New chain. Do I need new Sprockets too?
Posted July 16, 2007 - 04:31 AM
I just replaced my worn DID 520v6 o-ring chain with a new 520V o-ring chain. The front and rear sprockets look fine. Do I have to replace them too?
Posted July 16, 2007 - 06:46 AM
What prompted you to decide that the chain was worn and needed replacement?
Out here in SoCal a good quality o-ring chain like that will last a very long time on a XR250. Like over five years, maybe more.
Posted July 16, 2007 - 11:12 AM
Posted July 16, 2007 - 11:22 AM
The old chain was missing a bunch of the o-rings (rubber bushings) and was pretty stiff.
OK that's a good reason.
Like others have said, if there is any noticable wear to the shape of the teeth then replace them. The front usually goes first so concentrate on it.
How did the o-rings get damaged? Did you use a wire brush to clean the chain? Cleaning o-ring chains is an easy way to damage them. With just some chain wax or even jsut WD-40 that chain should last for years.
Posted July 16, 2007 - 01:24 PM
Posted July 16, 2007 - 02:46 PM
Posted July 17, 2007 - 04:55 PM
I agree with that. WD40 is more solvent than lube, and some o-rings are not very solvent resistant.
As for replacing chain and sprockets as a set, I don't agree. As your chain elongates from wear, the distance between rollers gets longer, while the distance between the "valleys" of the sprocket teeth stay the same. The elongated chain will cause the tips of the teeth to curl over. This is bad. Sprocket tooth cupping, on the other hand, is normal wear and will not destroy your new chain as long as you still have a roller-to-tooth contact patch that is close to a new sprocket.
However, if you were to combine a new sprocket with an elongated chain, that new sprocket will get killed very fast.