Os Max-25Fx (3.5Cc-4Cc)21L

Displacement-4.07 cc / 0.248 cu.in.

Bore-18.0 mm / 0.709 in

Stroke-16.0 mm / 0.630 in.

Weight-248 g / 8, 75 oz

Silencer Weight-62.5 g / 2.2 oz.

Output-0.84 ps / 18,000 r.p.m. / 0.828 hp / 18,000 r.p.m

Practical r.p.m. Range-2,000-19,000 r.p.m.

All FX engines come with remote needle valve - the feature most asked for!

A longer crankshaft provides more secure attachment for spinner, prop and nut

Dual ball bearing construction adds durability and longevity

Semi-square head shape creates more fin area to increase cooling capacity

Each engine comes with a high-performance carburetor and muffler with adjustable exhaust direction and built-in pressure tap