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Rmz 250 Excessive Blow By?

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Hey guys I've had this 2004 Rmz for a while I recently rebuilt bottom, top, and valves everything is brand new bike starts and runs perfectly. I'm having trouble with it blowing oil out of the bent tube on a straightaway on my local track, also when the bike is started and then shut off after a few oil slowly leaks out after it is shut off, I always drain all the oil out and put the specified amount in just curious if anyone knows a fix, my rear brake pad budget needs to be cut. Thanks.

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"I'm having trouble with it blowing oil out of the bent tube on a straightaway on my local track, also when the bike is started and then shut off after a few oil slowly leaks out after it is shut off"

Please elaborate... This makes no sense.

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Have you done a leak down test on the rebuilt motor?  Sounds like excessive crankcase pressure.

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 but what's a good fix for too much case pressure?

 

Bad piston rings or cylinder are a cause.

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