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Honda Xr 1999, Smoking after Rebuild

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Hey Guys. I have a Honda XR 250r 1999 that i have just rebuilt. I got the piston and barrel done in a shop along with the valves. The bike is running well but has a issue with burning oil. The decompression valve on the engine was jammed but we managed to free it up but the bike has lacked compression since it was freed. I have no issue starting the bike but would a broken/stuck decompression valve be a reason behind the burning of the oil and lack of compression? I started with a synthetic oil but was advised to use a mineral so did a oil change and now have 20w-50 mineral in the bike but have seen no change.

Edited by Churchy

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I don't believe the compression release would cause the oil  burning.   The manual and I would be removing the valve cover and lookiing around for a bad oil seal install.  What did they do with the valves and guides?

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