First Generation Ascots > Tech Section

Oil in air box?

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ratinthejat800xl:
I think maybe one of the exhaust valves is stuck open.

twerth:
Was it a cleanable filter like a K&N or Uni? Maybe the element was over-oiled and it ran down to the bottom of the air box over time. That would explain why it was clean while the crankcase oil was black.

WTF304:
Zero compression, oil in the air box ... I'd bet more on the intake valves. Jumped time, piston meets intake valves, jabs whole in the piston. While you've drained the oil, I'd check the timing and make sure they are set correctly ... might aswell check the balance shaft chain tension to. If the timing is off, I'd pull the carb and look down the throat of the carb and intake port of the head. I've seen where one of the screws on the butterfly valve in the carb came out and ruined a perfectly good engine. Basic checks will get you pointed in the right direction though ... fuel, spark, compression, timing. Compression loss can be a few things but it will 8/10 times be internal ... bad head gasket or wrong timing  is the other 2/10 I feel. Let us know what you find

smcohio:
Could also happen if the bike has ever been dropped. I have a similar story when I first tore down my bike. My wife was standing across from me while I was pulling out the air box and as I ripped the hoses out there was a small amount of oil in the breather collection box which flung clear up the front of her. Not a way to impress the wife lol.

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