Home › Forum › Ask A Member › Top speed with 18hp Evinrude on 14′ aluminum › Re: Top speed with 18hp Evinrude on 14′ aluminum
January 15, 2017 at 11:55 pm
#51103
quote fleetwin:
Looks like I have missed a lot on this thread in the past few days….
First, Bill is absolutely right, good compression readings do not guarantee all is right with your powerhead.
I am confused by all your pictures and postings at this point. You have several pictures of horrible looking scored pistons with jammed rings. Needless to say, these parts are not usable and can not be “repaired”. The corresponding bores are surely damaged as well. My question is which powerhead did these pistons come from? The original blue powerhead, or the replacement white powerhead? Or, do both powerheads have bunged up pistons and bores?
First, Bill is absolutely right, good compression readings do not guarantee all is right with your powerhead.
I am confused by all your pictures and postings at this point. You have several pictures of horrible looking scored pistons with jammed rings. Needless to say, these parts are not usable and can not be “repaired”. The corresponding bores are surely damaged as well. My question is which powerhead did these pistons come from? The original blue powerhead, or the replacement white powerhead? Or, do both powerheads have bunged up pistons and bores?
The blue powerhead is what my outboard came with (as a project), I learned it was trash after tinkering with the motor a long time. I bought the white powerhead off ebay to replace the blue one but it turns out it is bad too. I haven’t taken the white one apart yet, but I did remove one of the covers where the fuel pump bolts and posted a photo of the side of the piston through that hole. It looks like the motor has been hot. The thermostat was also removed when I got the white powerhead.