Idles fine, but once revved stays revved

winglem · 04-26-2019, 08:56 PM

The throttle connection on the carburetor seems to return to normal. If I shut it off, it starts up fine and idles again. If I drive it and mechanically slow it down, then it stays down. Could it be the piston has gotten stuck? I removed the carb and attempted to clean it, but haven't done the Chem Dip thing yet. A gallon is $30. Would that likely fix it?

I feel like it is running lean when in this state. While at idle, it smokes some suggesting rich.

I tried spraying carb cleaner on the intake header but the idle didn't change.

I just added SeaFoam to the tank, we'll see if that helps.

Any tips appreciated and I promise to report results. At what point do I order a new carburetor? Is there a good aftermarket carb someone could point me to?

Year: 2002
Miles: 4200

5th_bike · 04-26-2019, 09:26 PM

Sounds like idle is set too high. First, try with the white adjustment screw underneath the carb. Clockwise, seen from above, counterclockwise from below.

To set idle, just drive it until the engine is hot, 10 minutes or so, then set idle with the white screw. Don't set idle when cold, because it will afterwards rev like yours when the engine is hot.

winglem · 04-26-2019, 10:45 PM

Thanks for the reply 5th_bike.

When I try to adjust the idle, it is revving high and I slowly turn it down. Suddenly it drops real low and sometimes dies. Once I have it low, if I rev it again, it stays high. It seems like there should be a sweet spot where it runs smooth, but not too high. I wonder if I'm doing it wrong... Here's a vid of me attempting the idle adjustment.

winglem · 04-30-2019, 11:00 AM

I adjusted the valves, that made it run a little better. Did a full carb cleaning using Chem Dip and an air compressor to blow out the holes. I also did the carb rebuild using the All Balls Racing 26-1659 Carburetor Rebuild Kit from Amazon. Now it idles and runs great. Looking forward to getting some miles under my belt on this machine. Thanks all for the help on this post and others I read.

04-26-2019, 08:56 PM	#1
winglem Junior Member Join Date: Apr 2019 Posts: 7	Idles fine, but once revved stays revved The throttle connection on the carburetor seems to return to normal. If I shut it off, it starts up fine and idles again. If I drive it and mechanically slow it down, then it stays down. Could it be the piston has gotten stuck? I removed the carb and attempted to clean it, but haven't done the Chem Dip thing yet. A gallon is $30. Would that likely fix it? I feel like it is running lean when in this state. While at idle, it smokes some suggesting rich. I tried spraying carb cleaner on the intake header but the idle didn't change. I just added SeaFoam to the tank, we'll see if that helps. Any tips appreciated and I promise to report results. At what point do I order a new carburetor? Is there a good aftermarket carb someone could point me to? Year: 2002 Miles: 4200 Login or Register to Remove Ads Last edited by winglem; 04-26-2019 at 08:57 PM. Reason: Added year and miles
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04-26-2019, 09:26 PM	#2
5th_bike Senior Member Join Date: Oct 2007 Location: HoCo, Maryland Posts: 1,349	Sounds like idle is set too high. First, try with the white adjustment screw underneath the carb. Clockwise, seen from above, counterclockwise from below. To set idle, just drive it until the engine is hot, 10 minutes or so, then set idle with the white screw. Don't set idle when cold, because it will afterwards rev like yours when the engine is hot. __________________ 2005 "Saturn Black", stock + tach
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04-26-2019, 10:45 PM	#3
winglem Junior Member Join Date: Apr 2019 Posts: 7	Thanks for the reply 5th_bike. When I try to adjust the idle, it is revving high and I slowly turn it down. Suddenly it drops real low and sometimes dies. Once I have it low, if I rev it again, it stays high. It seems like there should be a sweet spot where it runs smooth, but not too high. I wonder if I'm doing it wrong... Here's a vid of me attempting the idle adjustment. Login or Register to Remove Ads
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04-30-2019, 11:00 AM	#4
winglem Junior Member Join Date: Apr 2019 Posts: 7	Running much better now! I adjusted the valves, that made it run a little better. Did a full carb cleaning using Chem Dip and an air compressor to blow out the holes. I also did the carb rebuild using the All Balls Racing 26-1659 Carburetor Rebuild Kit from Amazon. Now it idles and runs great. Looking forward to getting some miles under my belt on this machine. Thanks all for the help on this post and others I read.
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