If this is a early looper, the T-stats are out of the picture above 3000 RPM's. They are only supposed to be active at slow speeds, and the water diverter valve(black plastic valve atatched to the throttle linkage with 3 hoses) allows the t-stats to be bypassed. If it is a 93+ looper then most likely it is the t-stat springs or a weak pump. If it's a cross-flow also check the impeller or bypass's.
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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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