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2. Spring rate too high (wrong configuration with proper stack height)
3. Clutch arbor shoulder bolt is too short
4. Clutch shoe material has worn too thin
5. Clutch basket has worn too much and is too large of a diameter
With the exceptions of component failures, generally two things will occur:
1) The clutch shoes will wear causing the clutch to engage later, and
2) The springs will sack causing the clutch to engage earlier.
Typically the springs will sack at a quicker rate than the shoes will wear, meaning
that an un-tampered clutch that worked fine will ultimately hit too early at some
time. When this occurs it is easily remedied with a new spring stack or a thicker
flat shim. Because the shoes have worn, a thinner flat washer may be needed
with the fresh new springs to allow proper clutch engagement.
One thing to remember:
If your clutch is hitting fine, don’t mess with it!
Some things to remember to aid clutch life
Change oil each ride
Gear to the low side
Avoid mud if possible
(Cut mud practice to 1 lap or none)
Stay on the gas (no throttle blipping)
Run more air pressure to allow wheels to spin (helps throttle steer)
Make sure wheels spin freely (no bent rotors, dragging brakes, chain too
tight, etc
…
)
Make sure the engines pulls cleanly and strong by having properly
maintained engine with correct ignition timing and carburetion.
With the exceptions of component failures, generally two things will occur:
The clutch shoes will wear causing the clutch to engage later, and
The springs will sack causing the clutch to engage earlier.
Typically the springs will sack at a quicker rate than
the shoes will wear, meaning that an un-tampered
clutch that worked fine will ultimately hit too early at
some time. When this occurs, it is easily remedied
with a new spring stack or a thicker flat shim.
Because the shoes have worn, a thinner flat washer
may be needed with the fresh new springs to allow
proper clutch engagement.
Effective length of the shoulder on the clutch arbor
bolt (see Figure C1). Nominal is 16.00mm (0.630”).
Figure C1
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