seized engine?

Discussion in 'Motorized Bicycle General Discussion' started by Graham, Jan 29, 2009.

  1. Graham

    Graham New Member

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    Im following the directions for installing the motor out of the box. It comes to the point where it says I should be able to move the small sprocket within the engine with my fingers. I tried to do this but it wont budge. any suggestions?
     
  2. Clotho

    Clotho Member

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    The instructions always say that you should be able to turn the small sprocket on the motor by hand with the clutch in. I have yet to see one that this is possible on. Feeding the chain around the sprocket can be tricky as it often gets stuck out of position half way around. All I can suggest is to make sure the clutch is engaged all the way and use a screwdriver to push on the gear with the chain that you are trying to feed around it. if it gets stuck back it up and try again. Also look from below as the chain comes over the top and see if you can use a small screwdriver to keep it from getting hung up. At least this is how I do it.
     
  3. Goat Herder

    Goat Herder Gutter Rider

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    Make sure the spark plug is out compression fight ya just guessing.
     
  4. Clotho

    Clotho Member

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    Good idea!
     
  5. Creative Engineering

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    Graham,

    I always remove the sprocket cover, (clutch actuator), and the magneto cover. This is the cover to the left of the clutch actuator. The benefit is two-fold.

    1) You will be able to see what's going on!

    2) It's easier to get a wrench on the nut at the end of the crankshaft, (center of magneto)...and you're now turning the sprocket at a 4.1:1 ratio, (relative to wrench turns), which makes it a lot easier to control the feed of the chain; the sprocket will turn slowly.

    I leave these two covers off until final assembly just in-case the chain has to be removed and re-installed.

    When replacing the clutch actuator, check for fit. On some of these engines the chain rubs the forward inside edge of the actuator housing. Forward, meaning the surface nearest the front wheel. If it is difficult to re-install the housing screws, file the forward inside edge at an angle to make a chamfer for chain clearance.

    Jim
     
    #5 Creative Engineering, Jan 29, 2009
    Last edited: Jan 29, 2009
  6. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Good tips Jim.

    Also, while you have those covers off, shoot some brake cleaner in there, you'd be surprised at how much metal shavings come out of thos two areas (really bad for the mag to have metal flying around in there).
     
  7. jasonh

    jasonh New Member

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    I do it the same way Jim suggests. it's nice to be able to just turn a wrench and have the sprocket move. Make sure the spark plug is removed for easier turning.
     
  8. Norman

    Norman LORD VADER Moderator
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    all are good ideas, but I'm wondering if you guys have ever used the sparkplug wrench that comes with these engines the plug socket will fit on the nut that holds the small sprocket on I remove the sparkplug put the chain on the top of the sprocket put on that finely made china plug wrench on the sprocket nut and crank on the chain on. Tada its on with no sweat or broken fingernails.
    Norman
     
  9. Finfan

    Finfan New Member

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    What Norm said! The plug wrench and a screwdriver will turn the gear! scratg
     
  10. POPS

    POPS Member

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    " Finely made china plug wrench " Thats too cool Norm ( spew beer on keyboard) Oh well I guess It needed a good clean anyhow...POPSlaff
     
  11. Norman

    Norman LORD VADER Moderator
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    Oh boy! for the plug wrench its one thing that is almost chrome. the ones I have with these kits has a socket on each end of the wrench one end is for the sparkplug the other is for the center bolt in the gear puller that comes with some of these kit engines. Some kits do not have the gear puller or the plug wrench. Crap some don't come with all the parts needed and then some come with the parts damaged and well rusted for the early junkyard look we are all seeking for the classic look.
    I sometimes wish I had the motivation to make molds and cast them myself but I'm lazy. So someone wanting to go broke making engines here is your chance.
    Norman
     

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