2007–2008 Honda CRF450R Service Manual (P/N 07SM2-MBN)

• Comprehensive coverage of 2007–2008 Honda CRF450R high-performance motocross motorcycles, detailing engine, drivetrain, suspension, and chassis service for both base 2007 and post-2007 variants.
• Original OEM publication (PN 07SM2-MBN-2007, form number 61MEN01) provided as a searchable PDF.
• 394 pages featuring essential wiring diagrams, technical specification tables, and torque value charts.
• Covers essential maintenance for the water pump, balancer shaft, gearshift linkage, hydraulic brakes, steering head bearings, telescopic fork, shock absorber, and Pro-Link rear suspension.
• Features clear visual aids including cable routing drawings, lubrication system diagrams, HPSD characteristics charts, carburetor exploded views, component location views, suspension assembly drawings, and ignition peak voltage tables.

Manual Content and Chapter Breakdown

This official Honda service documentation delivers organized, system-by-system mechanical data. It starts with core general information like model-specific serial numbers and baseline service rules. From there, you dive into the internal engine systems. The guide provides detailed breakdowns of lubrication and fuel delivery. It also includes a dedicated technical feature segment exploring the auto-decompression mechanism and the Honda Progressive Steering Damper (HPSD) introduced on post-2007 models.

Subsequent sections cover the chassis. You will find procedural references for the removal and installation of frame components, exhaust systems, and body panels. It provides highly structured reference data for the cylinder head, valves, piston assemblies, clutch, kickstarter, and transmission. Electrical sections map out wiring diagrams and sensor reference values to speed up diagnostic work. Finally, consolidated fault isolation sections for both chassis and engine help identify complex running issues fast. By utilizing the provided step-by-step instructions for tasks like rebuilding the front forks, adjusting valve clearances with shims, overhauling the FCR carburetor, and recharging the rear shock absorber with nitrogen, you can keep these machines on the track and complete the repair without outsourcing the labor to an expensive dealership.

Specification and Technical Data Preview

Having exact technical data on hand streamlines your daily workflow in the bay. Access to direct factory parameters ensures that every engine rebuild or suspension setup matches precise Honda tolerances, severely reducing diagnostic time and preventing broken aluminum fasteners. Standard and service limit values are laid out in segmented tables for rapid reference during any repair. The manual lists critical measurements including valve clearance, cylinder compression, and oil pump tolerances. Tightening torque specifications are provided for every fastener across the engine and frame. This includes primary drive gear nuts, cylinder head bolts, and suspension linkage pins.

• Cylinder compression is specified at 539 kPa (5.5 kgf/cm², 78 psi) at 600 rpm.
• Intake valve clearance measures precisely 0.16 ± 0.03 mm.
• Coolant system capacity requires 1.03 liters during a fluid change.

Due to the high-performance nature of these motocross bikes, proper safety protocols are crucial. Always verify your workspace setup and ensure standard shop safety practices are followed before undertaking heavy maintenance. If specialized diagnostic equipment is unavailable, consulting a certified technician is strongly advised prior to altering factory engine or suspension settings.