[Jerbunch]

Hi guys, has anybody out there with a classic 350 experienced a very brief hesitation after shifting to fifth at around 50-55 miles an hour while accelerating? The problem I have is with my 500 mile classic 350 and I experience occasional hesitation at 52 miles an hour or so. No engine light.  The hesitation in acceleration would best be described like a very small air bubble going through the efi. Is there a fix for this?

[3oro]

Yes, it seems to stall at high speed. Clean the fuel pump relay of grease and use contact spray. Also clean the fuses with contact spray. The relays are in a metal box under the sic on the right. Do not use fuels that are sold at the pumps as additives, the motorcycle sometimes reacts badly to them, especially if it has been standing for a long time

[ptclassic]

Yes, it seems to stall at high speed. Clean the fuel pump relay of grease and use contact spray. Also clean the fuses with contact spray. The relays are in a metal box under the sic on the right. Do not use fuels that are sold at the pumps as additives, the motorcycle sometimes reacts badly to them, especially if it has been standing for a long time

So you are saying that premium gasoline is not good for the  classic?

I usually put premium because o don't have much time to ride and the gasoline stays one or two months there and I thought that was better to use premium


I was also thinking of buying a fuel additives because of that

[Curious wanderer]

No problem with that at all, and no problem in the UK with either 95 or 98 octane fuel. If it’s occasionally missing, I’d check something simple like the spark plug cap is on tight.
In nearly 6000 miles in all weathers and temperatures mine’s been fine.

[3oro]

In my experience, you should use quality fuel without additives. 95, 98, 100. Additive fuels are specially advertised at the pumps.

[3oro]

If the motorcycle is standing for several months, it is best to add 0.5% 2t full synthetic oil for off road engines to the tank, preferably Motul compatible with a catalyst. Oil stops corrosion in the entire system. This is especially true for carburetor motorcycles

[hotrob]

The problem I have is with my 500 mile classic 350 and I experience occasional hesitation at 52 miles an hour or so. No engine light.

I had a similar problem with my old Bullet Classic EFI, and I think it happened once on my Meteor back in the summer.  On the Bullet I think it was a known problem caused by the sidestand switch.  When riding over bumps the stand could move enough for the switch to briefly cut the ignition.  Fixes could include fitting a stronger spring on the sidestand or disconnecting the switch.

[Dexter]

So you are saying that premium gasoline is not good for the  classic?

I usually put premium because o don't have much time to ride and the gasoline stays one or two months there and I thought that was better to use premium


I was also thinking of buying a fuel additives because of that

There is no harm to your engine using premium fuel, when it is not required. The only harm is to your wallet. Premium fuel, if it contains no ethanol, will last up to 6 months before it begins to degrade. Ethanol laced fuel is typically good for up to 3 months before degradation begins, because of the water content of the ethanol.

In your case, I would not worry about using either premium, or fuel stabilizers, since you appear to use the bike more often than every 3 months.

In the case of owners who store their bikes over a stretch of winter, maybe 5 or 6 months, running the tank near empty on a final ride and then filling up with a non ethanol premium fuel would be a good idea, or, fill up with your usual ethanol grade fuel and use a fuel stabilizer.

I prefer the no ethanol premium fill up over the 6 months my bike is usually sitting, just to be sure no water can separate out of the regular ethanol blend to cause rust in the fuel tank.

[ButteMT]

Using Premium is only wasting money for the most part - higher octane is for higher compression motors, generally speaking.
Don't put oil in your fuel, use something like Sta-Bil fuel stabilizer for long jaunts in storage.
Keep the battery on a trickle-charger as well.

My 2¢

[ptclassic]

In Portugal, premium gasoline (95) will be +0.05€/l

So, for me that last time I put gasoline was in November...an extra 0.5€ in a full tank..

[Leofric]

Using Premium is only wasting money for the most part - higher octane is for higher compression motors, generally speaking.
Don't put oil in your fuel, use something like Sta-Bil fuel stabilizer for long jaunts in storage.
Keep the battery on a trickle-charger as well.

My 2¢

Except higher octane fuel,at least here, contains less ethanol !

[Leofric]

Yes, it seems to stall at high speed. Clean the fuel pump relay of grease and use contact spray. Also clean the fuses with contact spray. The relays are in a metal box under the sic on the right. Do not use fuels that are sold at the pumps as additives, the motorcycle sometimes reacts badly to them, especially if it has been standing for a long time

On a bike that has only done 500 miles !

[3oro]

Yes sir. It started on my motorcycle before the first service at 500km

[Leofric]

What are fuels that are sold at the pumps as additives ? We have E10 and E5 grade petrol here. E5 is higher octane with lower ethanol content. There are additives like fuel injector cleaner you can buy to add to the tank,but it isn't sold at the pumps.

[Dexter]

What are fuels that are sold at the pumps as additives ? We have E10 and E5 grade petrol here. E5 is higher octane with lower ethanol content. There are additives like fuel injector cleaner you can buy to add to the tank,but it isn't sold at the pumps.

3oro lives in Serbia, so who knows what kind of differences we might find at fuel stations at various places around the world.

This is another example of how having a member's location visible right in the avatar - not just on the profile page - would be most helpful to everyone on this forum. How many times have I seen members asking another where they live?  Let's KISS, people!