Hi Dave,

I'm back! I received my engine back from YS and flew it without touching any adjustments. The engine still surged significantly at any throttle setting below 1/2 and died on my 1st approach for landing. Since receiving the engine back from you, I have abour 2 1/2 gallons of fuel through it. I've tried Cool Power 30/20 (Nitro/Oil), Cool Power 15/20 and Magnum 30/20. Regardless of the fuel, regardless of the additional time on the engine and regardless of the settings I have tried, the engine runs no better than it did out of the box. As stated above, it surges below 1/2 throttle and won't idle for more than about 20 seconds before it dies. I've also run it on my test bench with a completely different fuel tank, hoses and check valve. No change.

Any suggestions before I send it in for the second time?

Thanks,
Timothy Farrow