Case saver smashed my case!

Hello all first of all im not a new member for some reason i cant log in tried resting my password but still cant log in :thumbsup:

Anyway enough of that for a few years now ive had a aftermarket case saver fitted to my 04 wr 450 dident have the original one with the bike.

anyway a few weeks ago my chain snapped Renthal heavy duty o ring with was less than a few weeks old.

as if that wasent bad enough the chain wrapped around the front sprocket with bent the alloy case saver witch in turn cracked the case around the clutch arm :bonk:

so im thinking now when i get the bike repaired just to run it without a case saver at all seeing as its what done the damage.

what do you lot think?

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Looks like you're damned if you do and damned if you don't! That said, I think I would try and find an oem case saver and run that next time. They use them for a reason.

Good reason to pull off the chain every once in a while and measure wear/stretch. Regardless of weather you have a saver or not it's irrelevant as long as you chain is in good shape.

chain was less than a month old, if you have a look you can see the split link is still on the end of the chain.

Its the backing link the part that holds the pins that snapped.

untill this happened the chain has never come off or snapped in the past.

what brand chain?

I've never seen a stock yammy chain snap and I've seen some very very abused and stretched ones.

Maybe you were running your chain too tight? But you'd think the weak part of the drive would be the sprocket and not the chain..

I cant see why anyone thinks a case saver would do anything to keep a chain from damaging a case being held on with 2 small 6mm bolts.

If the case saver were bolted to the frame maybe but otherwise a broken chain is going to do a lot of damage

Sounds familiar. My buddy had a bull bar on the front of his Ford so he wouldnt damage his truck if he hit a deer. He hit a deer but the bull bar bent enough to smash his headlight and dent his FR quarter panel. So much for quality protection, eh?

I cant see why anyone thinks a case saver would do anything to keep a chain from damaging a case being held on with 2 small 6mm bolts.

If the case saver were bolted to the frame maybe but otherwise a broken chain is going to do a lot of damage

The original purpose was never to "save the case". It was put there to keep the chain from derailing under high speed decelerations. If you create conditions that cause the chain to break, nothing will "save" the case.

It was Renthal chain. so do you think its worth fitting anther case saver or leave it off all together?

im thinking maybe the case saver saved the chain damaging the flywheel and starter covers.

but maybe without it there would be a bit more space for the chain to go else where should it happen again?

What's your gearing?

The original purpose was never to "save the case". It was put there to keep the chain from derailing under high speed decelerations. If you create conditions that cause the chain to break, nothing will "save" the case.

Would the chain be more likely to derail if someone were to use a 12 tooth sprocket rather than the stock 13 tooth?

yes because it puts an odd angle into the chain alignment.

Would the chain be more likely to derail if someone were to use a 12 tooth sprocket rather than the stock 13 tooth?
Slightly, but it's usually not a problem to run one tooth either way from stock with the stock guide (which is what the factory calls it)
chain was less than a month old, if you have a look you can see the split link is still on the end of the chain.

Its the backing link the part that holds the pins that snapped.

Usually caused by incorrect adjustment (too tight)
... so do you think its worth fitting anther case saver or leave it off all together?
You need the so called "case saver" for the reasons I stated in post #8.

well thanks for the replies so far don't think i had the chain to tight ive had the bike almost 4 years so have a good idea on the adjustment but i guess its not impossible.

running a standard size front 47 rear sprocket's.

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