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idle riding up and up and up

Fuel System: Gas (Petrol) tanks, Carburators
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crispy
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Joined: Sat Jul 10, 2010 11:04 am
Location: los angeles, ca

idle riding up and up and up

Post by crispy » Wed Aug 04, 2010 10:14 pm

got my bike fired up and it sounds amazing. adjusting idle has been quite a task though. after setting idle screws to where the motor purrs, after a few revs of the throttle, the idle climbs up and up until i have to choke it or turn the bike off to kill it. i did rebuild the carbs with a keyster kitbut not sure if that is part of the problem...
64 CB160 cafe, 76 CB550 stock

teazer
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Joined: Mon Feb 08, 2010 10:32 pm
Location: Midwest US

Post by teazer » Thu Aug 05, 2010 12:22 am

Typically that problem comes from one of three sources:

Cable/s tight (not enough free play in the throttle cables)

Air leak

Advance springs soft or advancer sticky and not returning to fully retarded.

Gunner_CAF
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Posts: 316
Joined: Sun Oct 12, 2008 5:28 pm
Location: Wisconsin, USA

Post by Gunner_CAF » Thu Aug 05, 2010 7:02 pm

Are the slides in the carb sticking open? If you pull the boots off, you can use your fingers to feel the slides move as you work the throttle (engine off of course).

If the slides are closing, you should check to see if the jet needle on the slide has the clip installed right. If the needle can push into the slide, it can cause the engine to rev. I had this happen on another motorcycle and it took me a long time to sove that one.

Gunner

LOUD MOUSE
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Joined: Mon Aug 15, 2005 8:23 am
Location: KERRVILLE, TEXAS

Re: idle riding up and up and up

Post by LOUD MOUSE » Thu Aug 05, 2010 7:35 pm

Ya have one slide way to high and it is running the engine at idle.
Turn both slide screws out until the slides bottom them follow the process in the FAQ "how I tune my engine" and it will help to adjust the idle RPM. ........lm

crispy wrote:got my bike fired up and it sounds amazing. adjusting idle has been quite a task though. after setting idle screws to where the motor purrs, after a few revs of the throttle, the idle climbs up and up until i have to choke it or turn the bike off to kill it. i did rebuild the carbs with a keyster kitbut not sure if that is part of the problem...

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