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78 Johnson 55 hp propeller pitchdiameter question

bryan

Member
" I got 4000 rpm's WOT. My

" I got 4000 rpm's WOT. My engine is running lean I'm fairly certain, because it won't idle unless I bump the choke, I bumped the choke at WOT and the rpm's increased by 100. I'm just doing a little research as far as my prop is concerned in case I don't achieve 5000 rpm's after I straighten out my carburetor problem. Right now I'm running a 3 blade, 12-1/4x15 prop. Is there a formula or rule of thumb method to determine the correct prop?
Also, could I get some feedback on the Comprop line of props? (4-blade composite) "
 
2 inches of pitch equals abou

2 inches of pitch equals about 500rpm @ wot.Get your carbs fixed first.How do you know your tach is accurate?
 
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