I put on 33.5 miles today with a top speed of 40.26mph. Stock sprocket, worked over piston and cylinder. Smiling the whole way with lots of thumbs up!
My friend Ed hit 53mph drafting a truck, w/his China doll engine. Slight mods and shiftkit.welcome to the 40+ crowd!
as far as the fastest on level ground, i hit 54 with a heavily modified china, gps'd and witnessed by neil (motorbikeracing) and the aleman.
hit 62 on the same bike drafting a truck, gps'd with my phone, and then blew the motor apart.
there's lots of guys hitting 40 on china dolls. just takes the right mods and some balls.