Wiseco Pistons 4607M09800 High Performance Forged Piston Kit 98mm Bore 3.00mm Oversize 10:1 Compression

The Wiseco 4607M09800 is a high-performance forged piston kit featuring a 98.00mm bore (3.00mm oversize from standard 95.00mm) with a 10:1 compression ratio, designed for 1998-2001 Yamaha YFM600 Grizzly ATVs and various Yamaha XT600, TT600, and SRX600 motorcycles. This kit is built for a 635cc displacement with an 84.00mm stroke and delivers enhanced performance for both trail and racing applications.

Complete Piston Kit Includes:

• 98.00mm ring set (part #3858XH)
• 22mm x 2.002-inch piston pin (part #S550)
• Round wire pin locks/circlips - 22mm pair (part #CW22)
• One forged aluminum piston

Performance Features:

• Forged from high silicon, low expansion aluminum for superior strength, reduced weight, improved heat transfer, and longer life
• Diamond-turned finish from CNC computer-controlled turning centers guarantees perfect finish with no size variation
• Wiseco is unique as the only U.S. piston manufacturer producing pistons strictly using the forging process
• Floating wrist pin style with retainers included
• Flat-top piston design optimized for performance and efficiency

Important Installation Notes:

• Cylinder boring required for proper installation
• Only Wiseco replacement ring sets can be used on Wiseco pistons
• This is an oversize piston designed to extend the life of worn cylinders

Wiseco uses aerospace-grade aluminum and a forging process that compresses the material's molecules, increasing density and aligning grain flow for impact and fatigue resistance. All Wiseco powersports piston kits are produced in the USA, backed by over 80 years of racing heritage and engineering excellence.