Prototype Yamaha TTY500 trials bike

[Michael Moore]

Here's a page from Tom Beasley's "The Mick Andrews Book of Trials" showing an early stage of a Yamaha prototype trials bike using the XT/TT engine:



I saw mention at Trials Central that Andrews told someone the plan was to use a low-mounted fuel tank with a pump to raise fuel to the carburetor to lower the center of gravity. I think I've got an English bike paper which mentioned some rivalry between Sammy Miller and Andrews over who'd get the first 4 stroke trials bike to the Scottish Six Days. I suspect the Yamaha didn't get much farther along than these photos as I've seen no photos or other evidence that the bike was completed.

cheers,
Michael

[David Lahey]

By the look of the frame near the swingarm pivot and at the steering head, they started with an OW10 frame

[getahusky]

I'm not sure if you guys had spotted this clip but from 1:45 you get to see Mick's Yamaha 500.

https://www.youtube.com/watch?v=0-LXPG6_lS8

[FourstrokeForever]

Yes, I did spot the 500. You get another look at the end of the film as well. Looks like it had some type of "air" shocks on it?