80 cc skyhawk making NOISE! ....help

Discussion in 'Motorized Bicycle General Discussion' started by jkflyer, Jan 11, 2014.

  1. jkflyer

    jkflyer New Member

    Jan 4, 2014
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    Hi, I'm new to motor bicycling so I thought I'd get some advice before I start turning screws lol. I've recently stripped and remounted my girls gt avalanche with an 80cc Skyhawk for a new paint job. All is back in place, it starts and runs well. However, I'm heaing a screeching and clanking coming from the engine. I'm assuming its the clutch??? Because as well when I push the bike with the clutch held in the pedals still spin and there seemed to be grabbing as if its still engaged??? Again I'm just guessing.
    Does anyone know what the problem could be?
    And how could I go about fixing the problem?
    Advice would be MUCH appreciated.
    Thank you
  2. crassius

    crassius Well-Known Member

    Sep 30, 2012
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    likely to be clutch cable adjustment, but check for chains rubbing and all that kind of thing
  3. 2door

    2door Moderator
    Staff Member

    Sep 15, 2008
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    Have you lubricated the gears on the right side? How about the clutch actuating parts, cam in the cover, bucking bar and ball bearing? Those can all be a source of noises if not properly lubricated.

  4. mapbike

    mapbike Active Member

    Mar 14, 2010
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    Make sure clutch cable is properly adjusted so that when clutch lever is pulled the clutch wrm moves far enough to actually disengage the clutch and as 2 door mentioned make sure to have a moderate amount of good grease on both ends of the bucking bar and just a dab. (Pencil eraser) size dab on main gear on clutch side, to much grease will give you a slipping clutch if it slings off and gets on the pucks so make sure not to get to much grease on that main gear.

    Best wishes....

  5. KCvale

    KCvale Well-Known Member

    Feb 28, 2010
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    First there is no such thing as an 80cc, the bore and stroke is 66cc, the 80cc propaganda is Chinese BS from years ago but vendors still use it because it makes the engine sound bigger ;-}

    But back to the 66cc Skyhawk...
    Do you hear this clanking siting still with the engine running?
    If not your problem is one I have seen in every new 'parts in a box' Skyhawk kit with 415 chain, the chain is hitting the front of the clutch cover when it moves.

    This is easy to verify, pull the left clutch cover off and look inside, you will see scratch marks on the flat side that goes towards the Magneto cover.

    The fix is to just dremmel, grind, or cut the area where the chain hits a little ;-}
  6. freebill

    freebill New Member

    Oct 28, 2013
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    yes kc, but it wears a slit soon and the high speed scrapping noise gos away, and it runs faster,lol,,, found the same prob when i mounted my gt5 with 36 tooh rear and 415,my cover has a wear slot but do'nt seem to afect it any, just adding my 2cents

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