06 rm250 sudden loss of power

I was riding supercross and on the face of a jump the motor started losing power. It ran but not good at all. Haven't broken it down all the way due to time but got close. Its just a motor and frame. There was gunk in the mouth of the carb so I know dirt has been sucked in. Also my boot ripped the tag off my pc pipe and a hole was in the exhaust wout me knowing. Pencil sized approx.

Its got a hotrod crank :-\ and vertex piston with a solid race season on it. Prob 45 hrs.I know I know.... so what am I looking at? When I spin the countershaft it clicks a little btw... ive still got my oem crank so ill be sendind it out for a rebuild and re use it this time

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