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Thread: vfr400 nc21 motor backfiring

  1. 22nd February 2012, 21:39 #1
    driftkart
    driftkart is offline L-Plate Rider
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    vfr400 nc21 motor backfiring

    My VFR400 powered go kart has just started to back fire abit when reving also when driving at the top of each gear. Seems to run wee rough.

    Any idea's?

    It is fuel pump feed also.

    Thanks in advance
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  2. 23rd February 2012, 00:11 #2
    Sable's Avatar
    Sable
    Sable is offline Scumbag junkie-looking biker
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    clean balance carbs check fuel pump exhaust tight, no leaks
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  3. 23rd February 2012, 04:59 #3
    driftkart
    driftkart is offline L-Plate Rider
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    Quote Originally Posted by Sable View Post
    clean balance carbs check fuel pump exhaust tight, no leaks
    Found slight crack in exhaust?

    Ill drain carbs today
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