40254M09700 Wiseco Std Piston for Yamaha YZ450F FX 2020-2023 97mm 13:1
40254M09700 Wiseco Std Piston for Yamaha YZ450F FX 2020-2023 97mm 13:1
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Std Piston for Yamaha YZ450F/FX
This Wiseco standard piston is a 97 mm, 13:1 high-compression replacement piston for the Yamaha YZ450F and YZ450FX, cross-referenced to OEM part 40254M09700.
Overview
This standard piston for Yamaha YZ450F/FX models is a forged replacement component built to restore top-end compression on 2020 through 2023 machines. The standard piston for Yamaha YZ450F/FX runs at a 13:1 compression ratio across a 97 mm bore, making it a direct-fit option for riders rebuilding a worn or damaged top end. It suits dirt bike owners and race teams servicing four-stroke 450 singles.
Built For Performance
- Forged aluminum construction for strength under high-rpm loads
- 97 mm bore diameter matches the stock cylinder
- 13:1 compression ratio rated for high-compression builds
- Cross-referenced to OEM part 40254M09700
- Standard size keeps cylinder honing requirements minimal
- Designed for four-stroke 450cc single-cylinder engines
Fits These Machines
- for Yamaha YZ450F 2020
- for Yamaha YZ450F 2021
- for Yamaha YZ450F 2022
- for Yamaha YZ450F 2023
- for Yamaha YZ450FX 2020
- for Yamaha YZ450FX 2021
- for Yamaha YZ450FX 2022
- for Yamaha YZ450FX 2023
On-The-Job Use
- Top-end rebuilds on motocross tracks
- Off-road trail riding on YZ450FX models
- Race engine refresh between seasons
- Restoring lost compression on high-hour engines
Specs At A Glance
| Part Number(s) | 40254M09700 |
| Bore Size | 97 mm |
| Compression Ratio | 13:1 |
| Piston Type | Standard, forged |
| Engine Type | Four-stroke single |
Good To Know
Q: Does this piston fit my 2020 Yamaha YZ450F? A: It is listed against the YZ450F and YZ450FX for 2020 through 2023 with a 97 mm bore at 13:1 compression. Confirm your model year and bore size before ordering.
Q: What else should I replace during a top-end rebuild? A: Rings, wrist pin, and circlips are commonly replaced alongside the piston. Check cylinder condition and measure clearance to decide whether honing is needed.
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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