YZF450 06 problems, sudden stop

hi

My friend was riding hi 450 06 today and is stopped.

The engine has had a full re-build with about 8 hours on it. All new parts.

He said it seemed like he missed a gear and then all of a sudden stopped. now won't turn over.

Any ideas please

Could it be gearbox?

Thanks:banghead:

found the problem.

Broken valve

Ouch!

that blows especially on a new rebuild

Just curious, what valve failed? and did he replace the valve guides?

sorry don't know what one failed. we think this was caused by heat as all the water had gone from the rad's

IMG_1740.jpg

this is the reason it stopped,

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