the pointy end is the bow
Join Date: Aug 2006
Location: La Conner, Washington
Thanked 27 Times in 26 Posts
Rep Power: 10
I have the same motor. The raw water goes through the transmission before it goes through the engine on mine. It''s not uncommon for the water passage around the transmission to clog up and restrict coolant, which would can cause over heating. I wouldn't expect overheating to lead to lower rpm unless it's overheating so bad that the pistons are starting to seize. If the motor has low rpm when the engine is still cool, that would rule that out.
BTW, we've had other folks who have experienced low rpms because of fouling either on the bottom or the prop.
Is your bottom clean?
Is this a new development?
1983 Fraser 41
La Conner, WA
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Boating for over 25 years, some of them successfully.