Yamaha Motorcycle IZUMI Drive Chain ES520Hx100 10034336956731 Replace this exhaust valve when

Replace this exhaust valve when the old valve is burnt

and reserve/ON/OFF function

Replace this big bore oversize piston ring set when rings are worn

Yamaha XS650 (1976-81)

and access angle before spreading or compressing the ring

Yamaha Motorcycle IZUMI Drive Chain ES520Hx100 10034336956731 Replace this exhaust valve whenIZUMI Drive Chain ES520Hx100. This 520 drive chain transfers power from the countershaft sprocket to the rear sprocket; size it to match your gearing and wheelbase. Replace this drive chain when the old chain is stretched, kinked, rusty, tight in spots, or wearing the sprockets unevenly. Fitment Compatibility Universal Custom: Universal Custom Product Details Final drive chain Chain size: ES520Hx100 Sold individually XS650Direct part number: 56 0092