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  1. #1

    Lean Condition Causes? - GP1200R

    Looking a reason why my middle cylinder seized. Oil lines still attached, took carbs off and can see oil was flowing from pump to all three cylinders, looked at jets and they are fine. Going to replace Pump Diaphragm (since its apart), but it has no visible tears.

    So, it appears that it was getting fuel and had oil. See pic of piston. Why would this happen? Looks like it got super hot on the piston top. Anything else I need to check before I put it back together? I don't want this to just happen again.
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  2. #2
    An air leak or spark plug not tight enough would be my guess based on what you've described. I've seen a few that changed out spark plugs and didn't torque them enough. It ran awesome right up until it siezed.

  3. #3
    slothman's Avatar
    Join Date
    May 2011
    rebuild the carbs, install new fuel lines and oil lines

  4. #4
    Moderator RX951's Avatar
    Join Date
    Apr 2005
    League City, Texas
    I think it could also be something else besides a lean condition. Possible Deto

  5. #5
    Took a look at the jets and the were perfectly clean. Added a new pump diaphragm. Will look at fuel lines, water separator etc.

    [QUOTE=slothman;1752366]rebuild the carbs, install new fuel lines and oil lines[/QUOTE

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