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Backfiring motorbike

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  • 19-09-2015 12:44pm
    #1
    Lockstep
    Registered Users Posts: 9,029 ✭✭✭


    Hadn't used the motorbike in a few days and when I tried starting it up yesterday, it wouldn't turn on: no lights, no noise, nothing.
    I charged the battery overnight and it started up again only to backfire.

    Any idea what the problem might be? Want to see if it's something easy to fix before I bring it to the mechanic.


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    #2
    Mesrine65
    Closed Accounts Posts: 3,969 ✭✭✭Mesrine65


    The three main issues that result in a backfire on a motorcycle engine & exhaust system are...

    1/ Lean conditions
    2/ Intake leaks
    3/ Exhaust leaks

    A backfire is an explosion that occurs either in the intake or in the exhaust of your motorcycle, an emission system malfunction so to speak.

    This explosion should occur in the combustion chamber & when it doesn't, there is an interruption in your engine's operation.

    You might see a short-lived flame coming from your exhaust.


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    #3
    dubscottie
    Closed Accounts Posts: 854 ✭✭✭dubscottie


    Coils or leads? Old Hornet of mine did that. WD40 around the electrics or look for any cracked wires.

    If it will start in the afternoon but not in the morning (on a dry/warmish day), that could be your problem.

    My coils had cracked over the summer but didn't notice it until this time of year (more moisture in the mornings and it got into the coils)


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    #4
    galwaytt
    Registered Users Posts: 12,761 ✭✭✭✭galwaytt


    dubscottie wrote: »
    Coils or leads? Old Hornet of mine did that. WD40 around the electrics or look for any cracked wires.

    If it will start in the afternoon but not in the morning (on a dry/warmish day), that could be your problem.

    My coils had cracked over the summer but didn't notice it until this time of year (more moisture in the mornings and it got into the coils)


    ....that's more a mis-fire rather than a backfire, but worth checking anyway.

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