2006 Buell Lightning XB9SX, XB12S, XB12Scg & XB12Ss Factory Service Manual (P/N 99490-06Y)

This 2006 Buell Lightning Models Service Manual, P/N 99490-06Y, covers the XB9SX CityX, XB12S, XB12Scg, and XB12Ss Lightning Long, including the XB12 interactive exhaust system.

The 638-page PDF contains seven service chapters and five technical appendices, with searchable text and embedded PDF bookmarks.

• Engine repair: Engine rotation and removal, cylinder-head and piston service, cam-gear timing, crankcase disassembly, and oil-pump inspection.

• Primary drive and transmission: Wet-clutch repair, primary-chain adjustment, drive-belt service, and internal five-speed transmission disassembly, inspection, bearing replacement, and reassembly.

• Chassis and brakes: Front-fork overhaul, steering-head and wheel-bearing service, master-cylinder and caliper rebuilding, brake bleeding, and suspension adjustment.

• DDFI diagnostics: Trouble-code flowcharts, no-start and misfire diagnosis, fuel-pressure and intake-leak tests, and throttle position sensor (TPS) calibration.

• Variant-specific systems: XB12 interactive-exhaust actuator and cable service, California evaporative-emissions equipment, and Japanese active-intake solenoid testing and adjustment.

• Electrical troubleshooting: Starter current-draw tests, charging-system diagnosis, starter-interlock checks, wiring diagrams, and electrical connector locations.

This manual suits technicians and experienced owners familiar with mechanical repair and electrical diagnosis; internal overhaul work calls for precision measuring tools and specialized workshop equipment.

Engine Repair and Service Specifications

The air-cooled 984cc and 1203cc V-twin sections cover compression and cylinder-leakage testing, valve-guide and seat work, hydraulic lifters, and pinion-shaft bearing selection. Bearing-race procedures include lapping; inner-race grinding is assigned to a competent machinist.

Routine maintenance schedules are backed by fluid-capacity and brake-fluid level specifications, new-component dimensions, and service wear limits. Component-specific torque tables cover assemblies throughout the motorcycle, including primary chaincase and clutch inspection covers and spark plugs.

Clutch and Five-Speed Transmission

Gearbox repair extends to the mainshaft, countershaft, shift drum, shift forks, and main-drive gear. Internal transmission service requires engine removal and crankcase splitting. The Transmission Power Flow diagram traces operation through neutral and each gear.

The clutch section distinguishes XB9 and XB12 diaphragm springs and explains how excessive spring compression can damage the pressure plate. Drive-belt handling cautions address damage from bending, twisting, or rolling the belt onto a sprocket.

Chassis, Brakes, and Model Differences

Suspension settings distinguish the Scg and Lightning Long configurations, with fork-service data for both fork sizes. Brake repair includes piston and seal inspection; routing drawings show the XB12Ss rear brake-line arrangement.

VIN decoding tables distinguish the coding formats used before and after May 2005 and identify market configurations.

DDFI, Interactive Exhaust, and Active Intake

Dynamic Digital Fuel Injection diagnostics address ECM power loss and individual sensor, injector, ignition-coil, and cooling-fan faults. Specified equipment includes Digital Technician (HD-44750) and the Breakout Box (HD-42682). The maintenance chapter documents TPS zeroing and recalibration.

Code 21 charts cover the XB12 exhaust actuator, cable, control circuit, and position feedback. Japan-only Code 22 charts address active-intake solenoid faults, with cable and throttle-stop adjustment procedures. California EVAP coverage adds carbon-canister troubleshooting and hose routing.

Starter Tests and Electrical Schematics

Starter repair includes armature and brush inspection plus solenoid pull-in, hold-in, and return tests. Charging-system procedures cover stator resistance, AC output, and regulator checks.

Named wiring diagrams include Main Harness, Engine Management Circuit, Starting Circuit, and Charging Circuit. The connector-location table lists identifiers ranging from [10] through [179], linking circuit references to physical locations so a fault can be traced from the schematic to the motorcycle. AMP Multilock, Deutsch, and Packard terminal-service procedures support harness repairs.

Safety Note: Before beginning maintenance, verify that the motorcycle is securely stabilized on a lift or stand. Follow the manual’s procedure-specific battery-disconnection requirements for electrical service and major teardowns.

File Contents and Readability

Included pages: Chapters 1–7 occupy 570 pages, including their contents and blank pages. The 64 appendix pages comprise Tools (10), Wiring (30), Metric Conversions (2), Hose and Wire Routing (14), and Active Intake System—Japan Only (8).

The title page and blank reverse account for two pages; the appendix contents page and blank reverse account for another two. All are already included in the total.

The appendices precede Chapter 1 in this file. Detailed section bookmarks supplement abbreviated top-level labels. Small pin numbers, connector identifiers, and wire-color codes on dense wiring sheets are best read with zoom.