If you want to fly the engine 3D, take care of a good, and well guided cooling air flow. The 26cc engine has small cooling fins, so it is very important to keep the engine at a comfortable operating temperature. Do not take shortcuts here. The engine has a graphite coated piston, and will not show it's heat discomfort by sagging untill too late.
See http://www.prme.nl/forum/viewtopic.php?t=37

Also it is very important to use the right oil. A fully synthetic two stroke racing oil is required in a 1:33 to 1:40 mix with premium gas of 91 pump (91 MON) octane or better. Lower octane values will cause detonation that wrecks the big end bearing.