New Crankshaft Main Bearing And Seal Kit Compatible With 2001-2003 Yamaha Yz125 124Cc 2-Stroke 5Ry

YAMAHA YZ125 2-STROKE MOTOCROSS — 124cc Single-Cylinder Liquid-Cooled (2001-2004):
• Yamaha YZ125 124cc 2-Stroke Single-Cylinder Liquid-Cooled (2001, 5RY Engine Code — Major Bottom-End Redesign Year)
• Yamaha YZ125 124cc 2-Stroke Single-Cylinder Liquid-Cooled (2002, 5RY Engine Code)
• Yamaha YZ125 124cc 2-Stroke Single-Cylinder Liquid-Cooled (2003, 5RY Engine Code)
• Yamaha YZ125 124cc 2-Stroke Single-Cylinder Liquid-Cooled (2004, 5XF Engine Code — Final Steel-Frame Year)
• Yamaha YZ125 54mm Bore × 54.5mm Stroke 2-Stroke YPVS Power Valve Race-Spec Motocross

SPECIFIC MODEL YEARS COVERED:
• Yamaha YZ125 2001 (Major Bottom-End Redesign — New Crankshaft Bearings)
• Yamaha YZ125 2002 (Refined 5RY Engine, Steel Chassis Era)
• Yamaha YZ125 2003 (5RY Engine Continued)
• Yamaha YZ125 2004 (5XF Engine — Final Year Before 2005 Aluminum-Frame Redesign)

NOTES:
• Compatible with Yamaha OEM crankshafts and aftermarket Hot Rods replacement crankshafts
• 2001 represents a major bottom-end redesign for the YZ125 with NEW crankshaft bearings (different from the 1998-2000 generation)
• 1998-2000 YZ125 uses different bearings (covered by separate K009 kit)
• 2005+ YZ125 uses different bearings (covered by separate kit) — 2005 introduced aluminum frame and revised bottom-end
• Quality alternative to expensive Yamaha OEM main bearings and crankshaft seals
• Recommended for any bottom-end rebuild, crankshaft replacement, or seal-out repair
• Bearings prelubed and packaged with waterproof grease; crank seals feature sealing lip designed to reduce crank pin wear
• YPVS power valve system requires correct seal orientation during installation
• 6-speed transmission with reed valve induction