2006 Arctic Cat ATVs 400/400TBX/400TRV/500/500TBX/500TRV/650H1/650 V-Twin Service Manual, Page 333Get this manual

2006 Arctic Cat ATVs 400/400TBX/400TRV/500/500TBX/500TRV/650H1/650 V-Twin Service Manual, Page 333

6If clearance is excessive, measure the journals of the camshaftNOTE: If the journals are worn, replace the camshaft; then
V-BELT COVER Disassembling 2Manually extend the weightsThe pin (D) should retract and the weights should move without binding
and return when releasedPin (D) should extend when the weights are releasedNOTE: If any binding or resistance other than
the spring tension is felt, the automatic compression release must be replaced 1Remove the three cap screws securing the
engine brake actuator to the V-belt cover; then remove the actuator assembly and engine brake coverAccount for an O-ring
and seal 3Check that the shaft (A) rotates and the pin (B) is not broken, chipped, or worn flatNOTE: Do not remove shaft
(A) or pin (B) as they are not serviceable and cannot be reassembledThe camshaft assembly must be replaced if any defects