VERTEX complete top-end kit, cast piston: a ready-to-use set for the overhaul of your motocross engine. This kit gathers all the necessary parts for replacing the piston and sealing elements to save time during the workshop intervention or at the track.

• Included: piston
• rings
• piston pin
• circlips
• top-end gaskets
• needle cage (for 2T applications)
• The 4T kits include a timing chain

Main features:

• Manufacturer reference: VTK24370C
• Brand: VERTEX
• Material: aluminum (cast piston)
• Piston compression: Standard
• Bore diameter: 47.50 mm
• Piston diameter: Ø 47.470 mm (oversize letter: C)
• Universe: Motocross / off-road

Compatible with several 85 cc models including the YAMAHA YZ 85 (2025-2026) and listed Big Wheel versions. This kit simplifies the restoration of the top-end by grouping together the piston, rings, and assembly components for a clean and organized installation. Ideal for demanding riders who wish to replace the entire piston/crankpin assembly without searching for each part separately.