OEM Grade Piston Kit Size B Compatible with Honda CR85RB Expert 85 2003-2007 CR85R 85 2003-2007 85cc Liquid-Cooled 2-Stroke 47.45mm Standard Bore Motocross 13120-GBF-B00 13120-GBF-B40

APPLICATIONS:
Honda CR85R Motocross Motorcycle (2003-2007):
• CR85R 85 (2003-2007)
Honda CR85RB Expert Motocross Motorcycle (2003-2007):
• CR85RB Expert 85 (2003-2007)
• Engine: 84.7cc Liquid-Cooled Single-Cylinder 2-Stroke Reed Valve
• Bore x Stroke: 47.5mm x 47.8mm
• Compression Ratio: 8.4:1
• Location: Top End / Cylinder Assembly
• Component: Piston Kit Size B (Standard Bore, 47.45mm)

REPLACES PART NUMBERS:
• Honda 13120-GBF-B00
• Honda 13120-GBF-B40
• Pro-X 01.1113.B

SPECIFICATIONS:
• Type: Piston Kit Size B (Standard Bore)
• Piston Size: 47.45mm (Size B for Standard 47.5mm Bore)
• Bore x Stroke: 47.5mm x 47.8mm
• Displacement: 84.7cc
• Compression Ratio: 8.4:1
• Kit Includes: Piston, Rings, Wrist Pin, Circlips
• Material: Cast Aluminum Alloy Piston
• Engine: 84.7cc Liquid-Cooled Single-Cylinder 2-Stroke
• Fitment: Direct Drop-In Replacement

PRODUCT DETAILS:
This piston kit is a direct replacement for Honda CR85R and CR85RB Expert motocross motorcycles with the 84.7cc liquid-cooled single-cylinder 2-stroke reed valve engine. The 47.45mm Size B piston is designed for the standard 47.5mm cylinder bore providing correct piston-to-wall clearance for optimal ring seal in the CR85R 85 and CR85RB Expert 85 from 2003 through 2007. Each kit includes cast aluminum alloy piston, precision-fitted piston rings, hardened wrist pin, and retaining circlips for all compatible Honda CR85 motocross applications. Manufactured using low-expansion piston alloy and precision machined on CNC equipment for consistent dimensions and reliable performance in the Honda 85cc 2-stroke engine. Installs directly into the standard 47.5mm cylinder bore without modifications for piston replacement or top-end rebuild on all compatible Honda CR85R and CR85RB Expert models.