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bike cut out

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my buddy was riding his 2008 rmz250 down a straightaway on his track and the motor completly cut out, and will not start. its not seized or locked up. it just acts like it has no compression. could it possibly be the auto decompression spring on the exhaust cam stopped working?

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Start with the basics,

1: Check for fuel, make sure it is getting to the cylinder.

2: Check for spark a cheap tester works well available at auto parts stores

3: Check compression also available at auto parts stores.

4: those 3 things should lead you to the problem

Sounds most like streched valves to me.

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what are stretched valves? I have never heard of that before.what are the consequences of this? By the way good advice, always start with those 3 although fuel can be a little more complicated compression and spark are pretty straight forward.

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