Athena CRF290 85mm Big Bore Performance Piston Kit

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Athena CRF290 85mm Big Bore Performance Piston Kit. Engineered for applications ranging from motocross to enduro racers, this complete piston kit replaces the overbore piston for A thena 290cc Big Bore Kits on CRF250R,, CRF250RX, Models Designed and produced with high precsion forging, CNC precision manufacturing, box bridged skirts, DLC coated wrist pin and Moly Coated Skirts: Premium Forged Construction: Crafted from a high-performance, high-silicon aluminum alloy using reverse extrusion for superior strength and OE-level reliability. Precision Machined: Produced with state-of-the-art CNC machining, ensuring dimensional tolerances of less than 0.01 mm for a perfect fit and optimal engine function. Reduced Friction & Enhanced Durability: Select pistons feature a molybdenum disulfide coating on the skirts, minimizing friction and extending the lifespan of your engine components. Optimized Power Delivery: Designed for regular flow and perfect flame propagation, translating to consistent, powerful acceleration and improved throttle response. Race-Proven & Tested: Engineered in Italy by Athena R&D, rigorously tested on dynamometers and on track under extreme stress for validated performance. This complete Piston Kit ensures peak performance for your next race or ride. Trust in Athena's 40+ years of expertise, combined with HP Race Development's commitment to bringing you only the best. Each kit meets or exceeds OE production standards, guaranteeing exceptional quality and reliability for serious riders seeking that professional edge. Athena PN: S5F08500001A, S5F08500001B, S5F08500001C Show more