DJ_Allatoona
Petty Officer 2nd Class
- Joined
- Feb 24, 2008
- Messages
- 187
1986 75 HP. Serial number is 0A984714. Boat is a 1975 Starcraft SS. Here's a picture: http://i.imgur.com/3MnQeD5.jpg
Problem is this: when I am alone on the boat, it jumps out of the hole like it should. But when there are a couple extra people on board, or I'm trying to pull a tube or a skier, the motor suddenly dies when I push the throttle all the way forward. I mean, it doesn't sputter or even rev up, it just dies like I pulled the key out.
Now, I have a technique that sometimes works when I'm under a load: I nudge the throttle out of idle, and gently advance it while the motor tries to bog out, and I do this back-forth-back-forth with the throttle handle, snatching it back to idle when it's about to stall, then moving it forward again. On one of those pushes forward, it will "catch", and VROOM! Off we go like nothing's wrong. Needless to say, this is an enormous pain in the butt when people are with me, or I'm trying to pull up a wakeboarder.
My theory: fuel delivery? So in the past few days, I have done these things:
1. Seafoam shock treatment. I ran through a heavy mix of gas & Seafoam. Let it sit for 30 minutes. Rode it hard on the lake. Lots of smoke. Repeated that two times.
2. Replaced the fuel line, primer bulb, plastic tank connectors, and inline fuel filter.
3. Rebuilt the fuel pump. The old diaphragm was kind of stretched where it makes contact with the spring, but it wasn't torn or see-through. Also replaced check valves.
4. New spark plugs.
None of those things worked. Same problem.
Now I don't know a thing about the carbs in this motor, but I think I'm about to learn. I know nothing about removing them or the jets or needles or floats or bowls. Should I attack them next? Does this problem sound familiar to anyone?
This one really has me scratching my head. All advice or opinions appreciated.
DJ
Problem is this: when I am alone on the boat, it jumps out of the hole like it should. But when there are a couple extra people on board, or I'm trying to pull a tube or a skier, the motor suddenly dies when I push the throttle all the way forward. I mean, it doesn't sputter or even rev up, it just dies like I pulled the key out.
Now, I have a technique that sometimes works when I'm under a load: I nudge the throttle out of idle, and gently advance it while the motor tries to bog out, and I do this back-forth-back-forth with the throttle handle, snatching it back to idle when it's about to stall, then moving it forward again. On one of those pushes forward, it will "catch", and VROOM! Off we go like nothing's wrong. Needless to say, this is an enormous pain in the butt when people are with me, or I'm trying to pull up a wakeboarder.
My theory: fuel delivery? So in the past few days, I have done these things:
1. Seafoam shock treatment. I ran through a heavy mix of gas & Seafoam. Let it sit for 30 minutes. Rode it hard on the lake. Lots of smoke. Repeated that two times.
2. Replaced the fuel line, primer bulb, plastic tank connectors, and inline fuel filter.
3. Rebuilt the fuel pump. The old diaphragm was kind of stretched where it makes contact with the spring, but it wasn't torn or see-through. Also replaced check valves.
4. New spark plugs.
None of those things worked. Same problem.
Now I don't know a thing about the carbs in this motor, but I think I'm about to learn. I know nothing about removing them or the jets or needles or floats or bowls. Should I attack them next? Does this problem sound familiar to anyone?
This one really has me scratching my head. All advice or opinions appreciated.
DJ
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