SKU:11-2261
Upgrade your Harley FXR with the Keith Black 390 hypereutectic piston kit, a.030 oversize set designed for a 3.498-inch bore.
Crafted from a cast hypereutectic alloy, these pistons are built to deliver increased power, improved fuel efficiency, and longer-lasting performance. The kit uses a 9.5:1 compression ratio optimized for enhanced throttle response and efficient combustion, while the low heat transfer properties help keep piston skirts cooler during operation. High ring placement reduces detonation and elevates top-ring temperature to support more efficient combustion.
Specifications and compatibility:
Notes: Proper break-in is essential—run the engine at moderate speeds for at least 500 miles to seat the rings and pistons for longevity. For installation, refer to the online instructions and consider using Ring-O-Matic Ring Compressor Kit and Wrist Pin Ring Tool to facilitate a smooth install. This piston kit provides a durable upgrade to improve performance and efficiency.
Keith Black piston set is.030 oversize and is for a 3.498 inch bore. Piston set has compression ratio of 9.6:1 and includes rings.Upgrade your Harley Davidson FXR with the Keith Black 390 hypereutectic alloy piston kit, part number KB305.030. Crafted from a cast hypereutectic alloy, these pistons are designed to deliver increased power, improved fuel efficiency, and longer-lasting performance. The pistons are.030 oversize, suitable for a 3.498-inch bore, and feature a 9.5:1 compression ratio to optimize engine performance. The low heat transfer properties of the alloy help keep the piston skirts cooler, minimizing expansion and enhancing durability during operation. This design also supports high compression ring placement, which not only boosts power and economy but also reduces detonation and raises the top ring temperature for efficient combustion. The pistons are cast in Mexico and are intended for use in specific Harley Davidson FXR models from 1984 to 1993, ensuring a precise fit for these engines. Proper break-in is essential; run the engine at moderate speeds for at least 500 miles, avoiding excessive lower gear operation to allow the piston rings and pistons to seat correctly and maximize longevity. For installation, consult the detailed instructions available online, and consider using recommended accessory tools like the Ring-O-Matic Ring Compressor Kit and Wrist Pin Ring Tool for a smooth installation process. This kit provides a reliable upgrade to improve your motorcycle's performance and efficiency with a durable, high-quality piston set.
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