Are you flying flights back to back to back. Or do you let the engine cool in between flights? This is important in HOT temps.

60deg F is what I'm assuming 60deg C would be really hot. At these lower temps I would bet you are a little rich on the top end. If the transition and idle are excellent then I would try leaning the top end just a little and see if that is the solution.

Another option could be a partially clogged fuel filter. Or some dirt or debris could be in the regulator. When the engine sits the dirt gets stuck to the side of a passage and then after its run a bit the dirt or debris gets loose and partially blocks a passage.

I would try to lean it out a little and see if it goes away. Be careful you don't want it to start detonation or backfiring. It is more likely a borderline too rich condition, but its tough to diagnose any problems like this over the Internet. If I heard the engine I could tell you but alas I'm not in Cyprus.

Another thing is you have a few flights on it. Is it the original Glow plug? I end up changing plugs about 6-8gallons usually. This may be an issue but if it runs fine for a couple flights then acts up, then the next day out its fine again probably not the plug but it could be.


Troy Newman
Team YS Performance