Piston Pin Compatible With 1985-1998 Suzuki Quadracer 250 Rm 250 Honda Atc-R 250 18Mm Wrist Pin Top

Manufacturer Part Number:
04.1856

Cross-Reference OEM Part Numbers:
Suzuki: 12151-13A00-0A0
Honda: 13111-KSK-730
Honda: 13111-KZ3-000
KTM: 54730033000
KTM: 54830233000
KTM: 55430033000
Husqvarna: 800086817

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

Engine Specifications:
• Honda CR 250: 249cc 2-Stroke — 66.4mm × 72mm bore/stroke
• KTM SX/EXC 250: 249cc 2-Stroke — 66.4mm × 72mm bore/stroke
• KTM EXC/SX 300: 293cc 2-Stroke — 72mm × 72mm bore/stroke
• KTM EXC/SX 360: 359cc 2-Stroke — 76mm × 79mm bore/stroke
• KTM EXC/SX/MXC 380: 368cc 2-Stroke — 78mm × 77.2mm bore/stroke

Notes:
• One of the most widely cross-referenced 18mm piston pins in powersports
• Fits Honda, Husqvarna, KTM, and Suzuki 2-stroke engines from 250cc to 380cc
• 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
• Cross-references across 4 major manufacturers — verify OEM part number match
• Competition 2-stroke engines see extreme loads — inspect pin at every rebuild

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