This is the ratchet spring that fits many OS Engine Needle Valve Assemblies. It is used to hold the needle valve in place after adjustment. FEATURES: Metal Construction Black in color INCLUDES: One Ratchet Spring REQUIRES: None, item is a stock part SPECS: Overall Length: 15.9mm (.625") Spring Length: 10mm (.5") Mounting Diameter: 6mm (.24") COMMENTS: This Ratchet Spring fits the needle valves on the following engines: -LA Series -FX Series -SX Series -61 RX -LX Series -FS52 thru FS120 Surpass Four Stroke Series -FT Multi-Cylinder Four Stroke Series -FF Multi-Cylinder Four Stroke Series -FR Multi-Cylinder Four Stroke Series OS EnginesPart OSM26711305