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getting any ticking/tapping - perhaps scoring or oval cyls allowing some oil past (flat engine, so opportunity for oil to seep past rings while sitting if seal bad)? ie, confirmed that it is aos? i think smoke bombs are a result of scavenge pump in the head getting overwhelmed in a high-g sweeper and liquid oil (instead of vapour) getting sent out the vent in the head right when you step on the throttle out of a sweeper and open up the diaphragm again.
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