Wiseco K12191 Forged Piston Kit for Yamaha FJ1100/FJ1200

The Wiseco K12191 is a complete forged piston kit designed for the Yamaha FJ1100 and FJ1200. Wiseco's forged pistons are trusted by both competitive racers and recreational riders for their superior strength, precise fitment, and long service life. Each kit includes pistons, rings, circlips, and wrist pins.

Key Features:

• Forged High-Silicon Aluminum Construction: Forged from low-expansion, high-silicon aluminum alloy for superior strength, reduced reciprocating weight, improved heat transfer, and extended service life compared to cast alternatives.
• Diamond-Turned CNC Finish: Precision CNC turning centers deliver a consistent, exact finish with zero size variation, ensuring reliable fitment in any cylinder bore composition including cast iron, chrome, Nikasil, and boron composite.
• Oversize Availability: Available in a range of oversizes to restore worn cast iron lined cylinders; replacement cylinder sleeves also allow chrome, Nikasil, and boron composite cylinders to be re-sleeved for oversize piston use.
• Complete Kit: Each kit includes forged pistons, compression and oil rings, circlips, and wrist pins for a straightforward installation.

Wiseco has been manufacturing forged pistons in the USA since 1941, and their computerized production facility is dedicated to producing the highest quality forged pistons available for both performance and recreational applications. The K12191 kit provides a direct-fit solution for rebuilding or upgrading the Yamaha FJ1100/FJ1200 engine with confidence.