Tips and Tricks
Cleaning up the bars on YFZ450, Getting rid of YFZ450 bog , Cheap tire balls

The next time you you replace the bearings in your YFZ450 swingarm drill and tap holes in the bottom for a couple of 90 degree grease fittings pointing toward the rear.  There is plenty of clearance and it lets you grease the swingarm very easy.

A strategically placed zip tie around the thumb throttle helps keep your thumb from slipping off.
Note-Safety wire on grips in addition to glue!

You can replace the YFZ450 rear master cylinder with one from a YZ bike with integrated reservoir. This does take a little modification to the master cylinder and some spacers.