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No performance at high rpms

dd8194

New member
" I have a '79 Johnson 25h

" I have a '79 Johnson 25hp. Runs smooth, Starts easy. At high rpm I don't see any gain in speed. Pushing 16' John Dory, 3 passengers the most. I plan on putting a new prop on before launching. Perhaps the hub is slipping. Might need more pitch. I am a novice with these engines so any advice would be appreciated. Any ideas?

Thanks,
John "
 
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