Boyou
We have built quite a few of these spirited trackers based on the Yamaha Scorpio. A proven rock solid performer they are a blast to race around on.
We built Boyou slightly different using a vintage CB200 tank and fitting an aluminium panel to the central depression. Exhaust gases exit via a stainless reverse cone shorty and a 5 3/4 Bates style headlight shows the way.