1974-1980 Yamaha XS650 Service & Repair Manual FSM

• Original OEM publication (P/N LIT-1 1616-00-76) for 1974–1980 Yamaha XS650E, XS650G, and XS650SG models
• 213-page technical reference required for engine serial number 2F0-006501 and subsequent builds
• Features 82 precise diagrams, exploded-view illustrations, and comprehensive torque-specification tables for the parallel-twin platform

Component and System Documentation

This service manual delivers essential technical data and maintenance procedures for the SOHC parallel-twin platform. It breaks down engine removal, top-end overhauls, and complete bottom-end assemblies. You will find specific carburetion data for MIKUNI systems. Chassis chapters map out front and rear suspension settings, braking system diagnostics, and steering-head maintenance. Electrical sections cover charging-system checks, detailing A.C. generator tests and voltage-regulator adjustments. Proper shop safety protocols must be observed when working on these high-voltage electrical circuits and heavy engine components to prevent injury or equipment damage.

Engine and Chassis Specifications

Engine overhaul sections document precise clearances, listing standard intake valves at 0.10 mm and exhaust at 0.15 mm. The cylinder head specification tables note an operational intake range of 0.11–0.20 mm. Valve-seat width is set at 1.3 mm with a strict wear limit of 2.0 mm. For bottom-end assembly, primary drive gear torque sits at 90 Nm (65 ft-lb), while the clutch lock nut requires 65 Nm (47 ft-lb). Electrical maintenance data includes the 14.5 mm standard length for generator brushes.