2
INSTALLATION
Insert Woodruff Key into crankshaft.
Slide V clutch drive hub assembly onto taper of crankshaft. The tapers should be clean and dry. Be sure the keyway
slot in the drive hub is aligned with the Woodruff key.
Install the coned safety washer with the dome facing outwards from the engine and tighten the large hub nut to
50ft/lbs or 68Nm using holding spanner and special socket. A small amount of Loctite 243 can be used on this nut.
Warning: Do not over tighten this nut as this may cause cracking of the drive hub.
Warning: Do not hold the ignition rotor side crank nut or use a piston stop when attempting to tighten the crank
starter & clutch hub nuts as this will cause crankshaft to be misaligned & possible engine damage.
Warning: Do not use anything wedged in starter ring gear teeth and crankcase when attempting to tighten the
crank starter & clutch hub nuts as this will cause stress and possible starter ring gear damage/failure.
Install the internal thrust washer with inner radiused edge facing towards the engine. Due to manufacturing
tolerances, three sizes of the internal thrust washer are available. It is important to install the washer that provides
correct recommended clearance to allow the chain sprocket & drum assembly to spin free after the crank starter nut
is tight. The end float clearance of 0.25mm - 0.38mm for the sprocket & drum assembly is recommended.
Apply a small amount of quality grease to the thrust washer and to the roller bearing and then slide the bearing onto
the crankshaft.
Warning: Any excess grease will likely cause power loosing clutch slip and overheating so be careful with the
amount applied. This will also apply to chain lubrication if sprayed in the V clutch area.
Slide the sprocket & drum assembly onto the roller bearing and over clutch shoes. At this stage the chain sprocket &
drum assembly should spin freely.
Install the external thrust washer with its inner radiused edge facing the starter nut and apply a little grease.
Place the starter nut on the end or crank and tighten to 15ft/lbs or 20Nm. The use of the V clutch spanner holding
tool is to prevent the crankshaft from turning while tightening the starter nut or an impact gun set on a low pressure.
Warning: Do not hold with the ignition rotor side crank nut or use a piston stop as this will cause crankshaft to
be misaligned & possible engine damage.
Warning: Do not use anything wedged in starter ring gear teeth and crankcase when attempting to tighten the
crank starter & clutch hub nuts as this will cause stress and possible starter ring gear damage/failure.
Once the crank starter nut has been tightened, check that the sprocket & drum assembly spins freely and then
measure and adjust if required its end float clearance with a feeler gauge. 0.25mm - 0.38mm is recommended.
Different thickness internal thrust washers (1.5mm & 1.7mm & 1.8mm) are available to adjust this end float.
MAINTENANCE & REPAIR
Due to the extreme demands of racing, it is important to properly maintain your V clutch in order to obtain maximum
performance and reduce risk of clutch breakage or clutch slip.
Roller Bearing
The V Clutch is a dry clutch and therefore has no oil lubrication supply for the roller bearing. It is necessary to
ensure that the roller bearing and thrust washers are always lubricated with quality grease otherwise as excessive
crank wear could occur.
Warning: Any excess grease will likely cause power loosing clutch slip and overheating so be careful with the
amount applied. This will also apply to chain lubrication if sprayed in the clutch area especially with the
older model clutch drum with the through lightening holes.
Warning: Do not use Copper Grease for this lubrication.
We recommend that this roller bearing should be replaced whenever the chain sprocket is replaced.
