General rule of thumb... when packing any bearing with grease... 2/3rds full. Gives plenty of lube with space to expand when it gets warm.

That includes all radial ball, angular contact ball, roller, angular contact roller and needle bearings too I believe.

Just for those who didn't know

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09 XT660X:

CCC Stainless Rounds, Stage 1 DNA, Stage 2 DNA, PCV With Custom Autotune Map, PCV AutoTune, Home made O2 eliminator, Self machined Fork Spacers, DIY Autotune Switch.