1992 CB250 Hesitates on slow acceleration

The bike: 1992 Honda CB250 Nighthawk.

The Problem: When applying the throttle slowly the engine hesitates.
This is more noticeable when the engine is cold and operating at lower
rpm range. Keeping the choke on for a longer period of time minimizes
the problem. This problem is still present when the engine is fully
warmed though not as dramatic. Moderate to fast acceleration seems
normal and the bike holds highway speed normally.

Is there a specific area of the carb I should focus on?

This condition came on suddenly last week, before that the bike ran
fine.

Any advice will be greatly appreciated.

Thanks
Carl

 

I have the same bike and had the same problem. Two bottles of Techron
and 700 miles fixed it. Maybe B-12 would work better, but make sure you
add enough. I had tried a few ounces of B-12 in the tank and it didn't
make any difference.


--
Neil T. Dantam


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Albrecht via MotorcycleKB.com wrote:
....

I'm not a chemist, but that makes sense to me. If the B12 dissolves
hard stuff, it sort of makes sense to me that it would dissolve
lubricating oil. I'm guessing that the low rpm advice is to minimize
the amount of intake per piston stroke. Does that make layman's sense?

p