2008 Can-Am DS 450 EFI / DS 450 EFI X Shop Manual (P/N 219 100 264)

• BRP Technical Publications Shop Manual P/N 219 100 264, copyright 2007, for the 2008 Can-Am DS 450 EFI and DS 450 EFI X
• 383-page PDF file covering maintenance, troubleshooting, engine repair, EFI and engine management, electrical systems, drive system, chassis, technical specifications, and wiring-diagram identification material
• Covers the ROTAX 449, a 449.3 cc liquid-cooled DOHC four-stroke with dry-sump two-pump lubrication, wet multi-plate clutch, integrated five-speed constant-mesh gearbox, and chain-driven solid rear axle
• Coverage is defined by the 2008 DS 450/DS 450 X model designation. The manual identifies VIN, model-number, and engine-serial-number locations for ECM replacement work, but does not provide serial-number break tables

Technical Coverage and Diagnostics

This factory manual goes well beyond routine maintenance. Engine repair coverage includes removal and installation, cylinder head and cylinder work, camshaft and timing-chain service, valve shim adjustment, piston and ring inspection, crankcase splitting, crankshaft and balancer-shaft work, clutch repair, and internal gearbox inspection. The lubrication section breaks the dry-sump system down into the pressure pump, suction pump, pressure regulator, oil tank strainer, internal engine strainer, oil nozzle, and oil tube. Cooling-system procedures extend through radiator and fan diagnosis, thermostat testing, water-pump shaft, bearing, and seal replacement.

The electronic side is equally specific. The engine management section covers the ECM, Controller Area Network (CAN), B.U.D.S. diagnostics, MPI-2 interface, monitoring system, and fault-code tables. EFI repair and testing includes the Dell'Orto 46 mm single throttle body, Bosch in-tank pump, fuel injector and rail, TPS, IACV, CPS, MAPS, AAPTS, and CTS. Factory procedures include fuel-pressure diagnosis, injector activation, cooling-fan activation, ECM replacement data entry, fault-code clearing, and the Closed Throttle and Idle Actuator reset required after work involving the TPS, throttle body, IACV, or ECM.

Electrical diagnosis covers ignition, charging, starting, lighting, relays, grounds, connectors, and stator testing rather than simply listing component locations. Named visual references include the Fuel System Diagnostic Flow Chart, Engine Removal and Installation exploded view, Oil Pump - Axial Clearance Measurement, Stator Output Voltage Test at Voltage Regulator/Rectifier Connector, Correct Position of the Piston Circlip, and the Connector Location Area / Terminal Location in Connector key.

File-scope note: the BRP publication references a wiring diagram on the last page. In this supplied PDF, the file ends with the wiring-diagram legend explaining wire colors, connector areas, connector identification, and terminal locations; the separate full schematic/foldout referenced by that page is not present. Electrical test procedures and pin/circuit references throughout the manual remain included.

Several repair-specific cautions show the level of detail in the procedures. Pistons marked "1" must be matched to "A" cylinders and pistons marked "2" to "B" cylinders; the manual warns that mismatching them can cause serious engine damage. During crankcase assembly, the connecting rod must be kept clear of the oil spray nozzle or it can crush the nozzle. On the cooling fan, the long mounting screw belongs in the LH upper location because installing it elsewhere can damage the radiator fins.

Specifications and Maintenance Data

Factory data is given throughout the procedures and again in the technical-specification section. The ROTAX 449 uses 1.8 L (1.9 qt) of engine/transmission oil for an oil change with filter. The oil-pressure test specifies a warm engine with at least 80°C (176°F) oil temperature and minimum pressure of 80 kPa (12 PSI) at idle and 200 kPa (29 PSI) at 5000 RPM. Cooling-system capacity is 1.8 L (1.9 qt), with a 110 kPa (16 PSI) system/cap test pressure. Fuel-pump operating pressure is 350 kPa (51 PSI), while ECM-controlled idle speed is 1850 ± 50 RPM and is not adjustable. The fuel tank holds 11.5 L (3.0 U.S. gal).

Chassis data includes the 14/42 rear-drive ratio, Regina 135 ORC6 drive chain, steering alignment specifications, suspension settings, brake wear limits, DOT 4 brake-fluid data, tire pressures, dimensions, and load figures. The specification table also distinguishes the DS 450 X where hardware differs; for example, its front HPG shock absorbers are identified as fully adjustable.

One factory-data inconsistency is worth knowing before using the numbers for valve work. The detailed cold-engine valve-clearance procedure states 0.11-0.19 mm intake and 0.22-0.30 mm exhaust, while the final technical-specification table prints 0.11-0.18 mm intake and 0.22-0.29 mm exhaust. Both values are present in the publication rather than being silently reconciled here. Other engine limits include a 0.090 mm piston-to-cylinder clearance service limit, 165.2 mm timing-chain service limit measured across 21 pins, 0.06 mm camshaft radial-clearance limit, and 0.65-0.90 mm nominal decompressor valve lift.

Special-tool references are tied directly to factory procedures. Examples include MPI-2 P/N 529 036 018 with diagnostic cable P/N 710 000 851, engine leak-down test kit P/N 529 035 661, crankshaft locking tool P/N 529 036 107, camshaft timing device P/N 529 036 084, and water-pump seal installer P/N 529 036 077. The oil-pressure test also specifies the BRP timing-chain-tensioner adapter, adapter hose, and pressure gauge rather than leaving the test setup generic.

Maintenance material covers the scheduled service chart, preseason preparation, storage, and special procedures after rollover or ATV immersion. Preseason preparation specifically references the 100-hour / 5000 km (3100 mi) / 1-year maintenance column, while coolant concentration is checked yearly or every 50 hours / 2500 km (1600 mi). Fuel-pressure work, cooling-system pressure testing, battery and starter diagnostics, brake service, and internal engine repair should be performed with the ATV secured and the affected system isolated or depressurized as specified in the manual.