1975 85hp Mercury Thunderbolt power loss.

soulbmx

Cadet
Joined
Aug 13, 2013
Messages
18
So last summer, my motor was running great. This year I have an issue. I launched for the first time this year and went out. All was good for about 5 mins. Then I lost about 50% power. My top speed at max was 20kmh.
I'm not an engine person, so I'm not 100% sure where to start looking. It's new fuel, new batteries. It starts fine, just seems to have lost power.
I have noticed that I have to put the forward lever way forward to go faster. Today I had it floored and only got 20knh.

Could it be a dirty fuel pump?

Thanks. Looking forward to suggestions!
 
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