Weeee!!! Snap! Awwww!!!!

Discussion in 'Motorized Bicycle General Discussion' started by whosworkinthegrill, Nov 13, 2008.

  1. whosworkinthegrill

    whosworkinthegrill New Member

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    Well Iv'e logged about 100 miles on my M.B. and then Snap! the studs to my motor mount sheared off right at the engine.:( Now ive got to get some easy outs and look for some better bolts than stock.
    The good news is that it is a blast to ride and it does about 30mph.
     
  2. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    Be very careful not to over torque the bolts on these kits! (& use loctite!) (^)
     
  3. tyrslider

    tyrslider New Member

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    Stainless allthread works really well; don't over tighten. Another way to keep tight w/o over tight is to use 2 nuts on each stud i.e. locknut.
     
  4. whosworkinthegrill

    whosworkinthegrill New Member

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    Yes, I think I over tightened. Im gonna look for some stainless hardened to replace with. Thanks
     
  5. biken stins

    biken stins New Member

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    China bike ? Torque in a "X" pattern. Finger tight, 6 ft/lbs, 12 ft/lbs. Check often.
     
  6. whosworkinthegrill

    whosworkinthegrill New Member

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    yup, china bike. Thanks
     
  7. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    That's for head bolts.
     
  8. biken stins

    biken stins New Member

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    My mistake Joe, good catch.
    Is there a torque chart for these engines. Have not seen one ?
     
  9. Dan

    Dan Staff
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    Thats a good idea! Personally, I just do every thing at 12.5 LBS It works for me but is not what is suggested by folks better at this than I.
     
  10. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Dan, does everything hold at that torque? Loctite or no?

    Honestly, I don't use a torque wrench. I tighten slowly until I get to that "certain resistance".

    I do strip a lot of the original stuff.
     
  11. tyrslider

    tyrslider New Member

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    Stainless is not hardened it is softer than regular steel which makes it tougher and less brittle. but don't use it in high torque apps (kit sprocket) as it likes to gall and once it does you won't get it apart w/o breaking it. Use Grade 8 on the sprocket, but SS works well on all the motor threads.
     
  12. Dan

    Dan Staff
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    Naw, nope Joe. But nothing strips. Although I have lost a motor mount or three. I retighten them the moment they fall off. Have yet to try loctite, but hear good things.
    Used the TW more to learn what the right resistance was and felt like. I couldn't tell you where my torque wrench is right now. Have read many things about proper torque. I am sure there is good reason to be more exacting. It just works for me. A wile back, I wanted to sell a tool kit just for MB building and was going to include a torque wrench, but for the most part think they are surpurfulous. Striping, snapping and general over tightening is reported a lot though. (That might be a good thread, "common first build mistakes, we all done 'em")

    Didn't mean to ramble on your thread Whoisworkin, sorry.
     
    #12 Dan, Nov 15, 2008
    Last edited: Nov 15, 2008
  13. Motormac

    Motormac New Member

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    Just a suggested bit of advice to any newbie out there is to replace all the nuts and bolts on these chinese engines BEFORE putting it on a bike,engine mount bolts most importantly.Replace all the bolts on clutch cover,sprocket cover and case halves with hardened steel metric capscrews. Loctite blue on every single bolt you see. Do this and you will not have ANY problems with stripped or loosened lost nuts and bolts.Mac
     

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