Learnt something very important from my 3W 200 after running this 14 hours with a Mejzlik 32x10 at 5650----Being a Twin Spark engine the Low Idle rpm of 900--Superbly smooth transition--Flat mid-range--very reliable throttle response---are characteristics no Single Spark engine comes even close to.For aerobatics/IMAC making say 1500 feet vertical downlines at idle and then increasing throtle at a point when the engine goes naturally rich/drowning--- these characteristics are worth their weight in gold.
Have ordered two 3W 170 Twin Sparks----Will not fly Single Sparks.Incidentally have flown Single sparks over 350 flights.