56FS-a 4-Stroke Engine

A big performance boost for 40-size planes!

Ushering in a new era in O.S. 4-stroke technology: the 56FS-a. It's the first in the alpha series, with the latest advancements for boosting your plane's performance.

• Mounts with no-mod ease in the same space as the 52FS.
  
  
• In addition to less noise, the muffler features a multi-positional manifold with a rubber O-ring that helps prevent oil leakage.
  
  
• A newly designed lubrication system eliminates the need for crankcase ventilation.
  
  
• The 40NA carburetor is equipped with a venturi that reduces the chance of fuel leaking out onto the cowl, while also creating more positive air/fuel flow.

It's like giving your 40-size plane a new lease on life!