Description
When your YFM250 Big Bear’s original piston is worn or damaged, a quality replacement directly impacts throttle response, compression consistency, and engine longevity. The Wiseco 4675M07100 delivers the durability and precision engineering you need for reliable performance, whether you’re tackling technical trails or pushing harder on the track. This complete kit arrives ready to install with everything included—no hunting for separate components.
Technical Specifications:
- High-silicon alloy construction
- Yamaha YFM250 Big Bear compatible
- Years: 2007–2009
- Includes piston rings
- Includes circlips
- Lightweight design
- Optimized compression geometry
- Trail and racing rated
- Complete installation kit
- MPN: 4675M07100









