DRBarnhart
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This thread is starting to confuse me so I thought I'd throw in my :zz2cents: hopefully to see if we're all on the same page...
Here's a couple of things to keep in mind while you're tuning... backfiring in the intake is indicative of a "lean" condition in the cylinder and backfiring (it's actually afterfiring) in the pipes indicates a "rich" condition. If you turn the idle mixture screw in it gets leaner and turning it out makes the mixture richer.
And, when you turn the accelerator pump screw in (clock-wise) to the point of making contact you've turned the pump off. So... the more counter-clockwise turns you make on that screw the more fuel that's fed to the intake. (I tune my carb with the screw all the way IN (clock-wise) to take the pump out of equation until I get the idle and mixture adjusted. Then, after the idle and mixture are right I slowly turn the pump adjusting screw out to find the sweet spot!)
I hope this helps simply things...
Dennis
This really doesn't have any bearing on what you're trying to do. When you're talking about a "lean" or "rich" condition you're talking about what's happening inside the cylinder. So, when you twist the throttle then try to start the engine the gas/air mixture in the cylinder is "lean" so the fire ignites the gas it can find which is in the intake. About all this tells you is that you didn't need to twist the throttle twice to get the bike running!
Here's a couple of things to keep in mind while you're tuning... backfiring in the intake is indicative of a "lean" condition in the cylinder and backfiring (it's actually afterfiring) in the pipes indicates a "rich" condition. If you turn the idle mixture screw in it gets leaner and turning it out makes the mixture richer.
And, when you turn the accelerator pump screw in (clock-wise) to the point of making contact you've turned the pump off. So... the more counter-clockwise turns you make on that screw the more fuel that's fed to the intake. (I tune my carb with the screw all the way IN (clock-wise) to take the pump out of equation until I get the idle and mixture adjusted. Then, after the idle and mixture are right I slowly turn the pump adjusting screw out to find the sweet spot!)
I hope this helps simply things...
Dennis
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