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    Most waterproof boat fuel gauges are something...

    Most waterproof boat fuel gauges are something like 33 full-240 empty ohms. I believe Yamaha waverunner gauges are 9-800 ohms.
    So youíll be buying a fuel level sensor (and customizing it into the...
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    A scoop style intake grate on the jet pump will...

    A scoop style intake grate on the jet pump will probably solve your porpoising issues.
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    Exactly. Just worry about getting new hoses and...

    Exactly. Just worry about getting new hoses and very secure clamps. The preferred clamps are oetiker clamps. Someone can chime in on hose size, I canít remember. Itís metric, but most people use a...
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    The finger throttle just clamps onto the...

    The finger throttle just clamps onto the handlebar. So you should be able to loosen it and adjust it around to a comfortable position. And you probably could figure out a way to convert it to a thumb...
  5. I think that rubber grommet around those wires...

    I think that rubber grommet around those wires pops out of the box and stays with the wiring.
  6. Not a leak down test. You need to do a crankcase...

    Not a leak down test. You need to do a crankcase leak test.
    You need to somewhat reassemble the engine, seal off the intake and exhaust, and put air pressure into the crankcase. Spray soapy water...
  7. My feeling is air leak lean meltdown. So now...

    My feeling is air leak lean meltdown.
    So now you can try to put it together, air leak test it, and try to find a leak. Or you can rebuild it and completely reseal it...then air leak test it.
    I...
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    Hereís what kills a 2 stroke Jetski engine: lack of oil and lean air/fuel mixture.
    Oil: keep the oil injection system in tip-top shape. The hoses are the weak point. They get hard and fall off the...
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    #3 is the rear/PTO side

    #3 is the rear/PTO side
  10. It could be lean because of the cold weather.

    It could be lean because of the cold weather.
  11. The choke cable is attached to the carburetor so...

    The choke cable is attached to the carburetor so Iíd look there to see if itís broken or disconnected.
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    I had the whole exhaust apart when I did my...

    I had the whole exhaust apart when I did my engine. I cleaned out a little bit of sand and small pebbles. And I made sure water flowed everywhere it was supposed to.
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    I could see an Outboard primer bulb potentially...

    I could see an Outboard primer bulb potentially causing fuel pump damage. But thatís a different story compared to the primer kits made for PWCs.
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    Check your impeller clearance and repair as...

    Check your impeller clearance and repair as necessary.
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    I just cut up an tire inner tube to make block...

    I just cut up an tire inner tube to make block off gaskets and pumped air in through a pulse fitting.
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    The ski is 22 years old. The rubber crank seals...

    The ski is 22 years old. The rubber crank seals and paper case gaskets are possibly old a brittle and leaking. If you can do a pressure test on the crankcase and it passes then you are good to go....
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    Itís not so much that the fuel pump gets damaged from a primer pump, itís more of a problem to damage the engine. A primer pump installed on the fuel supply line to the carbs could introduce air in...
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    Donít run your ski at 32*F and wonder why it runs funny. That seems silly.
    Another red flag is that the bottom end of the engine was not disassembled and resealed. On a ski that old, thatís asking...
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    Yep. An airtight, well built stock engine will be...

    Yep. An airtight, well built stock engine will be ready to run on stock carb settings.
    Hereís my take on oil injection. The pumps donít fail, the lines do. If you can properly secure the lines,...
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    Almost all fuel related engine damage occurs at...

    Almost all fuel related engine damage occurs at WOT. You wonít be running WOT during engine break in if you do the way a lot of people do it. So just set the carbs up at the stock settings or use one...
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    Wow. A hole in the middle of the piston could...

    Wow. A hole in the middle of the piston could mean it had a air leak from a loose spark plug but I canít tell if it is lean/hot melted down the middle or if something physically punched a hole in it....
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    Before you open the engine up, you might want to...

    Before you open the engine up, you might want to do a 2 stroke pressure test to make sure there arenít any air leaks in the engine. If there is, then youíre going to need to reseal the whole engine.
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    My thoughts are you have a gummed up carb or...

    My thoughts are you have a gummed up carb or carbs, causing it to run lean at WOT, and causing a lean piston seize. If it fails a compression test, thatíll be a clue towards that.
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    Do a compression test. You may have stuck a...

    Do a compression test. You may have stuck a piston and might need a top end rebuild.
  25. Sticky: View Post

    You canít.
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