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  1. #1
    OCFZR's Avatar
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    1300 no compression rear cylinder

    I just purchased a gp1300r with 89 hours for $1900. The rear cylinder has zero compression. The other 2 are at 120 -125 lbs. The motor is completely stock. What could be the cause other than lack of oil? I have a 1200r and am not familiar with the 1300 fuel injection system.

    thank you


  2. #2
    r33pwrd's Avatar
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    Pull the head!

  3. #3
    OCFZR's Avatar
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    I'm going to pull the head this week and see what the damage is to the piston. I know it is a completely stock engine and has never been worked on.

  4. #4
    spud's Avatar
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    Be careful on disassembly and look for a loose oil line. Once you pull the head take some pictures and post them. That will tell a lot. It could be a powervalve that got loose, or a spun ring or other things that aren't related to the injector. Good inspection on tear down should help you out.

    Are you going to switch to premix?

  5. #5
    OCFZR's Avatar
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    Hi Spud,

    I think I'm going to keep the injection. The injection works fine as long as you have the oil lines on tight.

    I'm thinking the problem is power valve related. No way to know for sure until I pull the head. I got a GREAT deal on this for only $1900! I'm going to use the money I saved to make it a stage 2.

  6. #6
    spud's Avatar
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    Cool. I'm thinking on a day off work and a morning tuning at Elsinore this week. I need to check my calender at work to see which day is best. Weekends are too crazy and the wind will be blowing too hard after noon. Thursday sticks in my mind as a good day.

    You, Rob, Bill, Joe, Mark anyone else we can think of and myself need to plan some trips to Senator's in the fall. West Coast style (under 80 ). Mark might not fit in there but the rest of us may.

  7. #7
    OCFZR's Avatar
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    Pulled the head today and here is what I found. Looks like severe deto!

    What could have caused this in a stock 1300 motor that has never been touched? I need a new cylinder and head!
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    Last edited by OCFZR; 08-28-2006 at 06:09 PM.

  8. #8

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    I'v seen water do that to, don't stop now keep riping apart allso run bunch of 2-stroke oil to bottom end may save crank

    later cd

  9. #9
    Moderator Insanediego Joe's Avatar
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    My friend thats not deto. That motor was severly lean. I think you need to get the cylinders off pull the motor and crack the cases to inspect the crank and crank bearings.

  10. #10
    WATER WOODY's Avatar
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    Check oil line on that throttle body.Looks like a crank bearing in the rear let go.

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