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Old 10-22-2007, 09:15 PM   #1
logan5
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help with adjustments after cleaning carbs

Okay, so I just cleaned my carbs and re-installed them on the bike. Everything seems to be running fine, in fact in most cases better than what it was before. However .... before I was able to just hammer the throttle coming off the line (well, as much as a 250 can anyways), but now I have to be easy on it because too much throttle in first starting from a stop and the motor starts knocking and I have no power... almost like I'm in too high of a gear

Any thoughts?
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Old 10-22-2007, 09:19 PM   #2
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Sounds like the fuel isn't providing the acceleration 'squirt' to compensate for a large load before venturi vacuum picks up the slack; I don't usually work with carburators but did help a friend's brother with a 97 Kat that didn't run for 2 years Saturday and it took some time before we got the bowls filled before the throttles operated properly. Sure the idle is set correctly and its not just a stall off the line?
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Old 10-22-2007, 09:23 PM   #3
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thomas get a new bike! btw i need to come pick my stuff up..sorry if its been cluttering your casa. school pwns me
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Old 10-22-2007, 09:43 PM   #4
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Well, I'd like to get this bike running like a champ first before I sell it and make it someone else's problem. As far as stalling off the line, you think messing with the idle speed control is the solution, or the idle mixture?

And yeah Steve, come get your stuff. I've already used your cooler to bring drinks and snacks at my daughter's soccer games
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Old 10-22-2007, 09:54 PM   #5
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You could have a dirty circuit, vacuum leak, torn diaphra, or a few other things. Did you have any of these symptoms before you took the carbs apart?
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Old 10-22-2007, 10:13 PM   #6
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or you can just give me the bike and be done with it
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Old 10-22-2007, 10:20 PM   #7
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If the idle is too low, the vacuum across the diaphram won't be substantial once you begin to roll the throttle. The plunger squirts a small amount of gas into the venturi to help prevent stalling when rolling on it, cause a carburator works off of vacuum. There is a transition time of idle to throttle/accel that the squirt fills.

It's easy to start with the idle as a basis, then work with the mixture from there. Assuming that nothing was moved/damaged(unlikely) then everything should still be in the original location before it was removed. So only differences is unclogged passageways or torn gaskets(unmetered air leaks, leaner mixtured just mentioned above.)

Not my for-tay but I'd check what idle spec is, I didn't realize my busa was idling low until I actually checked the spec one day... comes off line alot smoother, even though fuel inj; so I checked and set my kat(carb) the next day.

From there I would play with the mixture as you need. If concerned about an air leak, carefully spray with carb cleaner(flamable) to look for leaks. Once running properly, assuming idle didn't fix it and the mixture adj. did, may have to reset idle adjustment.... fyi, but sure ur aware; should be done hot...
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