Compression on that engine should be 85-90. When doing a compression test, the throttle MUST be wide open and you NEED a GOOD HOT battery. They have fairly low cranking compression because they have an idle relief in them that vents compression out the exhaust. At higher RPM the relief doesn't let much out, but at low RPM's it lets alot out. It makes them use a bit more idle fuel, and smoke a bit more, but it lets them idle so much smoother. If you block the reliefs, compression should be around 125-135 on it cranking compression. Be ABSOLUTELY CERTAIN the carbs are clean in it as a SLIGHT lean out WILL burn a cylinder up. And to be safe, do a decarb on it as the #1 killer of these engines is stuck rings from hardened carbon buildup.
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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.
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06-01-2016, 09:07 PM
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