1994 – 2001 Yamaha YZ125 Cylinder – Removal

How to Remove your 1994 through 2001 Yamaha YZ125 Cylinder

The Tools You Will Need

• The Tools You Will Need To Service Your YZ125 Top End:
• Foot-Pound Torque Wrench → https://amzn.to/3FVEdr3
• Safety Glasses → https://bulltru.com
• Dremel with Sanding Disc → https://amzn.to/407t6l3
• 2-Stroke Oil → https://amzn.to/3WnyXSl
• Assembly Lube → https://amzn.to/4ar8mty
• Calipers → https://amzn.to/3BRoCXX
• Brake Cleaner → https://amzn.to/4jv9v7a
• Telescoping Bore Gauges → https://amzn.to/4g5reiE
• Feeler Gauge → https://amzn.to/4hd7qen
• Cylinder Brush → https://amzn.to/3W7Trhv
• 8mm Socket
• 10mm Socket
• ¼” Socket Wrench
• ⅜” Socket Wrench

The Specialty Tools You Will Need Are:

• Motion Pro Torque Wrench Adapter → https://amzn.to/3IUQnSg
• Machinists Straight Edge → https://amzn.to/4g4fSM1

Pre-Service Notes

• I recommend opening the Service & Torque Specs in a new tab for easy reference.
• If you need parts and tools, make sure to buy them here! → https://amzn.to/4h4lDKq
• Pictures with captions are below after step.
• If you need any help don’t hesitate to ask!

Yamaha YZ125 Cylinder Removal

• Mark the four cylinder base nuts 1 through 4 to follow a consistent pattern.
• Loosen the cylinder base nuts ¼ turn at a time to avoid binding; take as many passes as you need.
• Turn your piston to bottom dead center, and carefully lift your cylinder off the crankcase.
• If your cylinder is stuck, tap the cylinder with a mallet in multiple locations.
• DO NOT TWIST THE CYLINDER DURING REMOVAL!
• Before you do any cleaning or wiping, inspect your cylinder for any scratches or inconsistent wear patterns.

If you have any questions, please let me in the comments, or send me a DM!

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