1977 Yamaha TT. Bought her from the original owner who used it for ice racing up in Canada and dirt bike racing in Arizona. Said he’s done all sorts of events on it including Pike’s Peak back in the day. Has a 90mm piston which brings the displacement up to 540cc and up’s the compression. Aftermarket cam, carb and exhaust as well. Thing is a wheelie machine. I’ll probably turn it into a flat tracker. Has a very weird starting sequence which I’ll document later. It braps very well.