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40hp mercury prop help

ezstriper

Member
I have a Triumph 120CC 12' plastic boat, put a 02 merc 40 4stroke EFI on it to get power tilt/trim. came with no prop, talked to a prop place, said because of that small boat and power needed a 17p, which I bought. Boat very sluggish coming on plane and performance not what should be with that much power on that size boat. Feels way over propped, have no tach, so bought some small one from amazon, it only shows 2830max RPM way off the 6000 needed. but doing prop calculations shows needing a 2p prop...so know that not correct, seems to run fine when cruising...anybody run anything like this ?
 
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