3
Sprocket & Drum Assembly
Lubricating the chain before each track session will increase the life of the V clutch chain sprocket. A worn or
chipped chain should be replaced as it will quickly wear out the sprocket. The sprocket should be replaced when the
teeth are worn or hooked. For maximum sprocket life use a long chain with the engine set forward and with 12mm of
up and down total chain slack. This will maximise the number of teeth engaged. The V clutch sprocket is made
separate to the clutch drum and can be replaced without a new drum being fitted.
The V clutch sprocket is fixed in position by 4 off M5 x 8 CSK bolts tightened to 8ft/lb or 11Nm. Use a small amount
of Loctite 243 on these bolts.
V Clutch Shoes
The 3 V clutch shoes are made from Aluminium with clutch shoe material adhered to them. When this material
wears down or the 10mm pivot pin mounting holes wear they should be replaced as a set of 3 shoes with 3 new
clutch springs.
Warning: Do not fit mismatched worn old shoes with new shoes as performance of clutch will be reduced causing
overheating and power loss.
V Clutch Springs
The 3 springs are made from steel. They will last many hours and only need to be replaced when broken, worn,
damaged or when new shoes are being fitted. Only change springs in sets of 3 and note they have different shaped
hooked ends so only fit correct way round. See picture below.
Picture of V Clutch springs correct fitment
V Clutch Drive Hub
It is not necessary to remove the 68 tooth starter ring gear from the clutch hub if your engine is a TAG model to
service the V clutch but this is done by undoing the 3 off M8 x 10 CSK retaining bolts while holding with the V clutch
holding spanner. Starter ring gear should then just push off by hand.
V clutch shoe replacement
Remove the 3 shoe retaining pin cir-clips and washers from the shoe mounting pins and then push these pins out
from the front of clutch to the rear which will enable you to remove clutch shoes and springs. Check for wear both in
the shoe mounting pin holes and on the mounting pins. Badly worn parts will cause poor performance and failure
and will need replacing with new.
CLUTCH ASSEMBLY
Clean parts with disc brake cleaner. Disc brake cleaner comes in an aerosol can and is available at most
automotive parts stores. Avoid soaking V clutch shoe material with cleaner.
Warning: Do not use petrol to clean the V clutch!
First place each V clutch spring in the clutch hub spring retaining hole. Then place other end of spring into the shoe
spring retaining hole. This will require a pair of thin nose pliers and the spring and shoe positioned to give best
access to positioning spring into this hole and then put shoe in correct location in hub. Remember the spring has
different shaped ends so it is vital to fit springs the correct way round. See picture above or V Clutch parts drawing.
Repeat this on all 3 V clutch shoes and springs.
