1999-2004 Honda TRX400EX FourTrax Service Manual, Page 165Get this manual
FRONT WHEELISUSPENSIONISTEERING Slide the boot off the throttle cable adjuster Loosen the cable adjusterBend down the lock washer tab and remove the pivot nut, lock washer, throttle arm and return spring, then the throttle lever with the plastic washerDisconnect the throttle cable from the throttle armRemove the dust seal from the housing bottom
ASSEMBLY
Apply grease to the thronle lever pivot in the housingCoat new dust seal lip with grease and install it into the housing until it is fully seatedConnect the cable to the throttle armInsert the throttle lever with the washer into the housing and install the throttle arm with the spring over the throttle lever pivot by aligning the flat surfacesInstall new lock washer and the pivot nutTighten the pivot nut and bend up the washer tab against the nutInstall the housing cover with new gasket and tighten the three screws