How do I know when it's time to change the chain?

[Rathbone]

Someone looking at my ATV pointed out that a little bit of rubber was sticking out from one of the links.  I didn't even know there was rubber in the chain.  It doesn't look like a big deal, though.  When is it time to change the chain?

[AintSkeered]

Get a hold of the service manual, it describes the allowable specs for the chain. You need to measure between the pins with a caliper and see if it's stretched out too far. Another clue is if your sprocket teeth look more like shark fins.

[Rathbone]

Thanks!  The sprocket looks like new, but I don't have the manual.  I'll have to see whether I can download it somewhere.  BTW I have a 2005 Yamaha Raptor 350.

[AintSkeered]

If that's the original chain, you'll likely need replacing of the chain and both sprockets. However, if it can still be tightened to specs, forget about it.

[Rathbone]

I don't think this had many hours on it when i bought it but I'm making up for that.

[zman03]

when in doubt switch it out!!!   nothing like new parts!!!   corrosion is always a sign of an old part.  I have an 8500lb. tensile strength X-ring. you gotta lube it everytime before use and clean after and lube again    it should last you a pretty long time 

[duroc825]

Another way is to grab the chain in your hand and shake it. If it sounds like a bag of marbles it means the rollers are worn out and it's time to replace it. The rubber is from the o-rings between the links and pins. Don't buy a cheap replacement, in my opinion there is no "good" cheap chain. As reasonably priced sprockets are ya'd be better off to change them too.

[svtbolt04]

chain and sprockets should always be changed together.

if you were to remove the chain and hold it straight out so that the links are now making a bridge type, the chain should be fairly straight and not making an arch towards the ground. the more it archs, the more likely it is worn out.