4894M07900 Wiseco Std Piston Kit for Yamaha Nytro 2006 79.00mm 9.5:1 CR

Wiseco Std Piston Kit for Yamaha Nytro

This Wiseco standard piston kit is a forged replacement piston for the Yamaha Nytro 1049cc engine, cross-referencing part number 4894M07900 with a 79.00mm bore and 9.5:1 compression ratio.

Overview

This Wiseco piston kit for Yamaha Nytro provides a stock-bore forged replacement for the 1049cc triple. The 79.00mm piston keeps the factory bore size while running a 9.5:1 compression ratio, so no overbore machining is needed. It fits riders and builders doing a straight top-end refresh on a worn or damaged Nytro engine.

Built For Performance

• Forged aluminum construction for strength and heat resistance
• 79.00mm bore size matches the stock Yamaha Nytro cylinder
• 9.5:1 compression ratio for factory-style combustion pressure
• Cross-references Wiseco part 4894M07900 for identification
• Standard-bore design, no overbore machining required
• Built for the 1049cc Yamaha Nytro engine platform

Fits These Machines

• for Yamaha Nytro 2006 with 1049cc engine

On-The-Job Use

• Stock-bore top-end rebuilds on Yamaha Nytro snowmobiles
• Replacing a worn or damaged piston without boring the cylinder
• Refresh builds that keep the factory 79.00mm bore size
• Trail and mountain riding where stock compression is preferred

Specs At A Glance

Good To Know

Q: Does this piston require cylinder machining? A: No, the 79.00mm size is standard bore, so it is made to fit the stock Yamaha Nytro cylinder. The bore should still be measured and honed before assembly.

Q: What compression ratio does this piston kit run? A: It is rated at 9.5:1, matching the stock figure for the Yamaha Nytro 1049cc engine. Verify your head and gasket setup during the rebuild.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.