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I have a 22’ YZ250F. I am running the chain slack by the book but this chain seems to be wearing really bad. It’s a D.I.D gold race chain. The chain, sprockets, slider and guide all have roughly 15-20 hours on them. I’m also having to tighten the chain damn near every time I ride it. Is there something I’m doing wrong here? Or just a junk chain? I posted some pics so you can see what I’m talking about. Thanks for any input 
Looks pretty good for 15 to 20 hour to me.
Looks normal to me. I get about the same amount of time out of full aluminum sprockets so switched to steel ring or full steel sprockets.
Just out of curiosity, what gearing are you running? The wear looks a bit excessive for 15-20hrs but I’ve also seen a “top shelf” chain and sprocket set get smoked after 2hrs in a mud race. Your chain wear looks like the chain block is worn pretty badly and wearing the link plate faces. The reason I asked about the gearing is that the witness marks on the rear sprocket from the chain alternate between a full worn tooth and the next is a half worn tooth on the sides of the teeth.
13/51 is the gearing I’m running. My chain guide was a brand new Acerbis when I installed this chain. Also what would cause the witness marks to look like that? Is that an issue? Sorry if that’s a dumb question
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I guess I expected too much out of them then. I could get 35-40 hours pretty easily on my kawis
The reason I asked the gearing is it looks like you were running 13/52 because the same links were landing on the same teeth ever three revolutions of the countershaft sprocket 52/13=3. It’s a moot point because you say you’re geared 13/51. I’ve seen chain and sprockets wear more quickly when the ratio is an even number. I can’t speak to the Acerbis chain block durability but it must me pretty worn to wear the link plates that badly.
I will really look the guide over and see if that is what’s causing it. I was just curious if this is normal for that amount of hours or not. I’d love to run it a little bit longer but the wear on the side of the master link is concerning to me. I may just replace the chain and see what happens. The sprockets still have life left in my opinion
This is around 20-25 hours on this twin ring sprocket and chain. I’m on my 3rd set of sprockets and chain on my bike and it has 54 hours on it total. I should note that I normally don’t let it get this bad, but I didn’t pay much attention to the wear and then I kept forgetting to order a new setup.
Are you talking about the chain guide on the bottom of the swing arm or the buffer pad on top of the swing arm? I think the buffer pad being worn out can cause the chain side plates to wear like that. The chain rollers should run on that buffer pad and keep the links from riding on the grooves.
As you can see from the post above with the worn out steel sprocket at 20 hours some people/conditions are just harder on chain/sprockets.
Check that the chain guide is feeding the chain onto the rear sprocket at the correct height.
Wear looks normal for muddy/wet conditons and 15-20 hrs of use.
How do you clean your chain? It’s so clean for 15-20hrs
51? In your one pic the sprocket appears to have 50 stamped right on it. That wear on the blue ano would be normal on an even number sprocket. Half the teeth always land between 2 links and the other half of the teeth always land in the middle of a link.
Just the power washer and soap. I always use an air gun to blow the water off and apply maxima mppl after washes
Shit, you’re right. My mistake, It is 13-50. I could’ve sworn I went 51 but now I do remember I just kept it stock which would be 13-50 for this bike.
If I understand what he is saying this only happens if both sprockets are even numbered.
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