Wow! Neat find!
What it looks like to me is an early 70's Kawasaki single, maybe 100cc (looks like the same frame as my G3's).
From a cursury look at the photos:
- the pipe is a stamped 2-stroke motocross expansion chamber from the late 60's / early '70's, probably Kaw,
may even be a Green Streak factory pipe,
- fork stops have been welded on the lower frame neck to reduce turning radius, so a (full?) fairing was fitted at some time,
- what looks to be a front fairing stay has been welded onto the front of the frame and then cut off again for some reason,
- under the seat at the end of the frame, you can see where the removable rear fender hoop slides into your frame and gets retained by pinch bolts, another indication of it being a G3-style frame,
- the tank is one I've never seen - can you email or post a picture of the underside? It looks like fiberglass - is it?
Unless there is a sticker or something under the tank, it could be homemade...
- the seat could be any one of a dozen or more available at the time and may even be a real Kawasaki race seat,
- the front forks look to be Kawasaki, but measure the fork tube diameter where the clipons are to be sure. The stock G3's were only 28 mm in diameter and yours look a bit bigger, so maybe from another small Kaw? The upper triple tree isn't stock kaw either.
- front brake is from a street bike, double leading shoe, from the look of it a Yamaha that has been adapted to your bike but possibly from a Kaw 250 twin or early 350 triple (I'm not that familiar with them). If you take the wheel off the bike and the backing plate off, you may find Yamaha or some other markings.
- if you take your tank off and look at the steering neck on the eft hand side, you should see numbers stamped into the neck. G2 and G3 would be for the Kaw 90's and 100's of the area. If you find any other id, post it or email me and we talk further. I'd love to see the bike - where are you located?
If it seems funny that people would build a road racer out of a little bike, there was a pretty vibrant 100cc road racing class up into the early '70's and companies such as Yamaha even built a GYT Kit for their 100cc twin to go road racing...
Great Find!
Keep checking the attic for more parts.
Pat Cowan,
Pacomotorstuff
pacomotorstuff@cogeco.ca