2000 Bombardier DS 650 ATV Shop Manual (P/N 7404)

• This 172-page factory shop manual PDF covers the Bombardier-made 2000 DS 650, model 7404. It includes vehicle and engine serial-number locations, VIN construction, and the factory's 12-section service layout.
• Bombardier-Rotax 654 engine repair spans engine removal and installation, cylinder-head and camshaft work, valve and centrifugal-decompressor service, piston and cylinder inspection, crankshaft/balancer-shaft teardown and recentering, and lubrication-system pressure diagnosis.
• Clutch and transmission procedures address the pressure plate, friction and steel plates, clutch basket and release shaft, five-speed constant-mesh transmission, shift mechanism, shaft inspection, bearing replacement, reassembly, and final gear-change checks.
• Fuel and cooling coverage details Mikuni BSR42 carburetor cleaning and adjustment, fuel-system pressurization, radiator and cap checks, coolant draining and refilling, thermostat testing, and water-pump and seal service.
• Electrical fault finding covers the three-phase magneto, regulator/rectifier and stator tests, starting-system troubleshooting, CDI trigger/coil/module checks, Packard and Deutsch connector service, accessory tests, connector-pin views, and the full wiring diagram.
• Chassis and brake repair includes the chain, sprockets, eccentric axle housing, rear axle, hubs and bearings, steering and toe adjustment, A-arms and ball joints, shocks and swing arm, hydraulic master cylinders and calipers, brake bleeding, body panels, and frame inspection.

Coverage is specific to the 2000 DS 650 model 7404, rather than a generic multi-year DS 650-series manual. Because its repair procedures assume a hoist, pullers and installers, pressure-testing equipment, a multimeter, and precision measuring tools, it is best suited to professional technicians and experienced DIY owners with a properly equipped workshop.

Engine and Drivetrain Repair

The engine chapters go well beyond routine service. They document cam timing, four bucket-tappet valves, the automatic centrifugal decompressor, valve-seat and guide inspection, piston-ring orientation, cylinder measurement, balancer timing, crankshaft deflection, and crankshaft end-float spacer selection. The dry-sump lubrication chapter adds oil-pressure troubleshooting, pressure and return pump inspection, regulator and strainer service, plus oil-circuit bleeding after engine installation.

Special-tool listings identify the magneto puller P/N 420 976 235, crankshaft locking bolt P/N 529 035 617, clutch basket holder P/N 529 035 618, and ball-joint remover P/N 529 035 639, among other factory tools. Clutch work can be performed without removing the engine, while transmission and crankshaft work require engine removal and crankcase separation. The manual also flags a specific clutch trap: pulling the release lever backward with the engine hot can dislodge the pressure-plate bearing.

Diagnostics, Diagrams, and Chassis Work

Fuel-system service covers tank and valve inspection, a pressure-decay leak test, carburetor float-level setup, pilot and idle adjustment, throttle-cable adjustment, and intake-system inspection. The carburetor chapter warns that unapproved jet substitutions or poor alignment at the carburetor adapter can alter calibration and cause severe engine damage.

Electrical diagnosis follows the charging, starting, and CDI ignition circuits through continuity, resistance, voltage, and dynamic tests. It also explains the system's unusual ground-side switching logic. Visual references include the cylinder-and-head and crankshaft/balancer-shaft exploded views, clutch assembly view, hydraulic-brake layouts, major connector-pin identification chart, and full vehicle wiring diagram. One important limit is stated directly: ignition timing cannot be checked with a timing light because there is no access window or timing mark.

Maintenance, Specifications, and Workshop Limits

The maintenance chart separates pre-ride, initial, hour-based, annual, and two-year work. Storage and pre-season procedures cover fuel stabilization, internal engine protection, intake and exhaust blocking, battery care, cleaning, and return-to-service checks. Reference tables provide component-specific torque specifications, general 8.8-grade metric fastener values, approved fluids and capacities, wear limits, clearances, adjustment data, and electrical test specifications.

Chassis sections cover chain adjustment and matched chain/sprocket replacement, axle and hub service, ball-joint installation, wheel alignment, hydraulic brake overhaul, and frame welding precautions. Rear-shock coverage includes spring removal, inspection, and nitrogen-reservoir pressure adjustment, but not a full internal damper rebuild. Fuel-system pressurization, brake repair, and nitrogen-charged shock work carry fire, braking, and high-pressure hazards; the factory precautions and specified equipment should be followed, and critical work should be handled by a qualified technician when the required tools or experience are unavailable.