2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 69Get this manual
INTRODUCTION PERIODIC MAINTENANCELUBRICATION EBS00029
PERIODIC CHECKS AND ADJUSTMENTS
INTRODUCTION
This chapter includes all information necessary to perform recommended checks and adjustmentsThese preventive maintenance procedures, if followed, will ensure more reliable machine operation and longer service lifeThe need for costly overhaul work will be greatly reducedThis information applies to machines already in service as well as to new machines that are being prepared for saleAll service technicians should be familiar with this entire chapterEBS00030
PERIODIC MAINTENANCELUBRICATION
INITIAL ITEM ROUTINE Check valve clearance Adjust if necessary Check for coolant leakage Repair if necessary Replace coolant every 24 months Check condition Adjust gap and clean Replace if necessary Clean Replace if necessary Check starter (choke) operation Adjust engine idling speed Check breather hose for cracks or damage Replace if necessary Check for leakage Tighten if necessary Replace gasket if necessary Clean Check fuel hose for cracks or damage Replace if necessary Replace (Warm engine before draining) Replace Check and adjust slackalignmentcleanlube Check free playoperationfluid leakage See NOTE Correct if necessary Check operationfluid leakageSee NOTE Correct if necessary Check operation Adjust if necessary Check balancedamagerunout Replace if necessary Check bearing assemblies for loosenessdamage Replace if damaged Check operationRepair if damagedCheck toe-inAdjust if necessaryEvery 2040 hours (More often in wet or dusty areas