Backfireing

[Rlm20001]

Hi Fish, this is RLM20001 I checked the movement of the valves, the top valve is moving 11.49 mm (.453 in) the bottom valve is moving 11.37 mm or (.447 in) the piston moves approximately 88.61 mm or (3.89 in)
With the plug-in and turning by hand, it seems to have the most compression when both valves were closed.