XT660R

Numbers

Front Axle Allen Key14mm
Rear Axle Nut22mm
Chain Slack40-50mm
Spark PlugNGK CR7E
Front Brake PadsEBC FA209/2
Rear Brake PadsEBC FA213
Oil2.9L
(fill 2L, pause to let it flow down, fill last 0.9L)

Equivalent parts

The brake pads are the same (both front and rear) as a Husky 701

Footpegs are compatible with the XT250 (08-18), YZ/WR 125/250/500 (91-96), YZ80 (91-04), XTZ750 Super Ten (89-18) and Husky TC85: https://pivotpegz.com/search?q=PP-16