1975 Yamaha YZ 80 Crankshaft modification and build

In this video I modify the crankshaft for the use of thrust washers on both sides of the connecting rod. Engines before 1977 did not have thrust washers engines after did. All new crankshafts after 1977 are presumed to have thrust washers and were the same part number as the older ones and could be uses on them also.