Problem with late 80's 135hp Mercury - no high rpm, no power..
Late 80's 135hp Mercury outboard.
Problem -
Won't rev much over 4000-4400 rpm.
Feels slow revving and lethargic when in neutral. Not sure if that's normal for these older outboards to rev like this .
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Quick history.. I was given my Dad's Crest pontoon that he replaced the little 50hp with a late 80's Mercury 135hp engine I had sitting around.
Before running it the carbs were cleaned, fuel lines replaced, primer bulb replaced and fuel filters.
Motor started up and ran (runs) nicely.. just won't run much over 4000-4200 rpm.
My dad figured the pro was wrong so he found a smaller prop..same performance, but he didn't care as it was a canal cruiser.
Well the Pontoon is now mine and I need this engine fixed.