4-stroke sound and O.S. power for 1:8 scale!

Nothing beats a 4-stroke for producing lower, quieter, more realistic exhaust sound...and no one beats O.S. when it comes to developing a high-performance, nitro power plant. The new FS-40S-C engine delivers tremendous torque for long climbs and twisty tracks, as well as a bottom-end burst of speed for quick take-offs. Plus, it offers better fuel economy than 2-strokes.

• Features a rear-mounted Type 40P rotary carb with screwdriver-adjustable throttle stop screw and main needle
• The in-line fuel inlet rotates 360° for optimum installation ease
• A black alumite coating on the crankcase and rocker cover and heat-dissipating fin that extends from the head to the crankcase increase cooling capacity and life expectancy
• The camshaft features advanced timing, a helical gear drive and ball bearing supports for smooth, high-performance operation
• Other features include a ball bearing-supported crankshaft, ringed piston design, a drilled/tapped rear cover, and the option of a heavy-duty recoil starter for added convenience
• Available with or without a heavy-duty recoil starter
• Includes: Type F glow plug, #201 air cleaner
  Requires: muffler, manifold, glow fuel w/10-20% nitro content & 18% oil content (not common 4-stroke fuel)
  

Reinforced valve springs on the FS-40S-C increase their stiffness, and reduce high rpm "floating".