Help!! I have a 1988 Beretta success with a volvo aq131a/275. I bought the boat from my neighbor (it sat for 10 years) changed the oil and stern drive oil. Fist time out the boat performed perfectly. Second time out, right away WOT, the boat wont rev past 2000 rpm wont plane out. Since then, I have been reading forums and heres where im at. Compression check=160 psi all four cylinders new timing belt set timing and checked for timing advance with timing light, timing advances in spec. installed petronix ignition and flame thrower coil, went completely through carb and installed new gaskets and accelerator diaphram, carb seems to be fine. Engine starts and idles GREAT. Engine revs great in neutral (did so by disconnecting linkage and revving by hand at carb) Engine seems to be in GREAT running condition. so now im thinking maybe prop, prop spins straight seems fine, I marked the prop and checked for a "spun hub", no spun hub. I also tried a different prop my neighbor had which he had simply replaced trying to get more speed still same effect. Ive been told to check exhaust flapper, but I think this setup only has a flapper just above the prop not internal like my friends boat has? not sure, but I think there isnt one. I hate to give up on this, I feel its soo close to being a perfect litte boat for me. PLEASE HELP with any other possibilities. THANKS.