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hello we have a 191 fs and it is powered by a 115 yamaha also. the dealer has been working on the boat because the engine blows out when turning anyway. he put on a 13x17 stainless prop for me to try and we went fishing with myself and 2 other guys if we all set in the rear the boat wouldnt even plane out and rpm's wouldnt go above 3200 once the guys moved to the front it planed out and turned nice but top rpm was 4800 to 5000 yamaha said I didnt get the 115 hp from my motor untill 5500 rpm so they said not to run the boat untill we get the rpm's higher because it was to much load on the engine hope this helps I have a 13 1/4x 17 3 blade allum. to try now but havent made it to the water yet ....Geo
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