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its a very good scooter. i customize the cylinder and the head now the compression around 13:1 the cylinder porting i make like yz 125 timing and design the transfer port, the bost port and the exhaust port but without the power valve. not enough, i changed the carburettor with keihin pwk 28 sudco. the power band feels smooth in mid rpm. but vepa big frame has a poor clucth design them put the clucth in the crankshaft make them slip too much feels like lose power.
i put air vent on the side panel for improve air flow. for dialy riding this bike feels comfortable the seat geometry make straighten your back. this bike is great!