Hi I recently purchased boat from title and it was doing 27-30mph (depending on trim) at 3200rpm WOT, It did run very strong up to 3200 and pained without the problem with 2 person a aboard ( 3/4 gas/freshwater tank). On my last trip on the way back to marina I experienced some misfire, and other electrons started jittering (like tachometer/other electrical gauges we randomly jumping around). I suspected bad cables, so I order cables/distributor cap/rotor and spark plugs. Meanwhile I wait for parts I am trying to investigated problem with 3200rpm wot and if it's somehow connected with ignition issue, and my findings are following. My model year came only with B2 or B3 drives (gear ration 1:2.0 and 2.2) (prop 21-23p), however according to the prop model and pitch my drive is B1 (unknown gear ratio) Prop is 14.5 diameter with 17 pitch SS (QS5052X) Pitch is much smaller then original and that's main reason I believe drive is swapped as with 1:2.0 gear ratio engine would go too high on WOT. I am unable to estimate gear ratio in my drive. I know with B1 it could be 1.36, 1.5 or 1.65. Is any of these gear ration going to work with my boat by just swapping prop if needed? I believe if gear is 1.36 I stand no chance, so I hope it's either 1.5 or 1.65. Is there any way to figure our gear ratio? maybe if I can locate serial number of drive? In case ratio is 1.5 or 1.65, should i get full WOT with my current prop?