Standard Piston Assembly for Briggs Animal Kart EnginesAt the heart of your kart's power lies the 555660 standard piston assembly, engineered for Briggs Animal engines to provide unwavering performance. This piston, with its precise tolerances, seals the combustion chamber tightly, maximizing pressure buildup for that critical burst of speed off the line. In LO206 racing, where every ounce of efficiency counts, it shines by minimizing blow by and heat loss. Why choose standard sizing? It fits factory spec