More cooling fin area to extend the life of the engine
Added webbing on the crankcase to strengthen high-stress areas
Coarser threads on the remote needle valve for easier engine tuning
Overall tighter needle valve fit with O" ring
A fuel inlet that points up for easier fuel line access
A set screw on the needle valve for an optional extension
Flat drive washer to expose more crankshaft threads for securing prop
Nylon backplate eliminates metal to metal contact when using electric starte
The OS LA Series is a whole new design in sport engines and features a remote needle valve for making carb adjustments safer, and a nylon backplate that is less susceptible to damage. Also new is the color — metallic blue (the .40 LA engine is also available in the original natural aluminum color).