Rekluse Motor Sports z-Start Pro Tuning Chart Yamaha YZ450F ‘03-‘04 Yamaha WR450F ’03-‘06 Yamaha YZ/WR426F ’00-‘02 198-872 Manual Revision: 041608 Engagement RPM LOW MEDIUM* HIGH Engagement Rate Spring(s) Balls Hard C150L4 27 Soft C150L4 24 HARD* C200L3 & C150L4 27 Soft C200L3 & C150L4 24 Hard C200L3 & C150M3 27 Soft C200L3 & C150M3 24 *- Medium/Hard is the recommended initial setting. Important Tuning Tip: Idle setting is a critical component in tuning your z-Start Pro. Setting your idle speed at or slightly above your Engagement RPM will yield engine braking close to stock. Setting your idle speed below your Engagement RPM will yield more of a freewheeling effect. Notes: The pattern for the 24 ball setup is 8 balls followed by 1 empty slot Empty slots must be evenly spaced around the pressure plate Definition of Terms Engagement RPM Low, Medium, High Refers to the engagement RPM of the clutch, i.e. the RPM at which the clutch starts to engage and move the bike forward. Low gives an engagement point at or below a normal engine idle speed. High raises the engagement point to above a normal engine idle speed. In general, off-road riders prefer a low-to-medium engagement RPM, while motocross riders prefer a medium-to-high engagement RPM. Engagement Rate Hard, Soft Refers to the engagement rate of the clutch. Hard gives full clutch lockup more quickly than Soft and therefore makes the bike feel more snappy. To maximize clutch plate life you should use Hard settings, as Soft settings allow the clutch to slip more.