POS made by Rusto-bike....that is the super rare uniwheel model...they did have handle bars but that one has been kustomized by hillbilly-****-behind-da-barn bikes
I had a 305 that we raced for a couple od weekends back in the early '70s. Then I decided we really needed to flat track and it went by the wayside for a Beezer. but that's an entirely different story. Same crank case as the 250.
That was my first thought but I believe those were all 3 cylinders. Fastest bike available in its day.
The triple bikes were Kawasaki's H1 and H2 triples 550 and 750 fastest damn 2 strokes ever lived. I got a buddy that has a running 750 triple loud as ****!
I raced a "71 DS7 for a few years. The frame is almost a perfect match and Yamaha used that frame for years - even on full race bikes. If you are thinking of putting it back together, stuff up through the RD series of bikes will probably fit. RD parts are a pretty easy find. Pistons for the street models can be hard to come by, but the dirt bike slugs make great replacements and are more available. The AT1 pistons, for example, will go into any of the piston port 250 with an small over-bore. The piston port models do have specific top end parts and are not RD compatible. The botton and can interchange in most models, though. If we have guessed right, I am happy to p*** along anything I know about these things - or point you to some guys that know more than I do...
Here's the story about the bike. A friend's girlfriend owns some property in south western AZ. It is just past BFE, and she said it is peppered with old cars, and parts. She want's to clean it up, an I told her to get some pics of the stuff out there, and maybe I could help her get rid of some of it. this is some of the other stuff out there... a couple of 55 or 56 chevy school bus' an old military dodge powerwagon with a drill rig on the back a couple of mid 70 dusters a mid 60's ford 1 ton flat bed a mid 70s cadillac 4 dr. a saab, and an old datsun, and piles, and piles of ****. Nothing has an engine in it, but it may be laying around there somewhere... everything is pretty straight steel though. I might roll out there some weekend with a pickup and some tools and do some scavenging, but it's like 90 miles into nowhere! thanks for the info on the bike carcas, I was just wondering if it was worth a trip out there (proly not). thanks again for all the responses!
The frame is very similar to just about every Japanese frame from the late 60's to early 70's... The reason I say it's not a Yamaha is that Yamaha's heads always had a more square look to them, and since the late 60's the engines were black as seen on this 1970 R5, there were also ridges on the side cover... I'm thinking Suzuki because of the shape of the cylinder heads. And the frames were similar as well....
The Jalopy Journal
