How to change an alternator on 2002 r1 - 2002 Yamaha YZF-R1

If you are talking about the stator, you need to remove the left engine side cover, remove the bolt that is holding the fly wheel to the crankshaft, then use a flywheel puller to get the flywheel off the crankshaft, then remove the 3 screws holding the stator to the cases. Unplug the electrical connection for the stator and reverse the procedure for reassembly. Use a new gasket, and be sure to apply Yamabond 4 to the case cover across the rubber plug for the wires and extend the yamabond down the cover gasket surface about 1" past the rubber on each side.
Use some lock tite when putting the screws back in to the new stator. You do not want them coming loose on you!
Make sure you get the bolt holding the flywheel tight when going back together.
That should fix you up!
Thanks
RSRBOB