I needed to convert a Cub that was just not"right" with e-power, and since the Cub was a gift from the better half, I wanted to make it "better". Did some searching, read some posts, decided I just had to go "cheap" and sprung for the RCG 20cc from HK. Opening the box was a very pleasant surprise....well-packed, shipped from US warehouse, took all of 3 days, and it was very nicely-done. Nice quality casting, double-ring piston, has the Chinese imitation-Walbro, and the imitation RcExcel CDI (this one is Paragon marked). Even came with nylon mounts that had been machined to permit a nice slim install. Couldn't believe it.

Anyway - make a long story short - got it all installed, and before first run, I pulled both the pump side and the regulator side off the carb, filled with gas, dribbled some inside, turned it over by hand a few times just to get it wet.

Choke on. Throttle at high-idle. Ignition on - FIRSTFLIPBurp. Couldn't believe it. Must have been that pre-treating.
Choke off. FIRSTFLIP running, and running very nicely. Really couldn't believe THAT.
About half way through the first tank - flip kill switch. It worked. Turned back ON - FIRSTFLIP started again - <HOT>....so I did that a few more times just to be sure it wasn't a fluke.

Normal pump gas, with Pennzoil Air-Cooled at 30:1, stock muffler, Valley View 16x8 for early running.
Am quite sure it will haul that Cub around with way-over-scale-power....

Will report back when I actually get a flight in, and update with some install pics....so far, best $179 including delivery that I've ever spent on an engine.

I have many tanks of fuel through mine Bob. It seems to have all the over achiever traits the DLE 20 has, spining the same size prop at the same rpm (17x6 mid 8k's). Hope you have the same luck with yours that I've had!

If you need parts (mine has been perfect going into it's 3rd season now), RCGF is the same engine with much better warranty and support.