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2001 > 400 SX RACING > ENGINE > TRANSMISSION II
You can loosen the chain tension from the adjusters at the end of the swing arm. Then remove the mud guard (If exists) covering the front sprocket. Remove the M10 X 18mm bolt holding the sprocket. Slide the sprocket and chain off the spline and change out. If unable to slide off the spline you can always open the master link on the chain and do same step.
Use reverse process to re-install new sprocket. Readjust chain tension and make sure to re-tighten axel nuts. Good idea to use Locktite on the 10 x 18 bolt and spring washer holding the front sprocket. Replace mud guard or leave off as to your preference.
Kind regards,
TF
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