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Frictional Drive (CFD)
The Cobra Frictional Drive (CFD) is essentially a slip clutch that dissipates torque
spikes transmitted from the rear wheel to the rest of the drive line and engine.
Instead of these torque spikes potentially damaging internal components, the
CFD allows the transmission to slip with respect to the engine. For this to occur,
the CFD must function properly by ‘slipping’ between a minimum torque value,
and a maximum torque value.
The slip torque of the CFD should be checked every 5 hours of operation.
Slip Torque
Ft-lb N-m
Minimum 50 67
Maximum 125 169
With the clutch cover off, you can check the slip torque by ‘blocking’ the primary
gear with a suitably strong device, or Cobra tool EAMU0004, and then rotate the
blue CFD nut counter clock-wise with a torque wrench observing the reading
when the nut (and shaft) turn.
If you do not have the capability of checking for proper slip torque, you should
replace the friction papers and the load spring (Bellville spring) every 10 hours to
ensure proper operation.
NOTE
To loosen and tighten the blue CFD nut, use a strong wooden object (large
hammer handle) through the spokes of the rear wheel as a brace against the
swingarm to stop transmission shaft rotation.
CAUTION:
The blue CFD nut has left hand threads which require clock-wise rotation to
loosen.
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