oil in air filter

[odog]

has anyone ever had oil come back through the air filter. i had about a half a quart of oil go back through the air filter and sit in the air box while i was riding

[Wheelie]

Too much oil in the crankcase?

If the oil level was ok, there is a serious buildup of pressure in the crankcase. What kind of shape are the rings in? Valve guide and valves? Valves too tight?

Just a few things to check for. Might check the head gasket between the cylinder and the timing chain area. A leakdown test would confirm or deny this as a possibility.

[odog]

my engine has just been rebuilt its a 460 now new piston, valves (+1s) gaskets, clutches i mean everything is new