Piston Pin Compatible With 1982-2002 Suzuki Rm 250 Rmx 250 18Mm X 58Mm Wrist Pin 12151-00B20 Top End

Manufacturer Part Number:
04.1858

Cross-Reference OEM Part Numbers:
Suzuki: 12151-00B20
Suzuki: 12151-15002
Suzuki: 12151-28C00
Suzuki: 12151-45501

Pin Specifications:
• Outer Diameter: 18mm
• Length: 58mm
• Material: Case-hardened chrome steel

Engine Specifications:
• Suzuki RM 250: 249cc 2-Stroke Single Cylinder — Liquid Cooled
• Suzuki RM 500: 498cc 2-Stroke Single Cylinder — Liquid Cooled
• Suzuki RMX 250: 249cc 2-Stroke Single Cylinder — Liquid Cooled

Notes:
• Same pin used across RM 250 (multiple generations), RM 500, and RMX 250
• Multiple OEM cross-references reflect different production years
• Replace during top-end rebuild or when pin shows wear
• 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
• Competition 2-stroke engines see extreme loads — inspect pin at every rebuild
• RM 500 is a high-output engine — pay extra attention to pin and rod bearing condition

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