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#1
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Being this is a 60 degree looper, the 120 sounds alot closer than the 100 reading. I would expect to see around 110-115 out of it. I believe they are finger port engines which makes them slightly higher compression. 20 pounds difference from one side to the other is a bit excessive, but doesn't really surprise me since you've said this engine was recently rebuilt.
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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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#2
08-03-2011, 11:04 AM
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Any ideas on what a 93 200 Yamaha 2-stroke should be at for comp. When I did mine it was 115-120 on all 6 cylinders. It was a little rough the first time I started it and let her idle tell warm after that all good. She run like a top at all speeds with and without a load.
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93 V-21 200/9.9 Yamaha
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#3
08-03-2011, 12:21 PM
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Quote:
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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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#4
08-03-2011, 01:36 PM
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Quote:
Thanks again for the info.
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93 V-21 200/9.9 Yamaha
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#5
08-03-2011, 02:02 PM
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Yes I purchased the engine newly rebuilt, in Sep, 2010 I was told that when he got the engine in off of another boat he opened it up there was nothing wrong, he changed the crank and rebuilt it anyway, but I have a problem trusting this guy having the problems I have had so far, I know he just slapped used parts on it to get it working, it has been running O. K. felt like I was a little week on power though. My past posts have told about my RPM / MPH issues. I don't really know what to do next ? Thanks for everybodys responses.
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Tight Lines !!
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#6
08-03-2011, 07:46 PM
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normally there are two different head gaskets available for Johnrudes, ones thicker than the other to drop compression for commercial use, some one could have replaced a head gasket at some point
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#7
08-03-2011, 07:48 PM
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never mind, I see thats its a 60 degree motor, I think they use orings. Check the casting numbers on the head and make sure they match
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