I bought a boat and motor from a boat shop. The owner couldnt afford the repairs and turned the boat over to the shop. It sat for two years and I bought it. Boat has been restored and I have hit a snag on the engine.
Engine starts and idles beautifully and runs smooth until it gets up to around 3000 rpm and then it just bogs down. The more gas you give it, the slower it gets and then stall outs.
But, it starts right back up without pumping the primer bulb or choking it. So it seems to rule out fuel starvation.
I have pulled, cleaned and rebuilt both carbs. Set floats to parallel with upper body when inverted and the needle and seat are working fine when doing a blow test. They are opening and closing ok.
replaced both coils (one was cracked)
I am getting a good spark on both cylinders. Fires blue/white spark across 7/16" gap on plug tester.
Timing has been set to 24 degrees BTDC.
Fuel pump has been rebuilt.
fuel lines and primer bulb replaced.
fuel tanks cleaned out.
pulled both reed valve sets and they are closing with no gaps.
compression on top cylinder is 122 psi, bottom is 115psi.
replaced both hi-speed orifices
checked stator and no cracks, leaking. Pickups and sensor look pretty clean as well as flywheel magnet.
Engine is pumping water fine and runs about 119 - 125 degrees in the lake (water is 82 degrees).
Ive checked and double checked sync on both butterflies as well as setting carb throttle and timing marks.
Carb/intake gaskets are not leaking
When testing the engine on the lake with my son driving and cowling off, I can see plenty of fuel getting out of the high speed jets but it still bogs down like it is getting too much fuel. I tried pumping the primer bulb in case is was starving, but there was no change.
I am considering purchasing a new power pack and rectifier but this may or may not fix it.
Somebody please help!
Engine starts and idles beautifully and runs smooth until it gets up to around 3000 rpm and then it just bogs down. The more gas you give it, the slower it gets and then stall outs.
But, it starts right back up without pumping the primer bulb or choking it. So it seems to rule out fuel starvation.
I have pulled, cleaned and rebuilt both carbs. Set floats to parallel with upper body when inverted and the needle and seat are working fine when doing a blow test. They are opening and closing ok.
replaced both coils (one was cracked)
I am getting a good spark on both cylinders. Fires blue/white spark across 7/16" gap on plug tester.
Timing has been set to 24 degrees BTDC.
Fuel pump has been rebuilt.
fuel lines and primer bulb replaced.
fuel tanks cleaned out.
pulled both reed valve sets and they are closing with no gaps.
compression on top cylinder is 122 psi, bottom is 115psi.
replaced both hi-speed orifices
checked stator and no cracks, leaking. Pickups and sensor look pretty clean as well as flywheel magnet.
Engine is pumping water fine and runs about 119 - 125 degrees in the lake (water is 82 degrees).
Ive checked and double checked sync on both butterflies as well as setting carb throttle and timing marks.
Carb/intake gaskets are not leaking
When testing the engine on the lake with my son driving and cowling off, I can see plenty of fuel getting out of the high speed jets but it still bogs down like it is getting too much fuel. I tried pumping the primer bulb in case is was starving, but there was no change.
I am considering purchasing a new power pack and rectifier but this may or may not fix it.
Somebody please help!