hi,guys…i am ride a T-rex 150. i want to make it go faster…but stay at 5 or 6000 rpm only.
no big bore kits. just cylinder head modifile or carburetor and transmission gear change would be best!! any idea?? 
hi,guys…i am ride a T-rex 150. i want to make it go faster…but stay at 5 or 6000 rpm only.
no big bore kits. just cylinder head modifile or carburetor and transmission gear change would be best!! any idea??