there shouldn't be any oil in the air box.
since the breather pipe of the crankcase is connected to the air box, this is where the oil is coming from.
maybe there is too much oil in the engine. perform oil change and measure quantity. should not exceed 3 l (min. 2.7 l).
if oil level is o.k. but there is a lot of oil in the air box, maybe piston rings are worn out, which will cause too much pressure in the crankcase.
you can extend the valves at the bottom of the air box with a rubber pipe. let the pipe end somewhere above the inside of the drive chain, by this you get extra greasing of the chain.
regards
klaus
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