I ahve a 2001 50 johnson on a 13 checkmate runs 40 with a 19sst prop at 6k rpm...what is my choice for props for thi motor...also have had trouble with thermostats sticking with this engine.would it be wise to run without thermostat and just the insert with a 3/8 restriction..on the hose it runs about 90 using an infared temp gun..Thanks
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