I have a H9 Spitire with a 33cc Evolution engine. I have had two flights with two dead stick landings. Both times the engine quit when I tried to throttle back to 1/2. Both times i managed to land the aircraft without damage.
The engine was initially run on the ground using a 17 x 8 APC prop for approxately 1 hour using a 20 to 1 Redline gas oil mixture at a low throttle setting within issues in starting or getting a good transition from idle to full power. The engine would run through a full tank of fuel without any issues through all throttle settings. Other than a vibration issue the engine seemed to perform very well and I was impressed with it. The vibration issue was solved by changing the spinner nut (the original supplied nut was off centre) and balancing the spinner. All runs and flying was done without the cowling.
To fly the fuel mix was changed to a 30 to 1 mix and the engine retuned before flight and everything seemed to be good.
My question is has anyone had a similar issue with this engine and what was done to solve it? I seem to remember that there was a thread that talked about an air flow issue with front mounted carbs that would cause these engines to be unreliable. I have done searches and have not been able to find anything.