Yamaha YZ 250 Cylinder Barrel Bore Jug Block 66.4mm Nikasil YZ250 1999-2026

66.4mm Nikasil Cylinder – Yamaha YZ250 (1999–2026)

Restore your engine’s performance with the Motojoy Cylinder, designed for Yamaha YZ250 models from 1999 to 2026. Featuring a 66.4mm bore with a high-quality Nikasil coating, this cylinder jug provides excellent wear resistance, improved heat transfer, and long service life for two-stroke engines.

Manufactured by Motojoy to meet OEM specifications, this YZ250 cylinder block ensures precise piston fitment, consistent compression, and reliable power delivery. It is an ideal solution for top-end rebuilds, worn cylinders, or performance restoration, whether for motocross, trail riding, or race use.

Key Features:

• Direct Replacement for Yamaha OEM Part: 5UP-11311-21, 5UP-11311-00 & 5UP-11311-01

• 66.4mm bore with durable Nikasil coating

• Manufactured by Motojoy

• Designed to meet or exceed OEM specifications

• Excellent heat dissipation and reduced friction

• Direct-fit replacement for easy installation

A reliable and cost-effective Yamaha YZ250 cylinder barrel option for riders who want dependable performance and long-term durability.