spark plug gap

knackers63

Cadet
Joined
Apr 23, 2019
Messages
14
i have a evinrude 25hp 1977 can someone please tell me gap setting for plugs also i use unleaded 95 instead of the basic unleaded could this be the reason for motor at half throttle to 3/4 running like rubbish ie choking down and dropping speed to a walk
 

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
38,440
Sounds like it is running on one cylinder.----Some testing / trouble shooting to do.
 
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