90hp yamaha spark plug gapping

matt2002

Petty Officer 2nd Class
Joined
Apr 26, 2007
Messages
165
Re: 90hp yamaha spark plug gapping

.035 - .039" That's the gap for my 1999 75 and they're basically the same motor.2 stroke that is.
 

birdseye418

Cadet
Joined
Jul 3, 2008
Messages
22
Re: 90hp yamaha spark plug gapping

thanks,
the guy at the store said they come gapped
mutch to my surprise they were in the middle at .037- .038
 

BruceAML

Petty Officer 1st Class
Joined
Feb 26, 2007
Messages
371
Re: 90hp yamaha spark plug gapping

Just as important as the gap is the proper torque. Which spark plug did you install?
 
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