By fitting the hcr reed valve spacer you will increase the bottom and mid range rpm torque of your SX85 or SX105.
Hardcore racing has been tuning 2 stroke engines for 25 years with many British and European championship winning engines, the Yamaha YZ65 responds well to the cylinder having changes to its flow and port timing please choose a option of either purchasing a new cylinder or sending us your cylinder to be re ported
Haan rear wheel 19-1.85 Yamaha YZ250F 2009>
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