Rough Idle 200 Hp Johnson

Todd Z

Cadet
Joined
Oct 20, 2003
Messages
22
I have a 200 hp Johnson Oceanrunner 1995. I have the Idle set high. It will be idleing at 1200 hundred rpms and drop to 800 then back up 1200, it does fluctuate alot. Runs like a champ at wot..Could it be going in and out of that cold start mode, whatever that is. Any help will be much appreciated. Thanks Todd Z.
 

Todd Z

Cadet
Joined
Oct 20, 2003
Messages
22
Re: Rough Idle 200 Hp Johnson

Yes the thermastats are in.pretty new also they are the omc thermastats.I changed out the aftermarket ones that came in the motor..
 
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