Flapper door

[Night Vision]

mac; if you are getting good acceleration from 3-6k without any stumble along with good gas mileage... and not running hot.... I'd say you're in good shape...


typically, that's where most peeps ride... most of the time.

you can adjust the pilot screws for optimal top end acceleration, most likely fatten them up, but the stumble may return, your starting routine may suck, and/or your bottom end may suffer....

you can adjust the pilot screws for optimal gas mileage, lean them out, but the stumble may return, your starting routine may suck and/or your top end may suffer AND you'll run hot....


what everyone needs to realize on these carbs is they are not ECU/FI/o2 sensor controlled fuel management systems....
they are automotive downdraft style carbs and NO MATTER WHAT YOU DO.... you will eventually end up with some sort of compromise you can live with 98% of the time  ;)

[inanecathode]

Wut? Dude, you need top end acceleration. The bike should idle, run off idle, mid throttle, and full throttle. I wouldnt accept any different on anything i ride, it came out of the factory running well, it should run well now.

[Rick G]

I would get a stock, vacuum operated flapper . Your problem may be related to the flapper.  It should rev strongly to 9500 rpm . I would not blame the carbs until I had a proper flapper setup.

[Brian Moffet]

Yeah, those flapper doors are nothing but trouble.  I just took mine off...

Brian











Oh, yes, then I rebuilt the bike and put it back on...