I tried the whole system today - with HUGE success! YAY!





Here is the tuned pipe data:

Fuel: 95 Octane gasoline with 10% mineral oil. (castrol Scooter 2T)
RCexl Ignition: 1 cell 1500mAh LiPo
Propeller: JXF Wood 18x8W
Tuned Pipe: MVVS 26CC original
Header: Just Engines Custom Manifold
Carb: Walbro Evo 26CC original (9.53mm throat)

With original length header:
7500 RPM MAX
1900 RPM IDLE

With 1 inch chopped off of header:
7800 RPM MAX
1850 RPM IDLE

With 1 cm more chopped off:
7920 RPM MAX
1800 RPM IDLE

With 1 cm more chopped off:
8040 RPM MAX
1750 RPM IDLE

Incredible transition. No overheating and very quiet.
Actually I could gain a little more from the engine by cutting the header even more, but this was satisfactory enough for today.

This concludes that OS 160FX is a primary candidate for a gasoline conversion.