⚠️ SAFETY FIRST: Ensure the engine is cold and the bike is on a stable paddock stand. Work in a dust-free environment to prevent contamination of the internal engine components.
This specialized guide covers the final stages of a Yamaha YZF-R125 clutch rebuild, focusing on the assembly of the clutch boss, pressure plates, and the critical alignment of internal components. Perfect for riders performing a full refresh or solving persistent "dragging" issues.
Key Technical Highlights:
Clutch Boss & Basket: Visual guide to seating the clutch boss correctly and ensuring the thrust washer is in place.
Plate Sequencing: Step-by-step order for friction and steel plates, including the orientation of the jagged edges on the steel plates.
Pressure Plate Alignment: How to align the "dot" or arrow marks to ensure the pressure plate sits flush and operates smoothly.
Actuator Mechanism: Proper installation of the pull lever and the tiny ball bearing that facilitates the clutch throw.
Torque Specifications & Technical Data
To ensure the rebuild is factory-spec, include these critical values:
Clutch Boss Nut: 70 Nm (50 ft·lb) — Use a holding tool to prevent the engine from turning.
Clutch Spring Bolts: 10 Nm (7.2 ft·lb) — Tighten in a star pattern.
Clutch Cover Bolts: 10 Nm (7.2 ft·lb)
Oil Capacity (with filter change): 1.00 L (Standard 10W-40 JASO MA)
Pro Tip: Before closing the side cover, manually pull the clutch arm on the engine to verify that the pressure plate is lifting evenly. It’s much easier to fix an alignment issue now than after you’ve refilled the engine with oil
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