MCM 120 high idle rpm after running

79Galaxy

Recruit
Joined
Apr 21, 2010
Messages
5
After WOT runs when the control is put back into neutral, the engine idles high (1500-1700 rpm). W/O touching the control or anything else if I turn off and restart the engine, it idles fine at 500-700 rpm. When the engine is in the high idle condition, I have verified that the idle stop screw is contacting the idle cam. Other than this, engine performance is good. Any ideas on where to look or what to check are appreciated.
 

achris

More fish than mountain goat
Joined
May 19, 2004
Messages
27,468
Re: MCM 120 high idle rpm after running

Advance weights and springs in the dissy. When it's in the 'high idle' condition, put a timing light on it... If it's not back at 8 degrees BTDC, then pull the dissy and investigate...

Chris.......
 

79Galaxy

Recruit
Joined
Apr 21, 2010
Messages
5
Re: MCM 120 high idle rpm after running

Thanks. Makes sense. I guess the act of restarting somehow makes the weights/springs return...
 
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