| There are two types of "sprocket flange" as they are called - the first is the old style one which were used upto the 996, the second being the newer style which were used on the 998 and probably some later 996 bikes too.
The old style uses a circlip to hold the spacer in place, but as this wears you can get the cush drives backing out of the sprocket and it starts to eat away at everything! I switched to a newer style sprocket (actually a flashy carrier and quick release sprockets) that has a lip in it to stop the cush drives doing this, but due to a worn circlip grove it still did it. So I replaced it with...
The newer style assembly uses a redesigned back of the sprocket flange, with one big spacer. This way nothing will move and it takes much longer to wear. It may still be worth changing to a lipped sprocket if you haven't got one just in case.
The new style sprocket flange (part #5) is 95 quid inc VAT from a dealer and the spacer (part #12) is about 7 quid, so you're looking at a touch over 100 to replace them. if you're lucky, you may be able to get one from a breakers - I paid 35 quid for the lot.  |