05 TRX 450 kicker Purchased non- running. Replaced crank, and top end. Started it up and runs fine but was burning coolant, replaced head gasket and installed new head studs. Started it up and ran fine for about 5 minutes, then started burning coolant again. Hooked air compressor to spark plug and the only hissing I hear is out the exhaust. I do not see any cranks in cylinder or head, I am stumped.