At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
If you've rebuilt and adjusted the carbs to the correct spec, and the air fuel mixture is right, it would be worth checking the fuel filter if one is present, as well the fuel pump (again, if present). These are typically the first place to look when you idle fine but die out on throttle.
As for the belt light, it depends on what it indicates. Wear? Tension? If the belt slips, or is too tight or too loose, it could also cause stalling under throttle. With the engine off and cool, check it for cracks, splits and wear, and give it a light tug with two fingers. It should have a small amount of play, but not enough to feel like you could pull it off. If it feels like a steel rod, it may be over tight.
If all of these things are fine, no clogged filters, etc, it's maybe time to look at the distributor, and recheck those carbs.
check compressions 100psi or more on all cyls ! carbs balanced ? sparks on all cyls ? crank seals could be worn ! tick over 1000rpm then in gear 800rpm ish ! In water !
1. The accelerator pump in the carb is clogged, the linkage is unhooked, or the diaphram in the pump is bad. It's cheap to replace and comes in the carb rebuild kit. This usually just causes hesitation when you step on the gas pedal. It doesn't usually cause the engine to stop running.
2. More likely is that the main jet in the carb is clogged. At idle, high vacuum under the closed throttle plate in the carb causes fuel to flow thru the idle jet. As the throttle plate opens (as you step on the pedal), the vacuum under the plate dissipates, stopping the flow of fuel thru the idle jet, and the vacuum ABOVE the throttle plate increases, which is supposed to then draw fuel from the carb bowl thru the main jet in the carb. If the main jet is clogged with dirt, then it can idle just fine and die as soon as you step on the pedal.
I'd start looking at whoever rebuilt the carb. To begin with, this is not the original carb that came on the bike. It came with a Keihin CV type carb. But the symptoms you are describing sound like you are not getting any fuel through the slow speed circuit. The choke you are talking about is actually an enricher circuit if the Mikuni is a Screamin' Eagle carb or one of the flat side carbs made for a Harley-Davidson engine. The enricher circuit has it's own fuel metering system. It mixes fuel and air that the engine runs on when the engine is cold. The mixture is very rich as well. But when you crack the throttle the least bit, the air that the engine draws in comes in through the main venturi instead of the enricher circuit. If there is no fuel or not enough fuel in that air stream, the mixture is too lean for the engine to run and it dies. If the carb had not been "rebuilt", I'd say that the jets were stopped up or that the accelerator pump is not working.
I would check the govoner spring, maybe it is worn out or isn't on correctly.
If this isn't the case I would check the fuel air mixture screws if your carburator has them, maybe it is getting too much fuel when the throttle is turned up.
Check exhust port and muffler first,then try adjusting carb Turn high speed screw counter clockwise a little at a time and try. If
that dont help the carb may need rebuilt.Also check fuel filter.
×