07 M109R sudden loss of power and noise from right side of engine
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Thread: 07 M109R sudden loss of power and noise from right side of engine

  1. #1

    Default 07 M109R sudden loss of power and noise from right side of engine

    Hi All. I was on the interstate last week and downshifted to switch lanes and the bike suddenly loss power and makes a loud rattling noise from the right side of the engine. I got it home limping it in one cylinder and the exhaust pressure is significantly lower on the front cylinder (put my hand behind each exhaust and lower pipe has less pressure). I can't see anything obvious and it sounds like the noise is internal. It doesn't make the noise while cranking only when running. Any ideas? Are these two separate issues or did I maybe lose a cylinder due to spark plugs or no gas and it's causing the rattle? Don't think it's a rod or anything as it seems to high pitched for rod knock and again it only does it when running. What do you guys think?

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  3. #2
    Very Active Member
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    loose spark plug ? head gasket maybe ?

  4. #3
    Very Active Member Mrtallguy67's Avatar
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    I had a similar issue and it turned out to be a bad plug. The ceramic part disconnected from the metal base and was causing compresion loss and a knock. Remember our bikes have 4 plugs so check all 4.

    BOTM: SEPT 2016
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  6. #4
    Very Active Member Bering_C_Sparky's Avatar
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    Do a compression check as well while you are inspecting the plugs. (2 birds)

    BCS

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