See what R125 are for sale now on Ebay uk
buy a haynes workshop manual from here
Easy job , if you need to test the stator coils try this post here
Yamaha YZF R125 testing the generator , alternator , stator rotor .
First off remove all bolts for cover
it should pull of easy with a little magnetic resistance
coils off the engine make sure they are clean and oil free
Next the flywheel / rotor is to be removed
Fly wheel nut a good impact gun will get it off easy
you then need a universal flywheel puller
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