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Thread: Knocking Noise from R1150RT Flywheel/Clutch

  1. #1

    Knocking Noise from R1150RT Flywheel/Clutch

    Back in February I got an '02 R1150RT-P ex-CHP bike from a guy in San Francisco for a paltry $2000. He mentioned to us that the dealer it was serviced at said the clutch was "soft." Riding it around, it feels great, but the one thing I noticed is that it makes a very prominent, deep knocking noise during deceleration. I have a feeling it's not in the engine, since changing the oil for heavy-duty Delo 400LE didn't make a difference. It also sounds like it's coming from much further back than the engine; listening today it sounds like it's coming from below the rear edge of the fuel filler cap. It also occurs during acceleration, but it's much more quieter and it almost unnoticeable. It's also worth mentioning the noise is RPM dependent, the faster the engine goes, the faster (and louder) the knock is.

  2. #2
    Registered User
    Join Date
    Nov 2007
    In the state of Misery for now.
    without hearing the noise difficult to diagnose

    You can remove the starter and look in the clutch housing and see if thingz are seriously amiss

    you can also take off the valve covers and check for broken cam guides.

    that is all I can come up with you can see without major disassembly


  3. #3
    MOA #24991 Pauls1150's Avatar
    Join Date
    Apr 2008
    south of Los Angeles
    If it's true that a dealer said the clutch has issues, especially on a CHP bike, that's probably why it was so cheap. "Soft" doesn't really tell you anything...
    Take off whatever bodywork you can and listen again; it can be worthwhile to have a second person standing there as you ride by, to perhaps localize the noise.
    Under acceleration, everything is loaded to take up the spaces between, so some noises will decrease.
    Change out the transmission and rear oils too (and inspect closely for particles); maybe a U-joint or a rear bearing is on its way out. While the trans isn't too picky about what you put in there, the rear really should have a quality 80W90, GL-5 rated dino or equivalent, not a 75-140 synthetic.

  4. #4
    Day Dreaming ... happy wanderer's Avatar
    Join Date
    Mar 2010
    Vancouver, B.C. Canada
    I don't know what heavy-duty Delo 400LE is but if it is not 20-50 weight SG rated motorcycle oil it does not belong in that engine.
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

  5. #5
    Registered User dieselyoda's Avatar
    Join Date
    Mar 2013
    Winnipeg, MB, Canada

    Motorcycle oils and dry clutches, a waste of money.

    Most quality motorcycle oils are blended for a wet clutch or integral clutch/transmission. Those oils have friction modifiers and such specifically for the wet clutch. Think of them as a combination of automatic transmission oil and engine oil.

    I would caution against DELO as the acronym is Diesel Engine Lubricating Oil. There are tons of smart fellers on these forums and I don`t want to be a smart ass, but there is a significant difference between `S`oils and `C`oils.

    Regardless, in my experience, oil viscosity has little to no impact on mechanical problems. Banana peels...............they do quiet gear systems enough to get them down the auction line-up.

    And, I don`t want to post my comments and see responses about the best oils or a spreadsheet about how oil affects fuel economy.
    1997 R1100RT (Restored Basket Case) , 1981 KZ 440 LTD (Restored Basket Case, my baby, fast, fun)
    3xR90/6, two just sold, one for a sidecar. 1983 K100RS (Cafe now)
    Very Rough R80RT. 1987 K1100RS (freaking hooped I think)

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