Got one of these RCG 50 from the Hobby Kings USA warehouse. Engine looked good and I took the engine aprt to check for anything that my have been left after it was assembled. Everything looked good so I put the engine back together and then mounted it to a test stand. Fulled it up with a 30 to 1 gas/fuel mix. Open the needles on the carb to 1 3/4 turns out for both high and low. Mounted a Zinger 22x8 prop on it. Closed the choke and turn on the ignition. Flip the prop 8 times and got a pop. Closed the choke and 3 more flips and she was running. Ran three 10oz tanks of fuel thru the engine at these settings than closed the high end 1/8 turn for the 4th tank. Engine got a pop on just 2 flips. Closed the choke and started on one flip. Ran the engine up to top end first just a few seconds but I got 7400RPM with a Zinger 22x8 prop. I am really glad I bought this engine I will be mounting the RCG 50 to a CMP 80" Zero.