Rekluse Motor Sports z-Start Pro Tuning Chart Yamaha YZ450F `03

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.