first off change the glow plug and see if it helps.

Then look for the leak. The valve cover could be leaking. A new gasket will help there. Next is engine could be justa little rich on the pump. This could cause a little extra spray from the carb Fuel tank and other issues could be the cause of it quiting toward the end of the flight.

Also check the injector check valve. Is the fitting that fuel line atatches to loose in the plastic of the check valve. If so this will make it go lean and quit. I have seen this happen recently. Especially when people remove the fuel line support bracket from the engine. This allows the fuel line to twist and swing while the ngien is running and puts stress on the plastic injector check valve.

This check valve can be replaced or removed. The engine will run well if proerly setup without the check valve. It will just get a msall surge after a long time at idle like during a spin.

Troy Newman
Team YS