Major issue with drive sprocket

Discussion in 'Motorized Bicycle Trouble Shooting' started by hammmersmashface, Jun 13, 2018.

  1. hammmersmashface

    hammmersmashface New Member

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    So am i totally screwed? Today i was riding my flying horse 66/80cc to work when my chain popped i stopped to repair it but the drive sprocket wouldn't move so i took off clutch cover and there were two links mangled in there preventing it from moving so i got em out and that's when i seen that the chain was rubbing behind the sprocket and wore a hole right into what i think is the crank case.. engine is just a month old..doesn't even have 60 miles on it...now my question is ...is.my motor totally effed? Or is there hope
     
  2. crassius

    crassius Well-Known Member

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    not sure if there is a pic here somewhere, but you can make a cut with a hacksaw just above the rub mark and just below the rub mark about 1/2 inch deep, then grab the piece in middle with a big pair of pliers and just break it out - no big deal
     
  3. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

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    That is in FRONT of the sprocket,
    I think he means BEHIND the sprocket which may be into the clutch shaft area
    or possibly into the case whuch I have seen before.
     
  4. hammmersmashface

    hammmersmashface New Member

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    Correct behind the sprocket into the crankcase
     
  5. crassius

    crassius Well-Known Member

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    seen broken chains tear off back of case, but never saw them rub there - I'd need a pic
     
  6. hammmersmashface

    hammmersmashface New Member

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  7. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

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    Ha ha, I seen that before.
    Cut a thin sheet of aluminum and JB Weld that puppy up, and cross your fingers. lol

    Take a pic from the rear to show the clearance of the sprocket to the case.
     
  8. crassius

    crassius Well-Known Member

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    never seen that ever - a lot of those sprockets have a washer behind them to space the chain out a bit farther tho

    when I find one with that washer, I usually suspect that the factory just didn't get the shaft seated all the way over to that side
     
  9. Arturo Garza III

    Arturo Garza III New Member

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    You should heighten the chain tensioner. And get another chain.
     
  10. hammmersmashface

    hammmersmashface New Member

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  11. hammmersmashface

    hammmersmashface New Member

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    I did end up using some steel stick..but as luck would have it bike berry is gonna cover it under warranty
     

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