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  1. #1

    2003 gp1300r blown crankshaft seals

    Having an issue with 2003 13r.
    Originally came in with engine mount failure. While I had engine out I did a leak test and it failed miserably.
    So new crank seals fitted. Engine was air tight N repeat leak test.
    All back together and started and ran fine. Owner then notices a loss of power and when I checked it the rear crank seal had been blown out. I removed the engine and on checking g the front seal was also blown out. So obviously backfiring in the bottom end.
    I replaced the seals. Checked the phasing of the crank. Fitted new plug's. Checked the resistance of the pick up coils. Everything checks out good. I then suspected maybe a fault in the efi controller so I removed it.
    Put everything back together and took it to water this time myself.
    Ski runs good and plugs look perfect. Only thing I noticed was if I ease of the throttle to say 50% and then floor it there is is a slight stumble before it takes off.
    I took a quick loo at the crank seals again after returning home. Maybe I am paranoid but they look as if the have moved out slightly again towards the rear coupler.
    Have I missed something here in my DIAGNOSIS. I still think what fault caused the seals to blow is there and the seals a re being pushed out gradually.
    What are the other psi be causes of backfire in the bottom end other than
    timing issue
    fuel mixture issue.


  2. #2
    boudin's Avatar
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    OEM seals?

  3. #3
    Quote Originally Posted by boudin View Post
    OEM seals?
    not oem but I have used them hundreds of times and never has a problem.

  4. #4
    boudin's Avatar
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    Do the reed cages have any signs of backfire? Compression is good, right? Try using OEM seals and sealant on them.

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