Quote:
Originally Posted by
Molgan
I'm sure, and it's not a bit of overflow. When it happens There's a litre or more that pours out of the airbox drain pipe. And it happens in an instant. Went to see a friend just a hundred kilometers away, when I left home oil level was fine and when I arrived I had 1,5 litres of oil in the airbox.
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If it was an Enfield Bullet (or any other old British bike for that matter) then I would say it was a classic case of a dry sump engine "wet-sumping". Basically the oil pump isn't scavenging enough oil for whatever reason, the oil level in the tank falls, the oil level in the crankcase builds up too high and the excess gets blown out the breather (or if the oil control ring is weak and can't wipe the excess, it goes out the exhaust.)
Never heard of it on an XT though? Usual cause on Brit bikes is worn scavenge pump rotors (or plungers), blocked oil screen or a randomly sticky or permanently stuck open check valve on the oil feed line. You often found it an issue on bikes that had been stood for a while.
For 1.5 litres of oil to go AWOL and into the crankcase and out the breather I'd say it could well be something similar?