Piston Pin Compatible With 1984-2001 Honda Cr 500 20Mm 2-Stroke Wrist Pin 13111-Ml3-680 Motocross

Manufacturer Part Number:
04.2069

Cross-Reference OEM Part Numbers:
Honda: 13111-KA5-740
Honda: 13111-ML3-680

Pin Specifications:
• Outer Diameter: 20mm
• Material: Case-hardened chrome steel

Engine Specifications:
• 498cc 2-Stroke Single Cylinder — Liquid Cooled
• Bore × Stroke: 89mm × 80mm
• One of the most powerful 2-stroke motocross engines ever produced

Notes:
• The Honda CR 500 is legendary in motocross — massive 500cc 2-stroke power
• Replace during top-end rebuild or when pin shows wear
• Two OEM cross-references reflect different production generations
• Always replace circlips when removing pin

Function:
The piston pin (also called a wrist pin or gudgeon pin) is the hardened steel shaft that connects the piston to the connecting rod small end. It transfers combustion force from the piston to the connecting rod while allowing the rod to pivot as the crankshaft rotates. A worn, scored, or loose piston pin causes knocking noise, accelerated bore wear, and potential catastrophic engine failure.

When to Replace:
• During any top-end rebuild (piston, rings, cylinder re-bore/re-plate)
• When pin shows visible wear, scoring, discoloration, or blue heat marks
• When pin has measurable play in the connecting rod small end bearing
• Recommended every 2nd piston replacement even if pin appears serviceable

Installation Notes:
• Always replace piston pin circlips — never reuse old circlips
• Apply assembly oil or premix to pin before installation
• Ensure circlips are fully seated in their grooves — improper seating causes engine damage
• Verify connecting rod small end bearing condition before reassembly
• CR 500 produces extreme crankshaft loads — ensure rod bearing and big end are in spec
• Warm piston gently before pin installation — do not force on this high-stress engine

PRODUCT NOTICE:
As a parts distributor we mostly sell aftermarket parts (any OEM parts would be noted as such). Aftermarket parts are not sourced from the original vehicle or equipment manufacturer, but are designed to function the same as - if not better than - the original. All parts sold are new.

WARNING - This product may expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov