how many times can we say this? do you not read anything these people are posting?
THERE ARE NO MAGNETOS AVAILABLE FOR COUNTER ROTATING AN ENGINE THAT IS INTENDED TO ONLY ROTATE ONE WAY AND HAS BEEN MASS PRODUCED AS SUCH.
anything normally fitted with a small engine is designed with the point in mind that all engines of similar design, regardless of manufacturer, all rotate in one direction. be it a generator, a brushcutter, a pump, or a motorised pushy.
you proved you arent a designer by ignoring the basics.
run it on nitro, and give it a glow plug. then it doesnt matter, cus it doesnt have spark ignition.
yes, two strokes will run both ways (as long as they are piston or reed ported). so will standard diesel fourstrokes if you can live with exhaust being driven back through the aircleaner... both these motors can do it just by "bouncing back" against compression. a petrol 4stroke will do it with cam changes. get over it, its well documented in boats and early cars.
kickback is well known in aircraft with no starters. watch the old movies carefully. they smack the prop backwards against compression so it kicks and starts running the right way. works on RC 4strokes, doesnt on RC twostrokes(which can seldom run backwards as they are normally ported through the crankshaft, a variation of drum induction. cox049 etc are the exceptions) so the same can apply when stalled. they kickback against compression and will start running backwards under the right conditions.
a cox 049 can splutter at 25000 rpm and suddenly its running in reverse without you realising til its throttled down!
the majority of manufacturers stick to a standard pattern, and dont deviate.
other than flipping the motor which involves a redesign, and awknowledging you made a fundamental booboo, you could try circuit forensics.
depot your magneto. work out its internals. then reassemble, in reverse.
pretty basic.
all you gotta do is bear in mind if its a N or S pole first, which way the coils are wound so will it produce a negative or positive charge current triggered by a opposite trigger current. and then make sure the magnets line up to cause firing at the correct time still, which they wont because the magnetos are usually assymetrical, so always have the advance built in by design.
i have an old kawasaki brushcutter here that uses a symmetrical magneto. that can be flipped and still wont run both ways as the flywheel needs to be flipped somehow...
you want the last suggestion?
re locate the keyway on the crankshaft/flywheel.
the easiest and most logical option. work out where it is in relation to TDC and add or subtract twice the existing advance to get the new location.
that should work but you may experience polarity issues with the charge currents... some systems will, some wont.
you still havent explained how youll start it in reverse... cus a pullstart wont work anymore.