LA Sleeve YZ125 2005-2017 Sleeve and Piston Kit LAS-5533K-1

Your YZ125's top-end is the foundation of its power delivery—and factory components wear fast under racing demands. The LA Sleeve Sleeve and Piston Kit delivers a complete, precision-matched rebuild solution that restores compression, improves ring seal, and unlocks reliable horsepower gains across the entire RPM band. If you're serious about performance, this is the upgrade that makes a measurable difference.

Built around Moly2000 centrifugally-spun cast technology, this kit combines a durable cylinder sleeve with a pro-forged or pro-cast piston engineered for optimal clearances and thermal stability. You get everything needed for a proper top-end rebuild—gasket set, wrist pin bearing, and matched components—so installation is straightforward for experienced mechanics.

• Moly2000 cast cylinder sleeve
• Pro-forged piston option
• Pro-cast piston option
• High-quality wrist pin bearing
• Complete gasket set included
• Precision-matched components
• Improved ring seal
• Enhanced compression
• Yamaha YZ125 fitment
• 2005–2017 model years
• 2-stroke engine designed
• Bolt-on installation