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  1. #1

    Yamaha 1200 xlt waverunner 2001 seizure problem?

    I bought a 1200 xlt waverunner 2001 first day it ran fine second day it was only running half speed it was initialy doing. Found out the 3d piston was seized had also ruined the cylinder. Replaced cylinder piston and rings on 3 and replaced rings on the other 2. Went out to break it in. initialy accelerated 20% as manual says and then let it sit for 30 min and then back again this time up 50% another 30 min to cool. This time up to 90% went fine let it sit 30 min and then tried again after 10 min of riding it shut off as I was doing 40mph. brought back in checked the compression. Number 1 and 2 are 100 number 3 is 75. Pulled the plug and looked inside seems like the piston head is starting to get scratched, I think I am still in time to save the cyl.

    Question is what is causing this?

    It is still the same cylinder.I read on other posts that compression should be 120 for this unit, since none of the cyl is that and I just put new rings on it where should i look?

    Thanks,

    Will provide pictures later.


  2. #2
    If your not doing something, its hard to screw up. stlouisramsfan's Avatar
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    100 or 120 could be the accuracy of the gauge.... but the main problem you have is solving what smoked the engine the first time, it is likely causeing it again... could be 100 things, post pics and let the experts give their opinion
    your lucky you came here, these guys are the best at these mototrs...

  3. #3
    ryffryda's Avatar
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    was the cylinder bored or is it new?

  4. #4
    Cylinder and piston brand new, the cylinder head the old one but it had some scratches.

  5. #5
    snowrunner's Avatar
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    Quote Originally Posted by ermand View Post
    Cylinder and piston brand new, the cylinder head the old one but it had some scratches.
    Seems like oil starvation. You probably have air in the line, did the same thing. You need to look at the oil lines. Also, you need to purge the oil lines of air and add oil to gas on first trip after rebuild. Oil pumps seem to fail on 1200's or have some type of feed issue.

    Check your lines first, you should be able to see air in the line. Otherwise, you may have already got the air out by driving it, damage is done though. Get the piston out and scotch bright it and cylinder to remove any rough spots.

  6. #6
    CHICKA WAH WAH bren's Avatar
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    Quote Originally Posted by snowrunner View Post
    Seems like oil starvation. You probably have air in the line, did the same thing. You need to look at the oil lines. Also, you need to purge the oil lines of air and add oil to gas on first trip after rebuild. Oil pumps seem to fail on 1200's or have some type of feed issue.

    Check your lines first, you should be able to see air in the line. Otherwise, you may have already got the air out by driving it, damage is done though. Get the piston out and scotch bright it and cylinder to remove any rough spots.
    oil pumps don't fail (well, very rarely do they fail) (not dissing, just factoring as snowrunner did say some type of feed issue)
    people forget they have to be bled after assembly, and they have to be dialled in to the cable retention. there is a guide to this in the service manual.
    oil lines can fail due to improper fitting, also to air pockets in the main feed, however, mainly to perforation.
    were the carbs checked for corrosion, check valves, filter screens?

  7. #7
    Some of the pictures aren't as clear so i posted a few more
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  8. #8
    I did put 2t oil 1:50 like the manual said. Why did it only happen on number 3 again? I can't figure that out.

  9. #9
    It's not the oil I checked that. Is there any way I can test the cooling system when the jet ski is out of water?

  10. #10
    icky002's Avatar
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    If it were me I would get the carbs checked out. Anytime you get a used waverunner no matter what the seller says it's good to make sure the carbs are good. I don't know enough to suggest anything else, but it can't hurt.

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