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#1
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Actually, I think that I'd try a 14 1/2 x 17 prop for that engine. (The smaller dia. will let your RPM's come up a little, and the extra pitch should help with your top end once they get there). As to the fouling, is it really fouling, (as in not firing) or does it just have some black residue on it from the break-in? I use Seafoam as a preventitive measure, not as a corrective. And even then I only use it about every 6 tankfuls or so. (When I remember to add it)
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer 1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer 1996 V21 w/1993 200HP Mercury on a Shoreline Trailer All towed by a 5.7L Hemi Durango. If God didn't have a purpose for us we wouldn't be here, so Live simply, Love generously, Care deeply, Speak kindly. (Leave the rest to God)  Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless. 
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#2
07-21-2011, 04:29 PM
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Quote:
My Honda spun up to redline (6gs) as fast as you could ask it to w/both the 15 1/4 & 15 1/2 props...the extra diameter didn't slow it a bit... As for the suspicion of idling causing the cyls to load up...it may very well be...a trick to prevent that at idle is to TILT the motor UP a little PAST LEVEL...that prevents unburned oil from building up in the top of the cyl and fouling the plug...a marine tech told me that years ago and it worked on the 150 Evinrude I had at the time...
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'74 V-20/ BF 150 '95 V-21/ BF 150 '84 V-20/ 200 2.4 Merc '87 V-20/'18 F150 Yamaha 
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#3
07-21-2011, 04:50 PM
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Joker, I reread some stuff and edited a portion I posted earlier about a 17" stainless or a 19" aluminum should be about right. It was supposed to be a 17" stainless or 15" aluminum.
I ran a 14.8x17 aluminum and a 14x19 stainless on mine and got almost the same exact numbers fuel, speed and rpm wise. I need to go to a 17" stainless. http://www.wellcraftv20.com/communit...ad.php?t=12543 And get you a gallon of Seafoam, mix to what they suggest. Think it's 1oz per gallon.
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 '75 Cuddy with '00 Johnson Ocean Pro 150 horse Benny Last edited by tsubaki; 07-21-2011 at 04:55 PM.
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