I recently aquired a bike and cant seem to find out exactly what it is. This is what I know. It's a Yamaha 125, Red and silver, VIN# Y21-179320, INJECTION SYSTEM on right, tool and batt cover on left, YAMAHA on tank with chrome sides, has turn signal switch but no lights (holes have rubber plugs), kick start on right, front fender is chrome and has bars going to front and rear, 12v system, muffler is tapered on th end, choke is on left hand lever, flap only on rear fender, heal toe shifter, 3.00-16 tires, speedo is part of headlight and goes to 90mph.
It is a YA6 "Santa Barbara" USA model, as pictures in the general catalogue. Models for 1968 were: YR2-YR2C-YM1-YDS5-YDS3-YDS3C-DT1-YCS1-YCS1C-YA6-YAS1C-YL1-YL1E-YL2-YL2C-YG5T-YJ2-U5-U5E Aand TD1B roroadracer. Ludy Beumer