A Honda 125cc drag racer:
A Yamaha two-stroke drag racer that was built and run by Performance Machine. Check out their old school Flickr page.
I’m guessing it’s a late-60’s 350cc R3 motor. Anybody know for sure?
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Check out http://classicbikes.actieforum.com/photos-japanese-classics-f7/yamaha-350-two-stroke-twins-t1457.htm There are some 400’s toward the bottom of the page.
thanks, ole! there are some great pix there.