Cam Timing

High everyone ,I have got a 03 yz450 that has jumped one tooth on the cam timing which results in a mechanical lock up , this has happened twice both times after a slow get off.After the first time a motorcycle mechanic had a look and could not find anything wrong and just renewed the timing chain . So if any body has any ideas or any similar problems please let me know .

I would check the chain tensioner this time, and not let that mechanic touch your bike again!

I second the cam chain tensioner check...

I will check it and see thanks for your ideas

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