Re: Evinrude Sportwin 9.5hp vs Johnson QD 10 hp

[David Stanton]

quote 20mercman:

I will say, that among the 6 different 9.5’s I have run, I have noticed a significant difference in power between motors.

Steve

9.5s can demonstrate power differences from motor to motor depending on the condition of the rubber bellows seal on the shiftrod that keeps exhaust out of the powerhead housing where the shiftrod passes through to the exhaust housing. You can’t see this part without dissassembling the outer housing. This is a common part to fail and when it does, performance at idle and WOT is compromised. To see if this is an issue with any 9.5, take the lid off and see if it runs better in open air. When you accelerate, you may see a cloud of blue coming up around the engine block. Of course, performance differences can also be due to conventional things like low compression.
Dave