Engine top end rebuild and an engine stand

Discussion in 'Motorized Bicycle General Discussion' started by Norman, Jan 25, 2008.

  1. LS614

    LS614 New Member

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    great job Norm! This has a wealth of information that I can use to better my kit and make sure it doesn't fly apart when I'm traveling at speed. I'm bookmarking this one!
     
  2. Hiigel

    Hiigel New Member

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    I am interested in clutch replacment too; mine now has over 2500 miles, but still seems ok, but I know the day will come. Are the pads just sitting in the gear ring?? Do you replace just the pads, or the entire gear?? Is there a special trick to installing the Woodruff key on the small drive gear??

    Seems you know much about these engines!

    Gary
     
  3. Elixys

    Elixys New Member

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    so Norm, what would you have done had the engine been needle bearing instead of bushings? im curious to know.
     
  4. tonynorris

    tonynorris New Member

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    hey id be careful my guy set his torque rench to the specified 12 ft/lbs and he stripped out the studs. id say 10ft/lbs is good.
     
  5. Dgad142

    Dgad142 New Member

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    thank you mb eng. kit forum
     
  6. webbee

    webbee New Member

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    Do we need a third? .trk
     
  7. Genisisonyx29

    Genisisonyx29 New Member

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    so heres my question on the top end rebuild. who sell piston for motors that have a taller crank? i know piston bikes does but it cost 27 just for the piston shipped..
     
  8. Huffydavidson

    Huffydavidson STREETRACER/MANUFACTURER

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    What are you referring to when you say taller crank ? what brand of motor do you have ?who did you purchase it from ?it would be highly beneficial if you give us more information.
     
  9. sboricic123

    sboricic123 Member

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    Norm, thanks for the great tip of using a piece of wood to hold the piston in place, or as a 3rd hand. The cylinder slipped on quite easily as you mentioned.
     
  10. maniac57

    maniac57 Old, Fat, and still faster than you

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    Your post inspired me to build a test stand of my own Norman.
    Thanks for the great clear info!
     
  11. Bohemian_Lady

    Bohemian_Lady New Member

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    I just wonder how much oil goes into the motor while re building... How much is too much? Is this a "dollop will do you" kind of situation or do I pour in a bunch and pour out the excess?
     
  12. crassius

    crassius Well-Known Member

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    I'd guess builders all have diff standards for this - I like to oil all bearings with a few drops and wipe cylinder wall with an oil-wet finger - not sure what if any diff it makes other than to make me feel comfortable with it.

    Thinking lately about hard first starts makes me wonder if porous cases are stealing quite a bit of fuel at first until they are well soaked enough to start more easily - I might start oiling the inside walls a bit on new motors.
     

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