Mornin' All...
In another thread I added a pic of a rather oil clogged air filter which I suspected was from an 1100 that had a little lie down. And I have seen pooled oil within airbox after an 1100 had been dropped and righted soon after.
Whats puzzling is just how a few mls of oil that has made its way into the airbox via the crankcase breather is ingested into the engine to cause it to produce smoke, especially from ingestion via any of the carburetors. Especially given the height of the rubber torque tubes are above the base of the airbox where pooled oil can gather.
I think a more plausable explanation is that oil that has been drawn up the breather tube into the airbox can then reside in the breather tube for a time and obstruct it sufficiently to increase crankcase pressure for it to cause blow-by, primarily past valve stem seals (not piston rings). Thus causing the engine to smoke, temporaily, especially when cold.
Also poor valve tappet clearance (not enough clearance), can cause a valve (especially and exhaust valve), to stick and remain partially open until it heats up sufficiently to close and this too will cause the engine to momentarily smoke.
Just a thought.
Cheers the can:-)
