Jason,
About a year ago, I started tossing around the idea of building a modernized, air-cooled MX all-purpose bike. The bike would be a smaller bore, nimble, easy to start, and fun to ride.
It started with the Yamaha Blaster motor, which went unchanged from 1988 until 2006, when the EPA rules put the knife in the Blaster's heart. Yamaha sold a ton of these machines, though, and I began searching eBAY for a complete motor to begin my project, which I had named "The YZ Retro." I secured one for about $375 and it was on to step two: securing a YZ125 rolling chassis.
This is a simple machine with 30 to 35 hp, with all the modern components, and a stone age simple motor.
That is pretty much a run down of my YZ Retro bike, which has a running weight of 220 pounds.


