1999–2000 Triumph Sprint ST & RS Service Manual (P/N 3850760)

• Covers 1999–2000 Triumph Sprint ST and Sprint RS models equipped with the 955 cc 3-cylinder DOHC engine
• Official Triumph publication Part Number 3850760, issue 3, October 1999
• Contains 16 indexed chapters including cylinder head, clutch, balancer, lubrication, cooling system, and electrical system modules
• Includes 9 detailed exploded-view diagrams illustrating engine, clutch, and chassis assembly sequences
• Features a complete torque-wrench setting index for over 100 chassis and engine fasteners
• Delivers searchable technical data for maintenance, including valve clearance charts and piston ring end-gap tolerances
• This 1999 edition is the primary reference for the 955 cc EFI Triumph Sprint ST and Sprint RS build, documenting the transition to sequential injection management.
• Details throttle body synchronization, steering geometry, transmission gearboxes, fuel injection mapping, and exhaust emission controls.
• Outlines brake caliper rebuilds, front fork servicing, final drive adjustment, frame inspection, wheel bearing replacements, and evaporative loss systems.

Factory Technical Scope

The 1999–2000 Triumph Sprint ST and Sprint RS service manual provides comprehensive technical information for the 955 cc in-line three-cylinder power plant in a highly detailed PDF format. Content focuses on internal engine architecture, including chapters on the cylinder head and camshaft timing, transmission gear ratios, and balancer shaft alignment. The manual documents maintenance schedules, fuel system troubleshooting, and cooling system specifications essential for the ongoing care of these fuel-injected factory workshop documentation structures. Performing step-by-step procedures outlined in this guide—such as adjusting valve clearances with variable thickness shims, synchronizing throttle body vacuums, replacing the cam chain tensioner, and servicing the front fork oil—provides mechanics with the exact factory workflows needed to avoid expensive dealership labor rates.

Expert Repair Considerations & Schematics

When approaching a major repair on the 955 cc engine, technicians must avoid specific mechanical traps unique to this Triumph triple. For example, completely releasing a single camshaft bearing cap without progressively loosening the entire sequence will crack the delicate aluminum head casting. Furthermore, when using Plastigauge to check journal clearances, failing to completely remove the oil-soluble residue will block internal oil galleries and cause rapid bearing failure. To support these critical tasks, the text is heavily illustrated with comprehensive wiring diagrams, exploded camshaft schematics, big end bearing selection charts, and precise Plastigauge measurement views. Working on high-performance motorcycles involves inherent risks, particularly concerning the high-voltage ignition systems and pressurized cooling circuits, so always prioritize personal safety and adhere to standard workshop protocols before undertaking any mechanical work.

Specification Highlights

This 410-page official Triumph publication includes precise tolerance data for both Sprint models, such as valve clearance ranges and crankshaft main bearing selection tables. Torque values for critical fasteners are documented throughout, including multi-stage cylinder head bolt sequences and big-end nut settings using torque-turn gauges. Crankshaft main bearing clearance is specified at 0.020–0.044 mm, while intake valve clearance is tightly listed at 0.10–0.15 mm. The cooling system capacity for the Triumph Sprint ST is documented at 2.8 liters. Ultimately, this manual equips the professional or dedicated DIYer with the exact parameters to restore original performance and maintain long-term reliability.