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Discussion Starter #1
Have a problem with the revs dropping to slowly when the throttle is closed.Thought it was float heights because idle is a bit uneven but took the carbs off and they where all spot on.Throttle cable is operating freely Will balance the carbs as soon as my new gauges arrive .Can anyone think of anything else that could cause this.?Hoping the carb balance will eliminate the problem.
 

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My first thought would be gummed up carbs- but you checked the float height so I figured that's not the problem.

My other guess would be carb sinc... let us know!
 

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sometimes an lean fuel mixture will cause a slow return...start with the basics first....then chase the fun stuff

from the factorypro site....

"With the carbs synched, the engine warmed up to operating temperature, and the idle speed set, adjust the fuel screws so that when you rev the bike in neutral and release the throttle, the revs quickly drop to exactly idle speed again. If, when you release the throttle, the revs hang up a few hundred rpm above idle speed, then drop to idle, the idle mixture is probably a bit too lean. Turn the fuel screws out. Use a minimum of half turn increments until you know you've just about nailed it. You'll drive yourself up the wall trying to tune the thing in eighth or quarter turn increments if you're a mile off. In extremely lean cases the idle will hunt between the proper speed and something above it. If, when you release the throttle, the revs drop below idle speed then pick up, the idle mixture is probably a little bit too rich. Turn the fuel screws in. In extremely rich cases the engine will die after revving the bike and releasing the throttle, unless you've turned the idle speed screw way in, in which case it may act like the idle mixture is a little bit too lean. In slightly rich cases, the engine will respond well to throttle blips when cold, but will die or dip slightly below idle speed when hot. While having an exhaust gas analyzer is almost mandatory during tuning of main and needle circuits, do not rely totally on them to set idle mixture. Use an accurate tachometer (like your ear) and adjust the fuel screws to find the highest vacuum for each cylinder or highest idle speed, which will often be the same setting. "
 

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make sure your choke cable is not sticking... happened to me and did the same thing. make sure when the choke is off that the choke slides are all the way against the stop. better yet disconnect the choke and manually push all the choke slides closed. hope this helps...

andrew
 
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