My question is always, have you verified that it is actually overheating? Thought those engines were pretty basic with not much of anything to worry about. One thing I would look at is if air is getting in the cooling system. I know failing head gaskets can push air in at slow speeds and cause overheating, but at higher rpm's the water flow is enough to overcome the air getting in.
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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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