03.2309 Pro-X Connecting Rod Kit for Yamaha YZ250X 2016-2026 YZ 250X

Connecting Rod Kit for Yamaha YZ250X

This Pro-X connecting rod kit is a complete crankshaft rod assembly for the Yamaha YZ250X, cross-referenced to OEM number 03.2309 and built to bring a worn two-stroke bottom end back to spec.

Overview

This connecting rod kit for Yamaha is the link between piston and crankshaft on the YZ250X, handling the repeated high-load cycles of two-stroke motocross and off-road riding. It is aimed at riders and engine builders doing a full bottom-end rebuild who want a rod assembly that matches factory dimensions. The kit includes the rod, bearing, and thrust washers so the crank can go back together without chasing individual parts.

Built For Performance

• Forged steel rod for strength under repeated two-stroke combustion loads
• Precision-ground big-end and small-end bores for consistent fitment
• Includes matched bearing and thrust washers for complete assembly
• Heat-treated bearing surfaces for long service in high-rpm use
• Balanced design to help keep vibration controlled at wide-open throttle
• Cross-referenced as part number 03.2309 for easy lookup

Fits These Machines

• for Yamaha YZ250X 2016
• for Yamaha YZ250X 2017
• for Yamaha YZ250X 2018
• for Yamaha YZ250X 2019
• for Yamaha YZ250X 2020
• for Yamaha YZ250X 2021
• for Yamaha YZ250X 2022
• for Yamaha YZ250X 2023
• for Yamaha YZ250X 2024
• for Yamaha YZ250X 2025
• for Yamaha YZ250X 2026

On-The-Job Use

• Bottom-end rebuilds after rod bearing wear or crank failure
• Engine refreshes on high-hour YZ250X woods and hare scramble bikes
• Race prep where the crank is pressed apart for inspection
• Trail and enduro maintenance schedules requiring a fresh rod assembly

Specs At A Glance

Good To Know

Q: Is the bearing included with the rod? A: Yes, this connecting rod kit includes the matched big-end bearing and thrust washers needed for assembly. Match the part number to your engine before ordering.

Q: Do I need special tools to fit this rod? A: Yes, installing a connecting rod calls for a hydraulic press and crankshaft truing equipment. Have a qualified engine shop handle the assembly and balancing.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.