Aquasport Mechanicals - things that need a wrench, screwdriver or multimeter > Props
1981 20ccp 1994 johnson 225 ocean Runner
charliemyjak:
:think: Any one have an idea what prop should I start out with ball park, It originally had 14"x 17" stiletto SS I'm turning around 4500 rpm at about 43 mph GPS.Engine calls calls for around 5500 wide open would a 15" x 21" get me in the ball park. any Ideas would be appreciated thanks.
wingtime:
Is the 4500 full wot? Also how accurate is your tach?
charliemyjak:
Yes wot put another tach on also to double check. motor runs great bring motor on plane with ease just feel should be getting more from her
wingtime:
Good solid motor. I'd check to make sure you are getting spark in all cylinders. I had that problem on mine. Also when were the carbs cleaned last? A dirty carb could cause a lean cylinder (not good on a two stroke). I'd start pulling plugs to see how they look. New plugs are cheap. Use the plug they recommend (QL78YC I think)not a NGK.
Here is a video of testing the spark on my 225 Ocean pro
charliemyjak:
I took all carbs apart cleaned checked float levels. Also put new plugs ran it pulled all plugs looked good except #5 didn't appear to have the discoloration as the rest. Compression is good on all cylinders changed coil and wire on that cylinder started on hose actually sounded more consistent. Timing is good could power pack be going bad. Also in water what should idle be at . I'm about 620 -630 in gear is that too low does not stall out or anything runs great. Thanks for any ideas Wingtime
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