Vertex Cast Race Evolution Piston Kit - Yamaha YZ 85
Part number: 24503B
$119.95
Description
Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Specifications Cylinder Diameter: 47.5mm Displacement: 85cc Piston O.D.: 47.46mm Vehicle Fitment Yamaha YZ 85 (2002-2025) Yamaha YZ 85 Big Wheel (2022-2025) Vertex Pistons are precision-engineered for maximum performance and durability. Each kit is manufactured to OEM specifications with premium materials for a perfect fit. Backed by Vertex's quality guarantee.
Specifications
| compression ratio | STD |
|---|---|
| cylinder diameter | 47mm |
| displacement | 85cc |
| part type | Cast Race Evolution Piston Kit |
| piston od | 47.46 |
| vehicle type | Dirt Bike |
Listed vehicle applications
| Year | Make | Model | Notes |
|---|---|---|---|
| 2025 | Yamaha | YZ 85 | Catalog application: 2025 Yamaha YZ 85. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2024 | Yamaha | YZ 85 | Catalog application: 2024 Yamaha YZ 85. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2023 | Yamaha | YZ 85 | Catalog application: 2023 Yamaha YZ 85. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2022 | Yamaha | YZ 85 | Catalog application: 2022 Yamaha YZ 85. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2021 | Yamaha | YZ 85 | Catalog application: 2021 Yamaha YZ 85. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2020 | Yamaha | YZ 85 | Catalog application: 2020 Yamaha YZ 85. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2019 | Yamaha | YZ 85 | Catalog application: 2019 Yamaha YZ 85. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2018 | Yamaha | YZ 85 | Catalog application: 2018 Yamaha YZ 85. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2017 | Yamaha | YZ 85 | Catalog application: 2017 Yamaha YZ 85. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2016 | Yamaha | YZ 85 | Catalog application: 2016 Yamaha YZ 85. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2015 | Yamaha | YZ 85 | Catalog application: 2015 Yamaha YZ 85. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2014 | Yamaha | YZ 85 | Catalog application: 2014 Yamaha YZ 85. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2013 | Yamaha | YZ 85 | Catalog application: 2013 Yamaha YZ 85. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2012 | Yamaha | YZ 85 | Catalog application: 2012 Yamaha YZ 85. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2011 | Yamaha | YZ 85 | Catalog application: 2011 Yamaha YZ 85. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2010 | Yamaha | YZ 85 | Catalog application: 2010 Yamaha YZ 85. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2009 | Yamaha | YZ 85 | Catalog application: 2009 Yamaha YZ 85. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2008 | Yamaha | YZ 85 | Catalog application: 2008 Yamaha YZ 85. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2007 | Yamaha | YZ 85 | Catalog application: 2007 Yamaha YZ 85. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2006 | Yamaha | YZ 85 | Catalog application: 2006 Yamaha YZ 85. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2005 | Yamaha | YZ 85 | Catalog application: 2005 Yamaha YZ 85. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2004 | Yamaha | YZ 85 | Catalog application: 2004 Yamaha YZ 85. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2003 | Yamaha | YZ 85 | Catalog application: 2003 Yamaha YZ 85. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2002 | Yamaha | YZ 85 | Catalog application: 2002 Yamaha YZ 85. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2025 | Yamaha | YZ 85 Big Wheel | Catalog application: 2025 Yamaha YZ 85 Big Wheel. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2024 | Yamaha | YZ 85 Big Wheel | Catalog application: 2024 Yamaha YZ 85 Big Wheel. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2023 | Yamaha | YZ 85 Big Wheel | Catalog application: 2023 Yamaha YZ 85 Big Wheel. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
| 2022 | Yamaha | YZ 85 Big Wheel | Catalog application: 2022 Yamaha YZ 85 Big Wheel. Piston OD 47.46 mm; Cylinder 47.5mm. Cast Race Evolution Piston Kit. Includes (Piston, Ring, Wrist Pin, & Circlips). Motocross & Enduro racing team tested and proven. Built specifically for racing applications with a special racing profile, reduced top ring land, nitride 0.8mm steel ring, exclusive MoS2 coating featured with specific pockets to facilitate cylinder/piston smoothness. Source: Vertex Pistons Catalog 1-21-2026. Reviewed 2026-09-23. |
Check the exact vehicle application and specifications before ordering. Ask HPE if a detail is missing.