FEATURES: Improvements over the original FS series include;                    
            Elimination of Crankcase venting-excess crankcase oil is now drawn 
             into the Rocker Cover, injected back into the combustion chamber. 
            Stronger Connecting Rod, Wristpin and Valve assembly               
            Extended intake tube on Carburetor restrains the reverse flow of   
             the air/fuel mixture                                              
            Decreased width Camshaft housing for less interference with sides  
             of aircraft nose section                                          
           F-4040 muffler with adjustable offset and outlet direction for      
             easier cowl installations                                         
           40NA two needle Carburetor                                          
                                                                               
INCLUDES:  O.S. Max FS56-a Four-Stroke Engine with F-4040 muffler, type "F"    
            header pipe, glow plug, instruction manual