Uncontrolled reving - BMW F800 Riders Forum & Registry



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  1. #1
    Kylerbry's Avatar
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    Joey Bryant
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    So my bike sat all winter. Replaced the battery and when I give bike throttle and roll off the bike revs up to 3K and then back down on its own. I was told it could be Air intake Valve, but also that I should replace my spark plugs first. Any advice or confirmation is appreciated.

    Sent from my SM-N976V using Tapatalk

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  3. #2
    Points: 10,851, Level: 72

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    If the bike is revving on its ow, or holding revs its the sign of an air/vacuum leak (usually). Spark plugs aren't the cause of this - they only fire when told to do so.

    Take off the air box, clean the idle control valve & check the idle control valve vacuum hoses and are in good condition. Whist you are there check the throttle body valves close full when off the throttle, and snap shut when releasing the throttle.
    BMW F800ST, 2010, Black, Fuzeblock, Sat Nav, BMW Tank Bag, Givi Touring Screen, Denali Spotlights, Denali CANSmart, Wunderlich Crash Bars, 55K Miles & counting 

  4. #3
    Daboo's Avatar
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    Quote Originally Posted by Kylerbry View Post
    So my bike sat all winter...
    Has your bike become a rat hotel? Sometimes the cute furry little things set up residence in the innards of motorcycles, making modifications to suit the bike's new users.

    Chris
    Elnathan - 2014 BMW F800GT
    IBA# 49894 True Rounder = 0-20's - Rounder -- to -- 100's+ Red Hot Rounder

    John 14:6 

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  6. #4
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    It happened on mine after a particularly cold set of days in January when the lows at night were around -5C to -10C, I think. But in my case, I think the throttle cable was binding, coz when the bike was revving by itself, the throttle was slack. I turned the bike off and tried opening and closing the throttle a few times, and then it behaved OK.
    I'm assuming it was due to some variations in metal contraction and subsequent expansion because I also had a lot of trouble sliding the key into the ignition slot that day.

  7. #5
    anjelli's Avatar
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    Does the throttle feel any differently than it did when you were riding frequently? Turning handlebars side to side make any difference? Any changes take place in the handle bars, grips, controls, etc? It's not the spark plugs, that is pretty goofy diagnostics.
    Greg, not Ang

  8. #6
    danomar's Avatar
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    As above, I first would check the throttle cable. The way it is routed on the F800 series makes binding likely.
    My spoon is too big. 

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