Has anyone ever broken a cam chain...ever?

I'm not asking your expert opinion on when to change the chain or tensioner or even the guide, has anyone ever heard of a crf450R or X cam chain break? I don't care about jumping teeth when the tensioner craps out,a cut ally break and destroy your engine? Just curious

Never...not one time.

Nope i never have

Here at APE/Bigborethumpers.com have had a few of our customers brake cam chains, but very un common. One broke after installing a new head, and the results were tragic. 

just after a head change makes me think something else might have caused it to break rather than worn out.

I have seen them break, but not because of chain failure, but the chain coming off the gear set and getting wedged/snapped.

I have seen them break, but not because of chain failure, but the chain coming off the gear set and getting wedged/snapped.

 

 So the chain tensioner malfunctioned causing the chain to come off the sprockets?

A very kinked cam chain came out of the engine that is all blowed up on my bench.

Now that I think about it, it was not an X, it was an XR.

Now that I think about it, it was not an X, it was an XR.

Yea totally the same bike man. Nah lol shit happens!

Over tightening a Mechanical Tensioner could cause a failure .

I have never heard of one snapping .

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