Question about 2006 Triumph Bonneville T100

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Have a heavy rattle in bonnie 865 motor when hot only 4,300 klm

When my bike is used in realy hot weather i get a heavy rattle now and then. it seems to be from the top end. Have only done 4,300 klm

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  • whitehorse21 Jan 03, 2009

    Have always run on 91. yesterday was 37c. Anyway have just drained fuel and filled with 98.Today is slightly cooler but have just tested ,will moniter on a hot day

  • Dick
    Dick May 11, 2010

    That sound is most likely detonation. If it happens mostly under heavy load (higher gear, slow speed acceleration with a lot of throttle) detonation is very likely. Try a tank of premium fuel 91 octane (US) or higher, see if the problem goes away or is less.

  • Anonymous Mar 31, 2014

    Rattle from head


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Pinking is usually a sign of a low octane fuel, altitude or high temps that can sometimes be lessened by retarding the ignition timing a few degrees i.e. the plug sparks when the piston is closer to TDC. This is not always easily possible on modern bikes with the ignition advance/****** controlled by an ignitor box rather than a mechanical points type set-up.

Severe pinking for long periods can & will burn a hole through the piston crown. If a higher grade fuel is unavailable, try finding some sort of octane booster to add to the fuel (off road shop?).

Posted on Jan 03, 2009

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Starting issue

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