Yamaha HS1, 90cc twin crankshaft disassembly.
In this video I disassemble the HS1 Yamaha crankshaft and remove the labyrinth seal. This is the same procedure for the YL1 Yamaha twin jet 100, and the YAS1 and YAS1C 125cc Yamaha. The rods, bearings, thrust washers, and labyrinth seal are the same.
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