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And the second one now works! Indeed the crankshaft must have been distorted which I believe caused piston arm wobble which caused the piston to rub on the cylinder which caused excessive friction/heat and oil burning. (Which I share here in case someone else observes similar issues.) Also I...

Hello! So I got my second YH working and this allowed me to do an A/B experiment. I was able to definitively confirm that the copper wire significantly reduces moisture on the HP side. Without the mod, most of the moisture comes out at the HP side. However with the mod, almost all comes out at...

Yeah, Gx CS4 is probably the best standalone pump out there atm.

Update: Have one working beautifully: https://www.airgunnation.com/threads/some-yong-heng-water-cooling.1257844/post-1643173 Second had high heat and oil burning even after new piston and deburring crank shaft. I suspect the issue is crankshaft alignment so I replaced it (for just...

Makes sense. I can confirm: I _did_ get some moisture on HP side but post mod, now only from condenser. With this mod, and my low humidity, I doubt I even need another condenser.

Thanks! I noticed marginally more moisture extraction from the first condenser. (I also use another; "toauto" brand purchased from Amazon. From this I have almost no moisture.) However it was a day with low humidity. I would imagine that in a humid area, this mod would make a considerable...

I also did this mod, except limited to after first and second stages only. The result works well--everything is cool-to-touch except first stage piston cylinder case. The peak running temp (after >30 min) is <48c. I chose this mod because I figured that if I already had water cooling setup...

Sounds great! Thank you! I'll swing by tomorrow before noon, if that works for you?

Hi! Are the parts still available? I live in Mountain View and would happily drive up to the city.