MASSIVE 950 PAGES WORKSHOP MANUAL FOR YOUR ROAD KING 2006 MODEL, COVERS ALL YOU NEED TO KNOW


1.1 General
1.2 Maintenance Schedule
1.3 Engine Oil/Filter
1.4 Air Cleaner
1.5 Tires .
1.6 Wheel Spokes
1.7 Primary Chain/Lubricant
1.8 Clutch Adjustment .
1.9 Transmission Lubricant
1.10 Drive Belt .
1.11 Throttle Cables
1.12 Enrichener Control
1.13 Fuel System
1.14 Brakes
1.15 Spark Plugs
1.16 Engine Idle Speed
1.17 Front Fork Oil
1.18 Steering Head Bearings
1.19 Critical Fasteners
1.20 Battery
1.21 Troubleshooting

As you can it covers everything, BUT best off all its the cheapest

;-)