Requirements for using this kit.
Please read through this list carefully. If you, or your bike, do not meet these requirements this upgrade kit is not for you.
You must:
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be an experienced bicycle mechanic
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be an experienced motored bicycle mechanic
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have a typical Chinese "Happy Time" 2 stroke engine kit, displacement doesn't matter
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have a standard square-taper 3 piece bottom bracket, conversion kits are available here
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have a chromoly or quick release rear axle, standard steel axles will bend
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have a typical mountain bike V-frame, but will also work on most "cruiser" style frames
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have no greater than a 1 1/4" seat tube
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have a quality rear derailleur, internal hub shifter or NuVinci hub