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My "new" project Yamaha 125 twin dirt track racer

  • Thread starter Thread starter madjack57754
  • Start date Start date
M

madjack57754

Guest
Rescued a 1969 Yamaha AS-1 125 twin that is mostly in boxes as it was set to go to the local landfill.
The cool part is it has the complete factory GYT kit for dirt track or road racing with it. The engine was assembled in 1970 using the cylinders, heads, magneto, crank, amal carbs, dry clutch, and 7 speed transmission from the GYT kit. The crank is set up as a "twingle" in that it has both pistons firing at the same time like two singles using a common crank. They vibrated more that way but got much better drive out of corners with more torque.
The bike was being assembled by the nephew of a friend when he died in an accident. The bike was stuffed into the rafters at his uncles in around 1973 and forgot about. The motor was assembled but never started.
I was helping clear out one of the out buildings with my friend's widow when we found the bike. It was one of those take it or load it to haul to the dump deals...
 
I feel that this one found me to be the caretaker of another racers legacy. It is set up to be a short tracker and will stay that way.
Shouldn't take a lot to get it running, as most of the pieces are there. Anything missing will come from a couple of friends or my parts stashes. When finished it will be donated to the national motorcycle museum in Sturgis SD (after a few laps on the Sturgis Short track. I still have my steel shoe)
 
That is very cool! Good find! The bodywork looks like Champion stuff. Enjoy your project. A "twingled" 2 stroke twin... How cool is that! :D:D:D
 
Awesome. Great project and rescue. Can't wait to see some video of that baby. We want step by step pics and updates!
 
Ok you definitely have to do this... and I definitely have to tune in to the build :)

When you do the few laps, we want video too!
 
Moving ahead with this. Rooting through my spares crates has yielded a Champion fork brace for Betor forks and a call to Mickey Dymond got a set of Kosman trees, and the correct rear brake pedal donated. A couple of local guys promised the proper yellow number plates, Magura dirt track bars, clutch lever-perch combo, and a early spool throttle assembly.
 
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What a cool little bike. I used to love the sound of those little twins with the stock 180 degree crank. Those open chambers will be LOUD! My brother had a DT1 and a Bultaco Pursang with un-muffled stingers. Loud!!
 
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