1997 Aprilia Pegaso 650 Service & Repair Manual (P/N 942V)

This Aprilia service and repair manual covers the 1997 Pegaso 650 in standard and catalytic versions, with UK, Austrian, and Swiss specifications. Manual code 942V, first edition March 1997.

• Engine and lubrication: Engine removal and installation, selected external component removal, dry-sump oil and filter service, and oil-delivery pump bleeding.
• Fuel system: Mikuni BST 33 carburetor removal, disassembly, component inspection, throttle-valve alignment, and reinstallation, plus fuel-cock and fuel-level sender service.
• Cooling system: Radiator, cooling electrofan, thermal switch, thermistor, and expansion-tank removal, with electrical checks for temperature indication and fan operation.
• Electrical diagnosis: Nippondenso C.D.I., ignition-coil, pick-up, alternator, voltage-regulator, battery, and lighting checks, plus starter-interlock testing.
• Chassis and brakes: Hydraulic brake bleeding, pad replacement, disc inspection, steering-bearing adjustment, fork rebuilding, wheel-bearing replacement, and rear-suspension linkage service.
• Workshop references: Periodic service and lubricant charts, tightening-torque tables, troubleshooting charts, exploded views, cable-routing drawings, and system wiring diagrams.

Written for professional mechanics, this manual assumes workshop knowledge and omits many basic explanations.

Engine Removal and Lubrication Service

The engine chapter covers removal from and reinstallation in the frame, including exhaust-pipe and drive-sprocket-cover removal. Internal engine overhaul requires the separate Engine Service Manual No. 933 (D-UK) or No. 934 (I-E-F); neither is included.

Oil-service instructions distinguish the engine filter from the frame-mounted filter and include delivery-pump bleeding after the lubrication circuit has been completely drained. Engine, clutch, and gearbox symptoms are addressed in troubleshooting tables.

Carburetor Identification and Repair

Carburetor identification BST 33 412 and separate Austrian/Swiss jet specifications help match the documented setup before choosing parts. An exploded carburetor view identifies the assemblies covered by the float, needle-valve, diaphragm, slide, and cold-start device procedures.

The manual warns that similar-looking components from the paired carburetors are not all interchangeable.

Cooling Components and Repair Limits

The cooling-system layout shows the radiator, expansion tank, hoses, and temperature-control components. Procedures cover coolant replacement and testing of the cooling fan, thermal switch, and temperature thermistor.

Thermostatic-valve operation is explained, but thermostat and water-pump repair is referred to the separate engine manual.

Ignition, Charging, and Starting Faults

The C.D.I.-connector test table separates wiring, ignition-coil, pick-up, and starter-safety checks, helping trace a no-spark fault before condemning the ignition unit. C.D.I. and regulator resistance tests are described as approximate, with comparison against a known-good unit recommended.

The complete Pegaso 650 wiring diagram is supported by separate ignition and starting-safety diagrams, operating-logic tables, and electrical component-location drawings.

Forks, Bearings, Brakes, and Rear Suspension

Chassis coverage extends to fork seals and bushings, steering and swingarm bearings, and shock-linkage disassembly. Both standard spring-preload adjustment and the optional hydraulic-preload arrangement are described. Brake and wheel sections provide wear limits, disc-runout checks, and tire-pressure data.

Overtightening the shock-absorber mounting screw can damage its threaded mounting point and require replacement of the complete shock absorber. Verify the lift setup and follow the manual's support and two-person handling precautions for engine and chassis removal.

A Preview of Oil and Exhaust-Fastener Specifications

These are two examples from the manual's service specifications.

The lubricant chart lists IP SUPERBIKE 4 SAE 5W-40 engine oil and defines performance requirements for alternatives.

For the exhaust-manifold nuts at the cylinder head, the service section specifies 25 Nm with the engine cooled to room temperature. Component torque values also appear alongside the relevant removal and installation procedures.

PDF Navigation and File Contents

Search and diagram detail: Most body text is searchable, and embedded bookmarks link to English sections across all eight chapters. Some headings and wiring labels are not searchable; small wiring labels require zooming. PDF p. 42 renders blank, and the brake-disc illustration on PDF p. 244 is damaged.

One printable 311-page PDF contains English, Italian, and Spanish text. The total includes one cover, nine note pages, and the blank page; no additional PDF files are included.