1982 Yamaha XS400 Motorcycle Service Manual • P/N 12E-28197-80
Yamaha Models Covered & Key Technical Specifications
Models: Yamaha XS400
Model Years: 1982
Serial Numbers: 12E-000101 and up
Technical Data:
- Engine idle speed: 1,200 ± 50 r/min
- Standard spark plug: DR8ES-L
- Spark plug gap: 0.6–0.7 mm (0.023–0.028 in)
- Spark plug torque: 20 Nm (14.5 ft-lb)
- Compression pressure (standard): 980 kPa (142.2 psi)
- Compression pressure (minimum): 785 kPa (113.8 psi)
- Compression pressure (maximum): 1,079 kPa (156.4 psi)
- Intake valve clearance (cold): 0.11–0.15 mm (0.004–0.006 in)
- Exhaust valve clearance (cold): 0.16–0.20 mm (0.006–0.008 in)
- Drive chain deflection: Approximately 30 mm (1.2 in)
- Front fork oil capacity: 263 cm³ (8.9 US oz)
- Rear wheel axle torque: 105 Nm (75 ft-lb)
- Oil drain plug torque: 43 Nm (31.0 ft-lb)
- Oil filter bolt torque: 15 Nm (11.0 ft-lb)
Yamaha Manual Features & Content Preview
1982 Yamaha XS400 Factory Service Manual
Stop guessing torque values and start turning wrenches with confidence. This 317-page OEM workshop manual (Yamaha publication 12E-28197-80) provides the exact engineering baselines needed to maintain, diagnose, or completely rebuild your 1982 Yamaha XS400. Tailored specifically for the 12E-series powertrain, it delivers the authoritative factory data mechanics rely on for professional-grade restorations.
- Instant PDF download: Drop the fully indexed, searchable file straight onto your shop laptop or tablet the second your payment clears. Find exact specs right at the workbench without flipping through greasy paper.
- Covers complete engine overhauls, chassis alignment, and detailed electrical system diagnostics.
- Features dozens of high-resolution exploded-view diagrams, precise torque specification tables, and valve shim selection charts.
- Includes detailed engine identification and serial number tracking strictly for the 1982 model year.
Inside the Shop Documentation
Forget generic aftermarket advice. This manual breaks the motorcycle down into seven practical sections designed for actual garage workflow. It starts with frame and engine identification codes to ensure you order the right parts before tearing anything down. From there, it establishes strict periodic service intervals for lubrication, valve clearances, and chain tension adjustments.
When a major project hits the bench, the guide outlines complete engine tear-downs. You get the exact sequential steps for piston, cylinder, and camshaft removal. Dedicated chapters also map out the fundamentals of carburetor synchronization, chassis geometry setups, and step-by-step procedures for tracking down elusive wiring faults in the electrical harness.
Technical Specifications & Clearances
Precision is everything in engine building. This documentation is packed with the hard numbers required to dial in your 12E-series drivetrain safely. For top-end assembly, intake valve clearances are strictly listed at 0.11–0.20 mm, while a healthy cylinder should hit a compression pressure of 980 kPa at sea level.
Structural integrity requires exact fastener torque. The factory dictates 15 Nm for the oil filter bolt and a solid 105 Nm for the rear axle. Tracing electrical issues is easier with documented charging system baselines (1.2 amps for 10 hours) and proper headlight beam adjustment steps. For safe handling, chassis setups cap the drive chain deflection limit at 30 mm and require a rear brake adjustment range of 20–30 mm.
A quick reminder for the garage: Wrenching on vintage motorcycles carries inherent safety risks. The technical figures highlighted above are provided merely to illustrate the manual's depth. Always consult the complete factory data tables within this documentation and follow standard mechanical safety protocols before beginning any hands-on repair work.
Document Reference: 12E-28197-80
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