Namura Standard Bore Top End Repair Kit Size B for Yamaha YZ450FX 2021-2023 97mm
Namura Standard Bore Top End Repair Kit Size B for Yamaha YZ450FX 2021-2023 97mm
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Standard Bore Top End Repair Kit Size B for Yamaha YZ450FX 2021-2023
The Standard Bore Top End Repair Kit Size B provides a complete set of piston, rings, and gaskets to restore compression and performance in 2021-2023 Yamaha YZ450FX engines, featuring a 97mm bore.
Overview
This top end repair kit is engineered for Yamaha YZ450FX models from 2021 to 2023, providing a precise 97mm bore and Size B piston for a reliable overhaul. The kit includes a piston, rings, wrist pin, circlips, and all necessary gaskets to complete the job. Whether rebuilding after hours of cross-country racing or performing preventative maintenance, this top end repair kit ensures the engine runs like new.
Built For Performance
- 97mm bore piston designed for standard cylinder dimensions
- Size B piston provides proper clearance for stock Yamaha YZ450FX cylinders
- Complete gasket set included for a hassle-free installation
- Heat-treated wrist pin and circlips ensure secure assembly
- Matching rings pre-gapped for quick installation
- All components are precision-machined to Namura's quality standards
Fits These Machines
- for Yamaha YZ450FX 2021
- for Yamaha YZ450FX 2022
- for Yamaha YZ450FX 2023
On-The-Job Use
- Cross-country and GNCC racing requiring reliable top end performance
- Enduro and trail riding where engine longevity is critical
- Complete engine rebuild during off-season maintenance
- High-performance riding on tight, technical terrain
Specs At A Glance
| Bore Diameter | 97mm |
| Piston Grade | Size B |
| Kit Contents | Piston, Rings, Wrist Pin, Circlips, Gaskets |
| Engine Type | Yamaha YZ450FX (2021-2023) |
Good To Know
Q: Does this kit include a new cylinder or only piston and gaskets? A: This kit includes piston, rings, wrist pin, circlips, and a full gasket set; it does not include a new cylinder.
Q: Is the piston pre-installed on the rod? A: No, the piston comes separately and must be assembled with the wrist pin and circlips during installation.
Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.
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