1999-2002 TRX400EX Fourtrax Service Manual, Page 47Get this manual
MAINTENANCE
DRIVE CHAIN
CHAIN SLACK INSPECTION
Never inspect and adjust the drive chain while the engine is runningTurn the ignition switch OFF, shift the transmission into neutralCheck the slack in the drive chain upper run midway between the sprocketsCHAIN SLACK 3040 mm 11-141-58 in) BEARING HOLDER DRIVE CHAIN
ADJUSTMENT
Loosen the axle bearing holder pinch boltsTurn the axle bearing holder until the correct drive chain slack is obtained, using the hex wrench in the tool kit as shownTighten the holder pinch boltsTORQUE 21 Nm (2.1 kgfm, 151bHt) Recheckthe drive chain slack and free wheel rotationIf the chain slack is excessive when the bearing holder is turned fully rearward (the correct slack cannot be obtained), replacethe drive chain with new oneTo replace th rive chain, remove th rive sprocket cover (page 6-2) and swingarm (page 13-13)