I´m planning to rebuild the engine in the end of the season with new bearings and seals, new 50cc cylinder, new hi comp o-ring head, new complete piston, 15mm Bing, new exhaust, new EBRs, 13/43 gearing. It´s a Z50 engine with 2-speed manual hand gear so it got potential to be very strong. The only mod i have done so far is to drilled and tap the automizer to fit 5mm Dellorto jets and dremeld up the airbox to fit Dellorto airfilters, derestricted the cylinder and pipe. I will post more pictures on Instagram. (@alsing78). http://www.youtube.com/watch?v=smtWr1k5GLo