Took the boat out fishing last week - had to work at getting it to go over 5 mph. Opening the throttle would cause it to stall and almost die out -tried this several times and it finally took off like a rocket and ran fine. Here are my findings and PM accomplished:
Compression check all 4 cyls @ 135 psi
Removed and cleaned both carbs - .082 main jets installed, . 092 vent jets installed (existing ).Checked float levels OK.
Set timing 2 deg. ATDC @ idle 27 deg BTDC full speed.
Replaced fuel pump diaphragms and cracked hose at carb - was not leaking.
Checked fuel pickup tube in tank OK. No leaks from tank to fuel pump or hoses.
Idle mixture 1 1/4 turns open.
Motor starts right up on earmuffs/water hose and will not stumble - this problem will only occur under load. Can see wisp of fuel coming from venturi's when throttling up.
Plugs like brand new - not fouling. Fuel fresh 50:1 mix with octane boost added.
Am I missing something ?? Please help
Dogbreath
Compression check all 4 cyls @ 135 psi
Removed and cleaned both carbs - .082 main jets installed, . 092 vent jets installed (existing ).Checked float levels OK.
Set timing 2 deg. ATDC @ idle 27 deg BTDC full speed.
Replaced fuel pump diaphragms and cracked hose at carb - was not leaking.
Checked fuel pickup tube in tank OK. No leaks from tank to fuel pump or hoses.
Idle mixture 1 1/4 turns open.
Motor starts right up on earmuffs/water hose and will not stumble - this problem will only occur under load. Can see wisp of fuel coming from venturi's when throttling up.
Plugs like brand new - not fouling. Fuel fresh 50:1 mix with octane boost added.
Am I missing something ?? Please help
Dogbreath
