Honda CRF450R 2005–2006 Service Manual (PDF)

Honda factory service manual for the 2005–2006 CRF450R, covering scheduled maintenance, fault diagnosis, component inspection, and repair.

PDF Search, Chapter Bookmarks and Wiring Detail

Search and diagram access: An OCR text layer supports searches throughout the service chapters, although recognition is incomplete in some tables and small diagram labels. Embedded chapter bookmarks provide access to the service sections and index. Small wire-color codes and connector labels on the Wiring Diagram are legible when enlarged.

Supplied as one printable, English-language, 355-page PDF, including the cover, three introductory pages, and seven memo pages within that total.

Engine Rebuilds, Suspension Service and Ignition Diagnosis

The following selected repair topics outline the manual’s coverage rather than reproduce its full contents. Further examples include muffler packing replacement and wheel spoke lacing.

• Engine and valve train: Compression testing, valve-clearance and decompressor adjustment, camshaft and cam-chain service, cylinder-head repair, and cylinder/piston inspection.

• Clutch and transmission: Clutch repair, kickstarter and gearshift-linkage service, crankcase separation, transmission disassembly and assembly, crankshaft inspection, and balancer timing.

• FCR carburetor: Removal, disassembly, reassembly, float-level measurement, accelerator-pump inspection, pilot-screw adjustment, and throttle-position-sensor replacement.

• Cooling and lubrication: Radiator-cap and system-pressure tests, coolant replacement and air bleeding, water-pump seal replacement, oil-strainer inspection, and oil-pump service.

• Suspension and steering: Fork rebuilding and damper bleeding, rear-shock service and nitrogen charging, linkage and swingarm bearing replacement, and steering-stem service.

• Hydraulic brakes: Fluid replacement and air bleeding, pad and disc inspection, and front/rear master-cylinder and caliper overhaul.

• Electrical diagnosis: ICM troubleshooting, ignition-coil tests, exciter-coil and ignition-pulse-generator peak-voltage checks, engine-stop-button testing, TPS inspection, and the Wiring Diagram.

Honda states that this manual is intended for qualified professional technicians with the training, tools, and equipment required for the work.

Engine Access and Internal Repair

Work planning: The manual distinguishes components that can be serviced in the frame from those requiring engine removal. Cylinder-head, piston, clutch, kickstarter, gearshift-linkage, carburetor, flywheel, water-pump, and balancer service can be performed with the engine installed; crankcase, crankshaft, transmission, and oil-pump work require removal. That distinction helps establish the scope of a repair before disassembly.

Step-by-step procedures extend to valve-guide replacement and valve-seat refacing. Internal-engine coverage includes crankshaft measurements, transmission gear and shift-fork inspection, crankcase bearing replacement, and assembly checks.

Maintenance schedules, exploded component views, torque tables, and service limits support the procedures. The Lubrication System Diagram identifies the oil path and related components. Tool references include valve spring compressor 07757-0010000 and clutch center holder 07724-0050002.

The cylinder-head section warns that lapping the titanium intake valves damages their thin oxide coating. Separate assembly cautions address severe engine damage from a reversed oil filter and the risk of serious damage from reused piston-pin clips.

FCR Calibration and Cooling-System Tests

Model-year differences: Carburetor identification changes from FCR00D for ’05 to FCR00E After ’05, with NGGQ versus NCYQ jet needles. Pilot-screw initial openings are 1-7/8 and 1-1/2 turns out, respectively. The Tuning Information Chart relates carburetor settings to temperature and altitude, with further guidance for special track and weather conditions.

The fuel-system chapter also describes TPS positioning after replacement. Cooling coverage combines the Coolant Gravity Chart with hydrometer testing, radiator-cap testing, system leak checks, and water-pump bearing, water-seal, and oil-seal replacement. Water-seal driver 07945-KA30000 is identified in the tool references.

Fork, Rear-Shock and Brake Overhaul

Fork service: The procedures cover seals and bushings, damper refilling and bleeding, oil-quantity adjustment, and installation checks. Standard fork-tube oil quantity changes from 382 cm³ for ’05 to 375 cm³ After ’05; fork-damper quantities change from 195 to 190 cm³.

Standard fork compression damping changes from 11 to 8 clicks out, while rebound changes from 7 to 9 clicks out, measured from fully seated. These are meaningful 2005/2006 differences when rebuilding or returning suspension to factory baseline. Fork-seal driver 07VMD-KZ30100 is referenced.

Rear-shock service: Coverage includes bladder replacement, damper-rod inspection, valve-stack handling, oil filling, and nitrogen charging. The manual notes that illustrated valve arrangements may differ from the actual assembly. Nitrogen pressure is 980 kPa (142 psi); shock-oil capacity changes from 385 to 395 cm³, and standard spring installed length from 256.3 to 256.7 mm.

Wheel-bearing replacement, linkage and swingarm bearing service, and steering-head bearing procedures extend the chassis coverage. Brake overhaul sections include piston and cylinder inspection limits alongside the hydraulic service procedures.

The rear shock is a high-pressure nitrogen unit, the cooling system is pressurized, and hydraulic-brake work uses DOT 4 fluid; the related precautions accompany those procedures. Honda refers readers to the Owner’s Manual for pre-ride inspection and detailed rider-specific suspension setup.

Ignition Fault Tracing and Test Equipment

The electrical chapter provides diagnostic checks beyond the wiring schematic. Comparing peak-voltage readings at the ICM and component connectors helps distinguish wiring faults from exciter-coil or ignition-pulse-generator faults.

Ignition timing is checked rather than adjusted because the ICM setting is factory preset. Cable & Harness Routing views distinguish ’05 and After ’05 layouts, and engine-mount torque specifications also retain the year split.

Equipment references include peak-voltage adaptor 07HGJ-0020100 outside the U.S. and the U.S.-only IgnitionMate tester MTP07-0286. Dedicated troubleshooting charts address hard starting, loss of power, poor low- or high-speed performance, and handling faults.

Examples of Valve, Carburetor and TPS Specifications

For cold-engine valve-clearance inspection below 35°C (95°F), the manual specifies 0.16 ± 0.03 mm intake and 0.28 ± 0.03 mm exhaust. The maintenance section links these measurements to shim selection and decompressor checks.

Carburetor references include an 8.0 mm float level and a warm-engine idle speed of 1,700 ± 100 rpm. Electrical inspection specifies 4–6 kΩ TPS resistance at 20°C (68°F), measured between the blue and black sensor terminals.