Clutch cover screw size?

Discussion in 'Motorized Bicycle General Discussion' started by OCC, May 6, 2013.

  1. OCC

    OCC New Member

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    Somehow when i was riding my 80cc i didn't tighten the screws to my clutch cover after rebuilding it. 'm hoping i can just buy these 3 screws at a local hardware store just wondering what the size was.
     
  2. crassius

    crassius Well-Known Member

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    same size as the two you have left - carry them with you
     
  3. OCC

    OCC New Member

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    all three fell off so unfortanatly i have no referance point otherwise i would unless theirs another part of the bike im unaware of that has the same specs as the lost screws.
     
  4. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

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    Your 80 cc is 66 cc.
    They are 6 mm 1.0 which is the same thread as the real clutch cover which has 5 of them.
    The 3 bolt cover is the sprocket cover.
    The motor mounts, intake and exhaust are the same 6 mm size.
     
    #4 MotorBicycleRacing, May 6, 2013
    Last edited: May 6, 2013
  5. maniac57

    maniac57 Old, Fat, and still faster than you

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    I'd replace them with allen head bolts for more life and easier tightening.
     
  6. 2door

    2door Moderator
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    Ditto, except the you might find the heads of the Allen head cap screws are a little too large to fit the counterbores where the original screws went. In that case you can either grind the heads to a smaller diameter or go back to screws which have the proper size heads.

    And yes, they are 6mm X 1.0 thread. One (top right hand side looking at the left side of the engine) is longer than the other two because it was made to mount the kit supplied chain guard.


    I'm wondering how you got home if all three screws fell out. The clutch would have been engaged with no way to disengage it. And, if that clutch actuator cover fell off you need to make sure there is still a steel pin protruding from the center of the drive sprocket and the ball bearing that goes in ahead of it.

    Tom
     
    #6 2door, May 6, 2013
    Last edited: May 6, 2013
  7. OCC

    OCC New Member

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    Thanks for telling me to check my pin and ball, good thing i put extra grease on it before i put it back together, i think thats why it stayed in and the only way i was able to kill the bike was with a kill switch the clucth must have been engaged the whole time....
     
  8. Nashville Kat

    Nashville Kat Active Member

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    I replaced all of mine with allen bolt TITANIUM screws- and NO GRINDING-

    search ebay - here:
    http://www.ebay.com/itm/10x-M6-16mm...ltDomain_0&hash=item1e65c903c2#ht_1436wt_1255


    Did both engines when I had to roll the bikes up a flight of stairs
    a pittance of the weight of steel and the allen key looks cleaner and tightens easier

    There's actually several more on the motors one could replace with titanium- several longer ones-
    and it's a little chunk of weight
    with a 415 Industrial/Trike chain at half the weight
    and losing the stupid heavy steel chain tensioner
    and a featherweight alloy rear sprocket
    bolted directly to a drilled flip/flop or disk brake freewheel hub to lose the heavy rag joint as well

    it takes a kit down in weight actually quite a bit-
    still looking for a lighter gas tank- cap at least especially
    some day I'm going to get a scale and weigh it all

    But a bike that barely weighs 40 lbs that can go 25 or 30
    and rolls like a road bike
    is a pretty efficient machine

    .xx.

    Took the photo of the old '48 dodge near my house
    while out on the old '67 Peugeot PX10 here in Jacksonville a few weeks ago
     

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    #8 Nashville Kat, May 7, 2013
    Last edited: May 7, 2013
  9. crassius

    crassius Well-Known Member

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    the cover with only three screws is the sprocket cover, not the clutch cover - two are the same size and the one up no the right is a bit longer to hold the chain guard
     
  10. sboricic123

    sboricic123 Member

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    I'd recommend you use Loctite thread sealer (medium strength) too when you get the replacement bolts. Bolts won't come loose then from the vibration.
     

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