Clarence, I have a OS BGX-1 mounted inverted in a one-fifth scale Pica P-40. I am using a J-Tec muffler.This engine is very hard to start. I usually have to turn the plane over, place in a cradle, then it starts, by hand, easily. I then shut it down, put the plane back on its wheels and quickly start it (but not always). I have tried various electric starters with no luck. I previously had this engine mounted sideways in another plane and it always started easily by hand and ran fine. When I choke it, lots of fuel just runs out of carb. Suggestions? Would converting it to gas help? Thank you, Bill F.
Like I have said many. many times in the column, anytime you invert an engine you can expect starting and idle problems. The glow plug becomes a sump where the raw fuel collects, putting out the fire. It is very important that the glow plug burn bright orange and not dull red so that it can burn off the fuel. As your engine will start okay side mounted or upright, it rules out any engine problem and is just your starting technique. You are probably just not getting sufficient fuel into the engine due to running out the carburetor. Try leaving the starting battery disconnected and with your finger over the muffler tail pipe spin the engine for three or four seconds. Then connect the battery and hit the engine with the starter, It should fire up right away. Placing your finger over the muffler tail pipe pressurizes the fuel tank forcing fuel to the carburetor and on into the engine. Let me know how it goes.