I am finishing up the Extra 300s 60 size build and the motor is a magnum .91 4 stroke. There is a cutout in the bottom of the fuse just below the firewall that is for the exhaust to exit. I have the motor mounted at 90 degrees and have routed the muffler ( with the aid of a rubber extension) so it exits in that location. My concern is that the muffler is almost directly below the carb on the motor and I know (having run my motor on a test stand) that the carb will tend to drip fuel while trying to start it and after it is shut down. Is this dangerous to have the muffler directly below the carb on the motor????


Thanks for all the help!!!
Some great info here on this forum!</p>

I wouldn't worry about it

Interesting. I am also finishing up a Great Planes 300s. I to have rotated the engine (91 4S) with a rubber muffler extention 90 degress. I also have this setup with other planes. I don't get any carb leaks. It could be that I use a clamp on the intake fuel line until just before I'm ready to start it. Once I remoce the clamp and start it - no problems.

At the most you will have a very brown muffler as the fuel will drip from the carb on to it and burn on with a castor stain. Just keep your muffler clean with some soap water and if it bakes on, use a fine polish paper to clean it once in a while

Ameyam

Thanks fellas.... awesome info as always!!