This complete factory service repair manual covers the 1981 Yamaha XJ550 and XJ 550 RH motorcycles. The XJ550 featured a transverse DOHC inline-four 550 cc air-cooled engine with four individual carburetors, five-speed transmission, shaft drive, steel perimeter frame, telescopic front forks, dual front disc brakes, and TCI transistor-controlled ignition. The manual provides comprehensive overhaul procedures for the DOHC inline-four engine with valve clearance adjustment, carburetor synchronization for all four carbs, clutch and transmission rebuild, shaft drive final drive service, fork seal replacement, brake caliper overhaul, alternator stator and rectifier regulator testing, wiring diagrams with lighting and ignition circuits, timing chain service, and steering head bearing adjustment. Complete with exploded views, carburetor detail, wiring diagrams, and all torque specifications. Essential reading for Yamaha XJ550 owners and classic motorcycle service technicians.
1981 Yamaha XJ Models XJ550 550 RH 81 Service Repair Workshop Manual PDF
VEHICLE/EQUIPMENT INTRODUCTION:
The Yamaha XJ550, introduced for the 1981 model year, was part of Yamaha acclaimed XJ series of motorcycles that established the standard for Japanese inline-four street bikes in the late 1970s and early 1980s. The XJ lineage traced back to the groundbreaking 1979 XJ650, which featured a DOHC inline-four engine, cast aluminum frame, and shaft drive configuration. The XJ550 was developed as a mid-displacement variant aimed at riders seeking the smoothness and character advantages of an inline-four engine in a more manageable, middleweight package. The 550 cc displacement was strategically chosen for various international licensing and insurance markets that favored lower-displacement categories.
The XJ550 engine architecture featured a transverse mounted inline-four cylinder configuration with double overhead camshafts driven by a chain drive. This DOHC layout allowed efficient combustion chamber design with four valves per cylinder operated through rocker arms, a setup that provided excellent volumetric efficiency and smooth power delivery across a broad RPM range. The engine was fitted to a pressed-steel perimeter frame that provided adequate torsional rigidity for street riding, while the shaft final drive system eliminated the maintenance demands of chain drive and provided cleaner operation.
The XJ550 featured Yamaha Uni-Trak rear suspension in some variants, telescopic front forks, dual front disc brakes, and a single rear disc. The motorcycle was styled with the understated but attractive naked sport design that characterized the XJ range, featuring a round headlight, swept-back exhaust headers, and a comfortable riding position suitable for both commuting and touring. This manual provides the complete factory service and repair documentation for the 1981 Yamaha XJ550 and XJ 550 RH models.
SERVICE & REPAIR SCOPE:
- Complete inline-four engine overhaul including cylinder head, DOHC valve train, and cam chain service
- Piston and ring replacement, cylinder bore measurement, and hone procedure
- Connecting rod big-end bearing inspection, crankshaft runout measurement, and main bearing service
- Valve clearance inspection and adjustment using feeler gauge and shim selection
- Camshaft bearing clearance check and cam chain tensioner inspection
- Four-into-one exhaust system inspection, header pipe gasket replacement, and muffler repacking
- Carburetor synchronization for four Mikuni or BS-type carburetors, jet cleaning, and float level adjustment
- Clutch pack service: friction plate thickness measurement, steel plate flatness check, and clutch spring replacement
- Transmission overhaul: gear inspection, shift drum and fork service, and bearing replacement
- Shaft drive final drive overhaul: bevel gear lapping, pinion preload adjustment, and oil seal replacement
- Telescopic fork service: fork seal replacement, fork oil change, damper rod inspection, and spring rate check
- Rear shock absorber overhaul, preload adjustment, and damper rebuild
- Front dual disc brake caliper overhaul: piston seal replacement, pad fitting, and rotor warpage check
- Rear disc brake caliper service and brake disc thickness measurement
- Brake master cylinder rebuild and brake line bleed procedures
- Electrical system repair: alternator stator testing, rectifier regulator testing, ignition coil diagnosis
- Starter motor overhaul, starter clutch inspection, and solenoid service
- Battery charging system diagnostics and wiring harness continuity testing
- Steering head bearing adjustment, stem nut tightening, and bearing preload setting
TECHNICAL SPECIFICATIONS:
- Make: Yamaha
- Model: XJ550 (XJ 550 RH)
- Model year: 1981
- Engine type: Transverse inline-four cylinder, 4-stroke, air-cooled
- Valve train: DOHC, four valves per cylinder, chain-driven camshafts
- Bore and stroke: Approximately 56.5 mm x 43.8 mm (engine varies by variant)
- Displacement: 550 cc
- Compression ratio: Approximately 9.5:1
- Fuel system: Four individual carburetors (Mikuni BS type)
- Ignition: Transistor-controlled ignition (TCI)
- Transmission: Five-speed constant mesh
- Clutch: Wet multi-plate wet clutch
- Final drive: Shaft drive with bevel gear final reduction
- Frame: Steel pressed-steel perimeter/cradle
- Front suspension: Telescopic fork
- Rear suspension: Swingarm with dual shock absorbers or single shock (variant dependent)
- Front brakes: Dual disc
- Rear brake: Single disc
- Wheelbase: Approximately 1465 mm
- Seat height: Approximately 780 mm
DIAGNOSTIC INFORMATION:
- Perform compression test on all four cylinders and compare readings for acceptable consistency
- Set valve clearances to factory specification using feeler gauge at TDC compression stroke
- Check cam chain tensioner operation and listen for timing chain rattle at idle
- Sync all four carburetors using vacuum gauge bars and check idle mixture
- Test ignition coil primary resistance and secondary output voltage with ohmmeter
- Check TCI ignition unit by substituting known-good unit or using Yamaha diagnostic tester
- Test alternator stator winding resistance and check AC output at cranking RPM
- Verify rectifier regulator function by measuring DC charging voltage at battery terminals
- Clutch free play adjustment and check for clutch slip under acceleration
- Measure brake disc thickness variation and verify caliper piston movement
- Check fork seals by inspecting leg stanchions for oil weeping and measure fork oil level
- Verify shaft drive oil level and inspect final drive bevel gear for correct backlash
- Test starter clutch engagement by measuring cranking speed and listening for freewheeling noise
- Check steering head bearing play by pushing and pulling front fork with bike on centerstand
- Inspect electrical connectors for corrosion and clean ground connections at frame points
- Test all lighting circuits and verify horn and turn signal relay operation
ILLUSTRATIONS & DIAGRAMS INCLUDED:
- Complete inline-four engine exploded views with cylinder heads, DOHC camshafts, and valve train
- Cam chain routing diagram showing crankshaft sprocket, camshaft sprockets, tensioner guide route
- Carburetor assembly detail showing slide, needle jet, float bowl, and synchronizing port locations
- Clutch assembly cross-section showing friction plates, steel plates, basket, and center hub
- Transmission cutaway showing gear sets, shift drum, shift forks, and bearing locations
- Shaft drive final drive detail showing pinion gear, ring gear, bearing race, and oil seal arrangement
- Telescopic fork exploded view showing seal assembly, damper rod, bushings, and spring arrangement
- Front dual disc brake caliper cross-section with piston, pad, and bleed valve detail
- Rear disc brake caliper assembly showing single-piston design and pad retaining clips
- Alternator stator and rotor assembly showing winding connections and rectifier regulator detail
- TCI ignition system schematic showing pickup coil, spark units, and coil firing sequence
- Electrical wiring diagram with lighting circuits, ignition switch, and instrument panel connections
- Frame and swingarm assembly showing steering head bearing race installation and rear pivot points
- Exhaust system layout with header routing, collector, muffler mounting, and gasket locations
- Fuel tank and petcock assembly with vacuum line routing and fuel filter detail
COMPATIBILITY:
- Coverage: Yamaha XJ550 and XJ 550 RH models from model year 1981
- Engine coverage: 550 cc DOHC inline-four, air-cooled with four carburetors
- Transmission coverage: Five-speed constant mesh with shaft final drive
- File format: High-resolution searchable PDF with bookmarked sections
- Device compatibility: Windows, macOS, Linux, tablets, and smartphones
- Software requirement: Adobe Reader or any standard PDF viewer
FILE PROPERTIES:
- Format: Searchable PDF with full text indexing and bookmarked chapters
- Language: English
- Delivery: Instant digital download upon payment completion
- Access: Download available anytime after purchase through your account
- All pages fully printable in full resolution for workshop reference
1981 Yamaha XJ Models XJ550 550 RH 81 Service Repair Workshop Manual PDF
VEHICLE/EQUIPMENT INTRODUCTION:
The Yamaha XJ550, introduced for the 1981 model year, was part of Yamaha acclaimed XJ series of motorcycles that established the standard for Japanese inline-four street bikes in the late 1970s and early 1980s. The XJ lineage traced back to the groundbreaking 1979 XJ650, which featured a DOHC inline-four engine, cast aluminum frame, and shaft drive configuration. The XJ550 was developed as a mid-displacement variant aimed at riders seeking the smoothness and character advantages of an inline-four engine in a more manageable, middleweight package. The 550 cc displacement was strategically chosen for various international licensing and insurance markets that favored lower-displacement categories.
The XJ550 engine architecture featured a transverse mounted inline-four cylinder configuration with double overhead camshafts driven by a chain drive. This DOHC layout allowed efficient combustion chamber design with four valves per cylinder operated through rocker arms, a setup that provided excellent volumetric efficiency and smooth power delivery across a broad RPM range. The engine was fitted to a pressed-steel perimeter frame that provided adequate torsional rigidity for street riding, while the shaft final drive system eliminated the maintenance demands of chain drive and provided cleaner operation.
The XJ550 featured Yamaha Uni-Trak rear suspension in some variants, telescopic front forks, dual front disc brakes, and a single rear disc. The motorcycle was styled with the understated but attractive naked sport design that characterized the XJ range, featuring a round headlight, swept-back exhaust headers, and a comfortable riding position suitable for both commuting and touring. This manual provides the complete factory service and repair documentation for the 1981 Yamaha XJ550 and XJ 550 RH models.
SERVICE & REPAIR SCOPE:
- Complete inline-four engine overhaul including cylinder head, DOHC valve train, and cam chain service
- Piston and ring replacement, cylinder bore measurement, and hone procedure
- Connecting rod big-end bearing inspection, crankshaft runout measurement, and main bearing service
- Valve clearance inspection and adjustment using feeler gauge and shim selection
- Camshaft bearing clearance check and cam chain tensioner inspection
- Four-into-one exhaust system inspection, header pipe gasket replacement, and muffler repacking
- Carburetor synchronization for four Mikuni or BS-type carburetors, jet cleaning, and float level adjustment
- Clutch pack service: friction plate thickness measurement, steel plate flatness check, and clutch spring replacement
- Transmission overhaul: gear inspection, shift drum and fork service, and bearing replacement
- Shaft drive final drive overhaul: bevel gear lapping, pinion preload adjustment, and oil seal replacement
- Telescopic fork service: fork seal replacement, fork oil change, damper rod inspection, and spring rate check
- Rear shock absorber overhaul, preload adjustment, and damper rebuild
- Front dual disc brake caliper overhaul: piston seal replacement, pad fitting, and rotor warpage check
- Rear disc brake caliper service and brake disc thickness measurement
- Brake master cylinder rebuild and brake line bleed procedures
- Electrical system repair: alternator stator testing, rectifier regulator testing, ignition coil diagnosis
- Starter motor overhaul, starter clutch inspection, and solenoid service
- Battery charging system diagnostics and wiring harness continuity testing
- Steering head bearing adjustment, stem nut tightening, and bearing preload setting
TECHNICAL SPECIFICATIONS:
- Make: Yamaha
- Model: XJ550 (XJ 550 RH)
- Model year: 1981
- Engine type: Transverse inline-four cylinder, 4-stroke, air-cooled
- Valve train: DOHC, four valves per cylinder, chain-driven camshafts
- Bore and stroke: Approximately 56.5 mm x 43.8 mm (engine varies by variant)
- Displacement: 550 cc
- Compression ratio: Approximately 9.5:1
- Fuel system: Four individual carburetors (Mikuni BS type)
- Ignition: Transistor-controlled ignition (TCI)
- Transmission: Five-speed constant mesh
- Clutch: Wet multi-plate wet clutch
- Final drive: Shaft drive with bevel gear final reduction
- Frame: Steel pressed-steel perimeter/cradle
- Front suspension: Telescopic fork
- Rear suspension: Swingarm with dual shock absorbers or single shock (variant dependent)
- Front brakes: Dual disc
- Rear brake: Single disc
- Wheelbase: Approximately 1465 mm
- Seat height: Approximately 780 mm
DIAGNOSTIC INFORMATION:
- Perform compression test on all four cylinders and compare readings for acceptable consistency
- Set valve clearances to factory specification using feeler gauge at TDC compression stroke
- Check cam chain tensioner operation and listen for timing chain rattle at idle
- Sync all four carburetors using vacuum gauge bars and check idle mixture
- Test ignition coil primary resistance and secondary output voltage with ohmmeter
- Check TCI ignition unit by substituting known-good unit or using Yamaha diagnostic tester
- Test alternator stator winding resistance and check AC output at cranking RPM
- Verify rectifier regulator function by measuring DC charging voltage at battery terminals
- Clutch free play adjustment and check for clutch slip under acceleration
- Measure brake disc thickness variation and verify caliper piston movement
- Check fork seals by inspecting leg stanchions for oil weeping and measure fork oil level
- Verify shaft drive oil level and inspect final drive bevel gear for correct backlash
- Test starter clutch engagement by measuring cranking speed and listening for freewheeling noise
- Check steering head bearing play by pushing and pulling front fork with bike on centerstand
- Inspect electrical connectors for corrosion and clean ground connections at frame points
- Test all lighting circuits and verify horn and turn signal relay operation
ILLUSTRATIONS & DIAGRAMS INCLUDED:
- Complete inline-four engine exploded views with cylinder heads, DOHC camshafts, and valve train
- Cam chain routing diagram showing crankshaft sprocket, camshaft sprockets, tensioner guide route
- Carburetor assembly detail showing slide, needle jet, float bowl, and synchronizing port locations
- Clutch assembly cross-section showing friction plates, steel plates, basket, and center hub
- Transmission cutaway showing gear sets, shift drum, shift forks, and bearing locations
- Shaft drive final drive detail showing pinion gear, ring gear, bearing race, and oil seal arrangement
- Telescopic fork exploded view showing seal assembly, damper rod, bushings, and spring arrangement
- Front dual disc brake caliper cross-section with piston, pad, and bleed valve detail
- Rear disc brake caliper assembly showing single-piston design and pad retaining clips
- Alternator stator and rotor assembly showing winding connections and rectifier regulator detail
- TCI ignition system schematic showing pickup coil, spark units, and coil firing sequence
- Electrical wiring diagram with lighting circuits, ignition switch, and instrument panel connections
- Frame and swingarm assembly showing steering head bearing race installation and rear pivot points
- Exhaust system layout with header routing, collector, muffler mounting, and gasket locations
- Fuel tank and petcock assembly with vacuum line routing and fuel filter detail
COMPATIBILITY:
- Coverage: Yamaha XJ550 and XJ 550 RH models from model year 1981
- Engine coverage: 550 cc DOHC inline-four, air-cooled with four carburetors
- Transmission coverage: Five-speed constant mesh with shaft final drive
- File format: High-resolution searchable PDF with bookmarked sections
- Device compatibility: Windows, macOS, Linux, tablets, and smartphones
- Software requirement: Adobe Reader or any standard PDF viewer
FILE PROPERTIES:
- Format: Searchable PDF with full text indexing and bookmarked chapters
- Language: English
- Delivery: Instant digital download upon payment completion
- Access: Download available anytime after purchase through your account
- All pages fully printable in full resolution for workshop reference
