Back after 25+ years! Got a few questions . . .

FNG here! Picked up a couple jet skis yesterday . . . had a 650 growing up but it's been a long time. The white 440 runs and rides like a dream. The red one has a 650 in it, and may need a few odds and ends, I think I need to adjust the idle a bit, it ran good if you stayed on it, but wanted to die at idle . . . it's fast but bounces a lot at speed, going to have to see what I can do to dial it in. The white one is perfect for somebody new to learn on, really nice and smooth. I wanted a couple of beaters, so I can go out with friends and not have to worry about them getting messed up . . . figure if I get hooked, I'll keep an eye out for a nicer ski and have the beaters for loaners. Kinda felt like a requirement living here. Drove down my street, crossed the road and boom, there's the launching spot, 5 minutes tops . . . was the first time I've been to the lake since moving here! Hit the lake with my brother for a couple hours to try them out . . . I guess it's like riding a bike, we were both standing up after a few minutes.

https://scontent-lax3-1.xx.fbcdn.ne...=46f4fc6a25af5ba0c20d10986f23e0f2&oe=5A104EAD

So first ? . . . the 650 has a bilge pump and the PO mentioned it worked as of a couple weeks ago when he last had the ski out. The switch had come apart and something inside must have fell out as there's nothing to make the connection, figured, easy enough, I could throw on a new toggle switch. But then I noticed that if I touch the wires together manually making the connection . . . nothing :( Any input would help.

Second ? . . . the 650 wants to die after it starts, and wants to be primed again to restart, but if you keep on the throttle it runs fine. I was thinking maybe the idle just needs to be adjusted a bit, or maybe the pilot jet needs to be fatter. The PO mentioned it tends to run cold and likes to be primed a bit and encouraged me to ride it a couple more times before messing with it as it's been running good for him.

Third ? . . . 650 again, it's very bouncy at speed, rather than leveling/smoothing out with more throttle, it wants to bounce. Thinking the 650 is probably heavier/more powerful than whatever was in it originally. Is there an adjustment, different plate, etc that might help?
 
The bilge pump may be an automatic one. So even when power is applied the pump doesn't turn on until the float inside of the pump is raised by water.

Second issue, If it were me I would turn the idle up just a little bit and see if that makes it more happy.

Third, a longer ride plate would help reduce your porpoising.


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The bilge pump may be an automatic one. So even when power is applied the pump doesn't turn on until the float inside of the pump is raised by water.

Second issue, If it were me I would turn the idle up just a little bit and see if that makes it more happy.

Third, a longer ride plate would help reduce your porpoising.


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Thanks! I'll have to see what I have and check into a longer plate . . . funny you mention "porpoising" that is exactly how it felt! I think I may just raise the idle a hair, I can always turn it back . . . similar to a dirtbike carb . . . give it 1/4 turn increments?

Upon further inspection, the bilge wasn't even connected to the battery. Need to see the proper wiring for it and I'll see if I can get it to work manually before adding a new switch. The PO put in a new battery, and it was like 110* in the shade, so guessing he was in a rush to get it together. I'm not sure if it has a float/auto shutoff or not...I'll try to figure out what I have.
 
Suggestions on a ride plate that would help with the porpoising?
Anything longer than the stock.
You can also try a scoop/top loaded style intake grate to help.
The longer the plate the less proposing you're gonna get.
PJS, WestCoast, OceanPro, R&D, and L&S were all great makers of good rideplates.




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Just ordered a OceanPro Ride plate for my 440/550 hull w/ the 650 motor . . . hoping that will help it track and turn better. Also ordered a straighter handlebar to try out. Rebuilt the carb and now it's running like a champ . . . has a lot more get up and go compared to the 440, but it's really slick at speed.

Do I need longer bolts to install the Ocean Pro ride plate?
 
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