If you’re unsure, pre mix another tank. It won’t hurt anything
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GTS cavitation?
- Thread starter Gwstaudy
- Start date
So when I posted that other message I had the ski in the water it was running good but it would stall sometimes and would be hard starting but then other times it would start first crank. I went on an oil run because the light came on and it took about an hour. I came back and filled it up and went out but it wasn’t running right. It was like maxing out at a lower rpm as if it were cavitating but it wasn’t. Randomly it would pick up and get power and be able to go faster. If I blipped the throttle a lot it would get up in plane and I could go like I was before. It would run good till I stopped and when I went to go again I had to do the same to get up and going. When it was up and I was moving fast it seemed like it would randomly give me the real power it should have then it would drop and have less power.
Sounds to me like it’s running rich on the low end circuit, could try turning the low speed in 1/8 turn. Easy to put the voltmeter on the battery and run the machine to 4500 rpm to see if it is a rectifier. With it randomly losing power at high speeds, I’m not sure. I can’t remember if you rebuilt the fuel system or not? But I would go through the fuel system, if you haven’t already. Don’t keep driving it, in this condition though
That would cause it to be maxing out at a low rpm and speed?
Correct me if I’m wrong, I read it as you were having trouble getting it up to speed but if you feathered the throttle you could eventually get it to go good? If I read that right that sounds like the low speed circuit is a little rich. You are saying that at higher speeds it would go good and then drop and have less power? To me that sounds like your not getting enough fuel at higher rpm’s. Did you rebuild the carb with a good kit and do the testing on it? Good black fuel rated fuel lines? New fuel selector valve from reputable company not Amazon? Or leak test it? Did you leak test the crankcase after rebuild? Definitely like to see what others think, but it sounds like fuel/air to me
Yeah if I just got on it and pulled the throttle it would go but max out at a low speed and not go any faster and more throttle wouldn’t help. The carb has been completely rebuilt with good parts and tested. The whole fuel system has also been rebuilt. I never leak tested the crankcase. It gets up after feathering the throttle but it’s iffy. Sometimes it works right away and sometimes it takes more time. When up on plane and cruising it seems like it’ll suddenly get more power without accelerating and then it goes back to how it was after a bit. It’s very random.
Are you saying the engine revs out fine, but you’re just not moving like you should be?
No it’ll stop revving up even with more throttle like it’s maxing out and if you feather it it’ll start going normal again.
Check the regulator.rectifier, but sounds like a fuel issue. Where did you buy the carb kit from? Don’t think it’s your issue, but have a 1 minute ride with the seat off and look for exhaust leaks. You’re not running any aftermarket fuel filters or air filters?
Not sure where I got my carb kit but I’m certain it was an OEM Mikuni kit. How do I check the regulator and rectifier? I took the seat off while riding and didn’t notice any exhaust leaks. It has no aftermarket parts besides the impeller.
Just turn your multimeter to DCV, put the leads on the battery , check volts at rest, start the ski, see what they are at idle, I believe 12.8 ish to around 13.5 ish at idle and then see what you get at roughly 4500rpm, should be roughly 13.5 ish to 14.5 ish.
I don’t have a tachometer but I’ll do my best.
It doesn’t need to be precise at all, just as long as rpm’s are increased and volts go up but stay in correct range
