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#1
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As a rule of thumb, every downward pitch change should get you an extra 400-600 rpm... so a 21 to a 17 sounds like it should do it.
__________________
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
06-01-2010, 10:41 PM
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Quote:
__________________
2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD  AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664 
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#5
06-02-2010, 01:57 PM
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That prop should be about perfect.
Does the possibility exist that the motor may need to be decarboned? Say with Seafoam or the like. I just got through outfitting a boat for my daughter and her husband (and the grandkids) with a motor I'd had for years. When I first got the motor it would idle and run good to great but never seemed to have the top end speed I thought it should have, changing plugs, props, etc, never solved the problem. When I put it on the other boat it performed the same till I fogged the carbs a few times and started mixing Seafoam in the fuel. It is slowly improving and turning a little more rpms running wide open than what it used to.
__________________
 '75 Cuddy with '00 Johnson Ocean Pro 150 horse Benny
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#6
06-02-2010, 02:33 PM
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Seafoam sounds like a good suggestion.I will give it a try.This is my first outboard,I have owned I/Os in the past.
I was pleased with the performance of the motor,other than the low RPMs. She would jump up on plane fast.Guess you call that a good hole shot.
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#7
06-02-2010, 03:43 PM
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Besides mixing with the fuel, get a spray bottle with Seafoam in it and let the motor get to temperature and spray some in each carb throat, let it smoke and stabilize to run even and do it a few more times after that.
I would expect it will take a lot of doing this at regular intervals in order to remove enough to make a difference. A daily outing with a good mix of the stuff should certainly help.
__________________
'75 Cuddy with '00 Johnson Ocean Pro 150 horse Benny
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