loss of compression, loud pop

So I recently replace some oil seals and the impeller on my water pump. When I put the crank case back on I tried to start it, and it really dosen't want to start. I will kick it 10 or 15 times with nothing, then on the next kick I lose all compression and the loudest pop comes out of the exhaust. Anyway any help or advise would be very appreciated.

If the bike sat around for a couple of months waiting on repairs, the pilot jet could be clogged.  Also check the spark plug (try a new one).  If you still have trouble check the cam timing.

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