New 80cc Install on Mountain Bike

Discussion in 'Introduce Yourself' started by jrnapsdb01, Jun 19, 2008.

  1. jrnapsdb01

    jrnapsdb01 New Member

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    Hello everbody,
    I am new to the world of bike engines. Have been working on my 80cc mountain bike project for 2 days now. Chain still falling off, had to move all bike cables from under gas tank to sides of bar and reset and trim all cables. Have not yet experienced the first test ride due to chain problems. I was exicited to get the kit, but now am starting to get a bit frustrated...
     
    #1 jrnapsdb01, Jun 19, 2008
    Last edited: Jun 19, 2008
  2. Dave31

    Dave31 Moderator
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    Welcome to the forum, glad you joined us :D

    Are your sprocket's lined up ? Is the tension in the chain correct ?
    You should have at least 1/2 inch of play in the chain.

    Have any question's just ask, alway's someone here to help out.

    When you get everything just right, you will really enjoy your motorized bicycle. I think most of us had trouble when we first started out...it get's better.

    :ride2:
     
  3. deacon

    deacon minor bike philosopher

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    Most of us had to remove a couple of links from the chain to make it fit. They send a little extra usually so you have enough. If that is the case and the chain won't get tight you need to just remove a couple of links then reinstall the master link.

    When you install the master link make sure the clip is facing toward you not toward the r motor. If you need to remove chain there are a couple of threads to explain it. If you can't figure it out ask and someone will explain.
     
  4. thatsdax

    thatsdax Member

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    Hi.. Welcome.. And.. For starters... There is no 80cc...

    There is no such thing as an 80cc kit. The largest produced is a 70cc. If you bought from someone that says they are selling an 80cc kit, then.. Beware... As for your install. Do you have any pictures you can post? This would help us help you if you have any pics. Thanks.. Enjoy the ride...
     
  5. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Welcome....

    Look down the top run of the chain from the rear...do the sprockets line up?
    Is the wheel straight?
    3/4" of play in your chain at the loosest part?
    Tensioner running straight with the bottom chain run?
     
  6. Ilikeabikea

    Ilikeabikea Moderator
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    Welcome to the forum. Like everyone else has said. Check your alignment. Make sure it's really straight. Motorized bicycles are blast once you get all the bugs worked out. Glad you joined us.........................
     
  7. deacon

    deacon minor bike philosopher

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    Also I threw my chain a dozen times because my bearing nuts weren't tight. the wheel wobbled and I didn't know it.
     
  8. jnothem

    jnothem New Member

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    I too am new too motorized bikes... One thing I quickly realized is not everything goes the way as planned. Be patient, give it time. Take your time building and fixing the bike, that way you learn more about how things work.
     
  9. drmike176

    drmike176 New Member

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    hello from oceanside ca. i'mtrying to install my 50cc on a mountain bike.
     
  10. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    What issues are you having my friend?
     
  11. drmike176

    drmike176 New Member

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    My issue has been dealing with the front motor mount and the larger frame. I just looked at the on line directions. I see to use longer studs. I was wondering if I could just ease the old ones out or this a pulling operation. thus threading the holes.
     
  12. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    The stock studs will just unscrew. They still won't (usually) ebwide enough to clear and there are several ways to get around that.
     
  13. drmike176

    drmike176 New Member

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    I was thinking if i just do a little filing on the frame without putting stress on the frame this could work. Otherwise add some pipe to the frame that would fit. I looked at that over the weekend and did not like that system. Has anyone come up with an idea?
     
  14. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    There are several ways....one is to run the stock mounting studs through a piece of plate steel and then drill holes outside and above or below those that are far enough apart to clear your frame, then fasten it to the frame with a muffler "U" clamp.
     

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