Hi,

... since Troy is gone for the moment, and asking us to answer this topic, i have an suggestion to your problem ...

I guess you have already checked the valve clearance .. if not .002 " is a good starting point ...

What we have seen is carbon build-up around the exhaust-valve stem, causing the valve to stick in the guide,preventing the valve to return in the valve seat ( Often felt as low-or no compression )... carbon build-up in the valve-seat can more likely be the cause if the compression is good and you suspect some small leakage...

What you can do is disassemble the valve, put the vale-stem into a dremel-machine, and use a soft material ( like aluminium ) to remove the carbon ...

The DZ head is really good regardarding the valve seat, and basically the problem are often related to the carbon build-up to the exhaust valve ...

Hope this help

Kjell Olav.