Engine chain not lining up

Discussion in 'Motorized Bicycle General Discussion' started by lolitsdaelan, May 29, 2010.

  1. lolitsdaelan

    lolitsdaelan New Member

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    So I just got a SkyHawk engine, mounted it to the bike, and installed the sprocket. I quickly noticed that the chain does not line up with the sprocket at all, and even runs into the frame itself. How is this supposed to be mounted????
     
  2. corgi1

    corgi1 New Member

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    any pics?......................
     
  3. lolitsdaelan

    lolitsdaelan New Member

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    I'm an idiot, got it figured out.
     
  4. freewheeling frank

    freewheeling frank New Member

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    good fer u stay here
     
  5. Don Quixote

    Don Quixote New Member

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    I have the same problem. Enlighten this idiot. How did you fix the alignment?
     
  6. Starchalopakis

    Starchalopakis New Member

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    As am I. The chain keeps slipping off the rear drive sprocket. Just an alignment issue I assume? How do I fix this?

    edit. and this is just with the clutch in pedaling, havent got her fired up yet.
     
  7. lolitsdaelan

    lolitsdaelan New Member

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    Well I haven't actually fired it up yet, so I'm hoping I'll be OK. I had apparently bent my fender a little when I was painting it, I just had to bend it back a little and it gave me the clearance I needed.
     
  8. bairdco

    bairdco a guy who makes cool bikes

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    most times you'll have to cut the fender for clearance. even if you get it all set up and think it's gonna clear, as soon as you fire it up the chain jumps around and rubs on it.

    as far as sprocket to sprocket alignment, it's tricky, but it can be done.

    sometimes it's as simple as adding a washer or two between the hub and the frame on the engine side, and other times you might need to actually "spread" the frame.

    here's an article on that: Bicycle Frame Spacing

    i'm gonna copy and paste the last paragraph in that article, just for a CYA;

    "This job is one that isn't for everybody, but it's not rocket science either. Many shops are reluctant to undertake this sort of operation, either because of fear of liability or because they want to sell you new bike. Although it seems fairly alarming to deliberately bend your frame, it is really not that cataclismic an operation, and can be very worthwhile if it allows you to keep riding an old friend, with the advantages of a modern drivetrain."
     
    #8 bairdco, May 30, 2010
    Last edited: May 30, 2010
  9. Cabinfever1977

    Cabinfever1977 New Member

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    Most cut a notch in the fender where the chain goes by.
    I left out one rubber and put the rear sprocket up against the spokes for a perfect alignment. The chain tensioner also helps the chain to go straight to the rear sprocket.
     
  10. Parbed

    Parbed New Member

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    Yes in most cases I leave the one rubber disc out and go with direct mounting to the spokes/hub.
     
  11. lolitsdaelan

    lolitsdaelan New Member

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    Yeah I had to the take the second rubber isolator out and put the sprocket in backwards (chrome side out). Then with a little work on the tensioner, I managed to get it all to line up pretty well. Although now I have a whole new world of problems, but I'm gonna start a new catch all "daelan is an idiot and here are his questions thread" to keep them all in one place :p
     

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