I finally got out in the shop, and the engine should be ready to fire in a few weeks. Its got: arc rod, new ring set, dynocam somethin or another, billet lifters, 20# springs, split locks, copper head gasket..
Still not sure what to do to mount it up in the minibike, its gotta tilt at least 7degrees forward.
This was a generator spec engine so it had a tapered shaft like the crank on the left. I resized crank and cut a keyway. The finished shaft came out real nice, its as good as a factory one.
Little bit of overlap.........
I used a carbide tipped bit in the lathe to set the valve clearance, one thousandth at a time. The billet lifters needed some trimming as well and I used the same setup.
:laugh:Naw, it wont last:laugh: I was just messing around.
I split the crankcases on a old Yamaha IT175 dirtbike a few years ago, and the inside of the case had the rebuild date and the guys initials engraved in it fron 25 years ago. that was kinda neat.
I origionally wanted to use the promod jack shaft kit. But due to the setup of the engine I chose a yerf dog plate i got from 125cc crazy. I elongated the holes to allow adjustment of the primary chain.
I used a scrap from the local aluminun supply warehouse in the city for the mount plate. Its milled to a seven degree angle so the exhaust and carb are level.
Before I start drilling anything Ill place a order for the jackshaftshaft and sprockets chain and clutch from OldMiniBikes warehouse.