The reason I started this thread is to learn about 4-stokes - which I think I have done.

I've had problems with 2-strokes idleing smoothly & accelerating smoothly and quickly in flight.

DO 4-strokes run better inverted and in rapid climbs?

Now another stupid newby question - is 4-sroke the same as 4-cycle and 2-stroke the same as 2-cycle.