Burning oil

b 4 pulling it down do a cycle of full throttle from low speed to some illegal speed then coast back to slow
10 times
have someone behind to watch for smoke puffs
then wipe the exhaust with a white cloth (also wipe first and clean with soem brakecleen)
pull the plugs and retest the compression
most likely mech problem but sometimes a rebreakin fixes
good luck
any quench? how much?
detonation can kill anything