had had two cracked intake rubber replaced.   Now I keep a roll of sticky rubber tape in the side cover just to patch things up if need be....dg

I believes he means WD40.

You will also hear the engine pickup rpm when the vacuum leak is sprayed.

We use it to start engines insteed of ether due to the lubricating factors. Works about as well too!

WD40 is that wonder liquid that no workshop should be without, it has many diversified applications.
Title: Re: Wierd carb problem
Post by: Leonard on September 10, 2007, 07:23:17 pm
WD40 is that wonder liquid that no workshop should be without, it has many diversified applications.

If it is suppose to move and doesn't use WD-40.  If it isn't suppose to move and does, use duct tape.

Title: Re: Wierd carb problem
Post by: baird4444 on September 11, 2007, 01:35:33 pm
 
[/quote]

I believes he means WD40.
You will also hear the engine pickup rpm when the vacuum leak is sprayed.
We use it to start engines insteed of ether due to the lubricating factors. Works about as well too! WD40 is that wonder liquid that no workshop should be without, it has many diversified applications.
[/quote]

Yes it is handy stuff to have around BUT....
It is not a very good lubicant for metal. Get you some
"PB Blaster"  for rusted, corroded, and stuck fasteners!!
You will love it.
    - MIke
Title: Re: Wierd carb problem
Post by: gapl53 on September 11, 2007, 04:04:52 pm
WD40 is that wonder liquid that no workshop should be without, it has many diversified applications.

If it is suppose to move and doesn't use WD-40.  If it isn't suppose to move and does, use duct tape.


ABSOLUTLY!


Is Red Green your hero too! He's mine.
Title: Re: Wierd carb problem
Post by: VMAX on September 11, 2007, 09:48:22 pm
Red Green is good, but I like Harold. He has about as much mechanical insight as I do. Sad but true!
Title: Re: Wierd carb problem
Post by: DaveG297 on September 13, 2007, 03:08:51 am
WD 50,,,,,wonder where I was when I wrote that.   Maybe its the new improved stuff..ha
Title: Re: Wierd carb problem
Post by: HMR on September 18, 2007, 08:27:24 am
The pilot jet may be too big... I think the Mikarb come with a 25 Pilot jet

HMR
Title: Re: Wierd carb problem
Post by: gapl53 on September 18, 2007, 05:30:00 pm
WD40 is that wonder liquid that no workshop should be without, it has many diversified applications.

If it is suppose to move and doesn't use WD-40.  If it isn't suppose to move and does, use duct tape.


ABSOLUTLY!


Is Red Green your hero too! He's mine.
Red Green is good, but I like Harold. He has about as much mechanical insight as I do. Sad but true!
Vmax it looks like only us Northern Wisconsin guys watch The Red Green Show. That's too bad. I pick up so many good tips from the show, besides being something I can relate too. Kinda reminds me of the neighborhood I live in. Home Sweet Home! At least his workshop looks like mine does!
Title: Re: Wierd carb problem
Post by: Sam on September 18, 2007, 05:45:49 pm
Isn't he the guy with the toolbox entirely fillled with duct tape?
Title: Re: Wierd carb problem
Post by: gapl53 on September 19, 2007, 10:05:59 pm
Not true! There's bailing wire in the bottom too.
Title: Re: Wierd carb problem
Post by: gapl53 on September 19, 2007, 10:09:07 pm
I almost forgot about his supply of rubber inner tubes that he relies on all the time!