Wiseco K1658 V-Twin Piston Kit HD Evo 883 Overbore to 1200 9.5:1 CR

The Wiseco K1658 is a forged piston kit designed to overbore Harley-Davidson Evolution 883cc engines to 1200cc displacement, delivering a 9.5:1 compression ratio. Compatible with 1986–2010 applications, this kit is a proven solution for riders looking to extract more performance from their Sportster powerplant without sacrificing reliability.

Wiseco pistons are forged from high-silicon, low-expansion aluminum alloy, a material chosen for its superior strength-to-weight ratio, excellent heat transfer characteristics, and extended service life compared to cast pistons. The forging process aligns the grain structure of the aluminum, resulting in a denser, more fatigue-resistant piston that can handle the stresses of performance riding.

Key Features:

• Overbore conversion: Transforms an 883cc Evo engine to 1200cc for increased displacement and power
• 9.5:1 compression ratio for improved throttle response and performance on pump fuel
• High-silicon, low-expansion forged aluminum construction for strength, durability, and reduced weight
• Diamond-turned CNC finish ensures precise sizing with no variation from piston to piston
• Compatible with cast iron, chrome, Nikasil, and boron composite cylinder bore compositions
• Available in oversizes to extend the life of cast iron lined cylinders or resleeved cylinders
• Manufactured to meet the demands of both performance racers and recreational riders

Wiseco's state-of-the-art CNC manufacturing facility ensures every piston meets exacting tolerances, giving you confidence in a direct drop-in fit. The K1658 is an ideal choice for any Evo Sportster owner looking to upgrade displacement and performance with a quality forged piston kit.