mercury 850 thunderbolt

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,146
Sure, you would turn the idle stop set screw in a bit to advance the timing. Of course, the location of the idle stop set screw varies on the year of the motor. You have distributor ignition with one coil or 4 coil ignition?
 

hotnorm

Cadet
Joined
Aug 27, 2015
Messages
9
got it that adjustement I saw it last week where the throttle arm connects to the carbs on my thunderbolt ignition model
 
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