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  1. M

    Is this really a 138cc

    Forgot to mention, dont kick start your bike with this kit, my compression is up somewher around the 11 or 12:1 mark. we've cracked 3 cases and kick start gears, so now we are just roll starting them, much safer. youve got to remember, these engines are based on a 50cc version. but for all the...
  2. M

    Is this really a 138cc

    You could just build your own like i have. Wiseco make an XR100 oversize piston which is 58mm with 14mm pin. Just resleeve the barrel, there will be no skirt left on the barrel to slide into the cases but it doesnt matter as the piston still has enough engagement in the barrel to properly...
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