Can-Am DS 450 EFI / EFI X — 2008 ATV 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.

PDF Search, Navigation and Page Count

Text search and diagram detail: An embedded OCR text layer supports searches across the main technical sections, although recognition errors can affect individual words and labels. There are no embedded PDF bookmarks. Small connector labels and diagnostic-chart text are readable when enlarged in the reviewed examples.

One printable English PDF contains 384 pages, including the cover, title and copyright pages, seven contents pages, and 21 blank reverse sides.

Engine Overhaul, EFI Diagnosis and Chassis Service

These are selected coverage highlights, rather than a complete contents list. Other examples include air-filter housing service and spark-arrester cleaning.

• Engine repair: Engine removal, cylinder-head and cylinder work, valve-shim adjustment, piston inspection, crankcase separation, and crankshaft and balancer-shaft service.

• Clutch and gearbox: Wet multi-plate clutch repair, cable and release adjustment, shifting-mechanism inspection, and internal gearbox disassembly and reassembly.

• Lubrication and cooling: Oil-pressure diagnosis, pressure and suction pump inspection, cooling-system leak tests, thermostat testing, and water-pump shaft, bearing and seal replacement.

• EFI and engine management: B.U.D.S. diagnosis, fault-code tables, ECM replacement, injector testing, sensor checks, and Closed Throttle and Idle Actuator reset procedures.

• Electrical troubleshooting: Ignition, charging, starting and lighting diagnosis, with stator tests, relay checks, ground-circuit tests and connector illustrations.

• Rear drive: Drive-chain adjustment and wear inspection, sprocket replacement, solid rear-axle service, and chain-tensioner bearing and seal work.

• Brakes and chassis: Brake bleeding, caliper and master-cylinder service, wheel bearings, steering alignment, suspension adjustments, and swing-arm and linkage repair.

Suited to experienced ATV technicians familiar with internal engine repair and electrical testing; the B.U.D.S.-dependent procedures require compatible diagnostic equipment.

Engine, Valve Train and Transmission

The ROTAX 449 is a 449.3 cc liquid-cooled DOHC four-stroke. Step-by-step instructions distinguish camshaft timing after top-end work from timing setup following a complete engine teardown.

Cylinder leak-down testing and interpretation support engine fault diagnosis before disassembly. The repair sections extend to valve seats and guides, piston rings, crankshaft bearings and gearbox shift forks, with component-specific inspection limits.

Tool references include leak-down kit P/N 529 035 661, crankshaft locking tool P/N 529 036 107 and camshaft timing device P/N 529 036 084. Illustrations include the Engine Removal and Installation exploded view and Correct Position of the Piston Circlip.

Component matching: The manual warns that mismatching piston grades “1” and “2” with cylinder grades “A” and “B” can damage the engine, and that the connecting rod can crush the oil spray nozzle during crankcase assembly.

Valve-clearance discrepancy: The cold-engine inspection procedure and final technical-specification table print different clearance ranges; both are present in the publication (PDF p. 95 and PDF p. 375).

The X package has a quick clutch-cable adjuster without the locknut used by the other adjuster type. Internal gearbox coverage includes gear engagement, shaft journals, bearings and shift-fork wear.

Dry-Sump Lubrication and Cooling

The two-pump dry-sump system lubricates the engine and transmission together. Coverage extends through the pressure regulator, oil-tank strainer, internal engine strainer, oil nozzle and oil tube. The Oil Pump - Axial Clearance Measurement illustration supports pump inspection.

The oil-pressure procedure identifies the timing-chain-tensioner adapter, adapter hose and pressure gauge needed for its test setup. Cooling coverage includes radiator and fan diagnosis, cap testing, coolant replacement and concentration checks.

Water-pump seal work references installer P/N 529 036 077. The cooling-fan instructions also warn that incorrect mounting-screw placement can damage radiator fins.

EFI, B.U.D.S. and ECM Replacement

The engine-management material explains the ECM, Controller Area Network (CAN), monitoring functions and fault-code diagnosis. Communication-tool instructions identify MPI-2 P/N 529 036 018 and diagnostic cable P/N 710 000 851.

EFI testing covers the Dell’Orto 46 mm single throttle body, Bosch in-tank pump, injector and fuel rail. Individual procedures address the TPS, IACV, CPS, MAPS, AAPTS and CTS.

The Fuel System Diagnostic Flow Chart links pump operation and pressure behavior to further checks. Together with the pressure-test section, it helps distinguish electrical pump faults from pressure-regulation and leakage problems before components are selected