I totaly agree with azsand!! This happend to me when my ds was stock and after my up grades. [img]i/expressions/face-icon-small-smile.gif[/img]

 

I have always had a little oil come out my breather each ride - I have a pleated filter on my breather hose, and I rubber band a small piece of shop rag around it and change each ride to keep from having a mess.
One thing I did notice when my waterpump seals failed and I got coolant in my crankcase was that the frothing from the water in the oil made the breather tube blead like a stuck pig - mega mess all over the place!!!

What is normal DS compression? I've been trying to find out - dealers can't tell me, shop manual doesn't say either. On the older bikes you could disable the decompressor cable for an accurate reading - looks like on the DS you'd have to pull the valve cover to disable the compression release. how do you check it AZ?

 

Since the DS has two spark plugs, you can just put the compression tester in one and start the motor and run it. You can even run it out on the trails and make sure you keep good compression all day. Just jokes

Im guessing the guys with aftermarket cams dont have decompression levers. Or maybe they just do leakdown tests with the cam in a position that the decompression lever isn't active. Dunno.

 

With OEM motor, compression test should be over 200psi (turning motor over several times until needle peaks, AND HOLDING THROTTLE WIDE OPEN) with decompressor temporarily disabled. IF done carefully, the decompressor can be bypassed using a tiny piece of THIN cardboard rolled up in a cylinder and gently inserted into decompressor to hold it open. Cardboard from a spark plug box works good. Don't forget to remove the cardboard when done!!!

A compression test doesn't always tell you there is a problem!

A leakdown test is more valuable. You should get 2% or less. 5% or higher indicates a problem. You need a 100psi air source for the test. You should insert the crankshaft locking bolt at TDC before pressurizing.

 

Thanks!!