⚠️ SAFETY FIRST: Always wear eye protection when working with pullers. Never attempt to "pry" the flywheel off with a screwdriver or hammer it directly, as this can easily warp the crankshaft or damage the sensitive magnets inside the rotor.
This tutorial demonstrates the correct procedure for removing the Yamaha YZF-R125 flywheel using the proper specialized tools. Whether you are replacing a faulty stator or performing a full engine teardown, these steps ensure the rotor is removed without damaging the crank taper.
Key Technical Highlights:
Cover Removal: Gaining access to the flywheel by removing the left-hand engine casing.
Holding the Crank: Techniques for securing the flywheel to loosen the main retaining nut.
Using the Puller: Step-by-step on threading the flywheel puller tool into the rotor and applying pressure to "pop" it off the taper.
Woodruff Key Caution: A reminder to locate and safely store the small woodruff key that locks the flywheel in position on the crankshaft.
Stator Inspection: What to look for once the flywheel is removed, including signs of burnt coils or oil contamination.
Torque Specifications & Technical Data
Accurate torque is critical for the flywheel to ensure it doesn't shear the woodruff key during operation:
Flywheel (Rotor) Nut: 60 Nm (6.0 m·kg, 43 ft·lb) — Apply a small amount of engine oil to the threads before installation.
Stator Coil Bolts: 7 Nm (0.7 m·kg, 5.1 ft·lb) — Use a drop of blue thread locker (Loctite) on these bolts.
Pickup Coil Bolts: 10 Nm (1.0 m·kg, 7.2 ft·lb)
Left Engine Cover Bolts: 10 Nm (1.0 m·kg, 7.2 ft·lb)
Pro Tip: If the flywheel is stuck even with the puller under high tension, do not just keep turning the puller bolt. Instead, give the head of the puller bolt a sharp, firm tap with a brass hammer. The shock vibration usually breaks the taper seal instantly. Also, ensure the crankshaft taper and the inside of the flywheel are perfectly clean and degreased (using brake cleaner) before reassembly to ensure a solid mechanical bond.
Removing the flywheel generator rotors and stator
Yamaha YZF R125 testing the generator , alternator , stator rotor .
First off remove all bolts for cover
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