to much oil

I just got a yz450f 05 and rode it for about 5 mins and it stopped and wouldn't start we took it home and drained the oil to find there was 4 litres in it and furthur inpection i found that the cam had jumped about a quarter of a turn and one of the valve caps had disintergrated there was also before all this happened very little compression with the kick start would most of this been due to the excess oil?

...would most of this been due to the excess oil?

No, it would not.

do you have any idea why this would happen engine had only done 14 hours since rebuild?

There are a number of possible reasons. Only a tear down will tell you anything.

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