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.

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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

  7. #5

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    Hey All. I just got around to looking at the bike as I thought this was simple and didnt want to pay the dealer until I knew it was something I didnt want to deal with. I was in the process of removing the exhaust as a first step to finding the source prepared to even remove the casing. I didnt think it was serious as the bike ran well at idle when cold or hot and there was no smoke. I did pull the plugs and they looked fine with some minor pitting. But, 2 were 9's and two were 8's which are two different plugs. I did replace them since they were out and the bike only having 7k miles on it when I purchased it Im assuming they were factory.....anywho upon attempting to remove the exhaust the lower half got caught on something and I noticed a cable system similiar to a throttle body but it had no cables and there was a broken wire handing from it. I thought this looked like some sort of live exhaust. After a google search all questions were answered. The PO removed the actuator, somehow got the F1 light to not come on and wired the valve what appeared to be open and the wire had broken. I put the exhaust back together, started the bike, reached down and held it open and sure thing. The noice was the valve bouncing around i the exhuast(no spring) and the lose of power was the exahust being blocked by the valve being closed. I permanently fixed it open and man this thing sounds amazing and pulls harder than I already knew it could. This explained a lot of my riding complaints and intermittent issues. One of my buddies has an identical bike to mine and his bike has always been a length or two faster and we never knew why. I had popping on decel since I purchased it and it had developed what I thought was a slight misfire and popping on accel and decel and a few other intermittent issues. All resolved, she sounds very throaty now and runs better than it ever did.

  8. #6
    Very Active Member Sasnuke's Avatar
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    There is a mod to keep the FI light off by cutting the brown wire at the ECU..located on the left side of the bike.
    I believe it's pin 7 on the ECU connector if I remember correctly.
    2008 M109R2 Black - Flat black rims, Smoked turn signals, K&N Replacement filters, 2006 Exhaust Debaffled, & HealTech GiPro A-TRE G2.

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