Hi again,
Now that I have had the engine together and did my break in I am getting aquainted with how the decompression device works and performs.
So far, it does exactly as advertised. The stroke feels like a 125 or 250.
Once the first ignition occurs the valve closes and the engine performs flawlessly.
The vent does put a bit of residue on the elbow, but, that cleans right off at the end of the ride, during bike washing.
I would recommend this upgrade to anyone!!
Hawkeye