I have worked through all those variables. Remember, I said I had engine problems? I did check just about everything to get them resolved.

I dont think I should put a 14x4 on this engine. Witha 13x4 I noticed that after running for sometime, the compression gets very soft as the engine overheats (compression comes back when engine cools for a few seconds). A 14x4 is likely to make it worse

The fuel I am using is klotz100 based with 10% nitro and 20% lube in the mix. Its only a couple of weeks old and the main can has been mostly sealed. I carry around a litre of fuel, thats all I need for one day's flying

Ameyam