Originally Posted by
hsukaria
I think the tilt-up mufflers were meant for side or inverted mounting. Tilt-up mufflers might not be good if the engine is mounted upright because it causes accumulation of exhaust fluids in it.
I recommend the next time you purchase fuel to get it with 20% castor. It is actually cheaper than the synthetic and that is what your engine was designed for.
I'm not sure about changing out the carb, all the Fox carbs I ever dealt with were excellent. Even the old butterfly versions. Admittedly, I only dealt with sizes .40 and up.
The tilt up & tilt down were meant to accommodate the airplane the engine was mounted in. Oil will accumulate in either one. My racing fuel for the Quickee was 15% nitro, 18% castor. All my Foxes loved that fuel.
CR