From about 3/4 throttle on, I can't get my boat to run. It bogs and bucks and wants to quit. I back off the throttle and it smooths out. s/n OE122700 in a Sugar Sand Mirage. The motor and boat were submerged a few years ago (free boat from brother in law!!!), and last summer I rebuilt the engine, new pistons, built up the crank, bored out cylinders, cleaned carbs. Reed valves were good.<br /><br />Ran great on the break in fuel/oil mix of 100:1 with 100:1 also being injected. Started having trouble on second tankful of 'normal' gas. Took boat out this year, and found the head gasket leaking due to improper torquing. New head gasket, (and several helicoils later) compression is good (135 140 140 140), cleaned carbs and checked the fuel level, tightened carb connections. Tightened exhaust manifold, set timing, great spark at idle by pulling each plug wire and watching the sparks leap a good inch.<br /><br />Starts great, accelerates smoothly with no load, acclerates under load (in water as long as the throttle is not advanced past 3/4. Jet pump impeller looks good, minor dings, and good wear ring. Took out the stator on the jet pump today, and filled wear ring with JB Weld as others have suggested, but I just don't think it is the problem. I bet I had less then .020 of clearance. My ride plate looks level and I can't see where I might have exhaust leaks, although I have had a pop or two of engine backfire when I tried starting it with not quite enough water pressure on land.<br /><br />Any ideas? Could the coils be breaking down at higher load? Starving fuel? The carbs fill very nicely, very quickly when cranking from dry, I just can't believe it is the fuel pump. Fuel screen is clean. It has the black stator, but they don't fail only at WOT, do they?<br /><br />Thanks!
