My spe 26 has been running great for about 25 flights and several hours breaking in , but now after some minutes working fine it always quits.
The engine starts very easily, can hold idle at 1700 rpm , the transition is good , top is 8000 with 17x6 ( it can even reach 8200 rpm too), but after some minutes running in the field, suddenly it begins to hesitate when throttling up at low rpm, transition turns bad and quits. I tried all kind of needle settings with the same result. Spark looks ok.
My first suspect was dirt in the carb, so I filled up the tank with new gasoline and clean the carburetor the best I know, cleaning the needles ,blowing the needles hole, cleaning the grid filter inside, but no signs of dirt. After that seems the engine is taking longer to quit, even I was able to fly for a while.
But the problem persist, the more trials I do the sooner the problem comeback and is a bit harder to restart.
I need help. Is dirt the problem ?, is the pump membrane ?, how to clean the carb properly ?....