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Fused cylinder

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Yesterday I've fused cylinder on my CorsAir M25 Black Devil. Main opinions I've received are about bad oil quality and this is first thing I'll change.

But I were thinking that the first day I start to hear problems was when I tried to add a non return valve in series with my fuel pump. Added because fuel backs to tank after a day. During the first flight after this mod I heard that motor is more loud and had more "bass" pitch. Then I've removed valve and replaced pump with a new one. I've solved fuel return problems, but not the strange sound, on my second takeoff cylinder fused during flight.

Do you think that this valve can be cause? I've read that this carburator is not made to suck fuel form a bottom tank. Can be that this valve got worse and lack of fuel burned cylinder?

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