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  1. #1

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    oil hose popped off- no compression- Help!

    I have a 2001 XR1800 boat w/twin 1200 pv engines. I noticed some 2cycle oil in the hull, and found #1 oil injection hose had fell off. Needless to say, the cyl has no compression. Took the head off and the tops of the pistons look good. I took off #1 cylinder and found the piston walls were scored up pretty bad. The inside of the cyl looks good except for some aluminum galling from the piston. I'm gonna need a new piston and rings for sure. What is the best way to remove this galling? Is this cylinder honable? (I think they are the nikisil plated ones) Also, is there a drain plug or bolt that I can remove from the crankcase to drain the old oil out. I see some metallic particles on the crank and and was wondering what is the best way to flush this out?


  2. #2
    Call Carl at Island RACING he is the jet boat guru!! He can get you all your parts and help you with your jet boat issues

    516-883-0090

    He sells a kit with better clamps and such to keep those oil lines on tight.

  3. #3
    Flying Scotsman's Avatar
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    If there are particals of metal on the crank it will need a good inspection.
    Cylinder might clean up with acid
    No oil to drain its a 2 stroke no crank case oil.
    Pul the engine and split the cases.inspect crank and replace if needed.
    Have the cylinders looked at they may need recoated
    Then new pistons and rings.
    You know the cause of the damage was the oil line so you may want to go premix.

  4. #4
    I suffer from waverunneritis!!!! PWCManiac's Avatar
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    Don't take the quick way out. Make sure you fully inspect it all the way down to the crank shaft like Scottsman said. As some of us here know, those oil hoses area horrible... Now it's time for you to go premix.

  5. #5

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    Since I have the #1 jug off, can I use kerosene or diesel to fill up the crankcase and then pump it out with a hand pump to get some of that aluminum dust out? How does the 2 stroke oil get down into the bottom of the crankcase? I know SeaDoo has an oil line that enters the case, I can't locate one on the Yamaha.

  6. #6
    Flying Scotsman's Avatar
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    Your oil gets mixed with gas and air
    Enters through the carbs then through the cases then up into the cylinders the head and out the exhaust

  7. #7

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    I realize that, but is there supposed to be a some oil (2 stroke oil) in the very bottom of the crankcase for the crankshaft to spin around in to aid in the lubrication of the bearings? If so, how does it get there?

  8. #8
    Flying Scotsman's Avatar
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    It gets atomized in the fuel
    A 4 stroke has a crankcase that holds oil a 2 stroke does not

    Your oil gets mixed with gas and air
    Enters through the carbs then through the cases then up into the cylinders the head and out the exhaust

    As it goes through the motor it lubricates the crank.

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