Honda CRF150R / CRF150RB Service Manual (2007–2009)

Honda service manual for the 2007–2009 CRF150R and CRF150RB, covering factory maintenance, diagnosis and repair for the standard and big-wheel configurations.

PDF Search, Chapter Access and Page Count

Search and diagram detail: An embedded OCR text layer supports searches across the service chapters, although recognition errors can prevent matches, particularly in tables and diagram labels. PDF bookmarks link to the contents and all numbered sections. Small wiring color codes are readable when enlarged.

Supplied as one printable, English-language, 328-page PDF, including one cover page, one blank page and eight memo pages.

Engine Rebuilding, Carburetor Tuning and Chassis Service

These selected coverage highlights outline the main workshop areas. Further topics include muffler packing replacement and drive-chain wear inspection.

• Engine repair: Step-by-step procedures for cylinder-head disassembly, valve-guide replacement, valve-seat refacing, piston replacement, camshaft installation and valve-clearance adjustment.

• Clutch and transmission: Multi-plate clutch inspection, kickstarter and gearshift-linkage service, crankcase separation, transmission assembly and crankshaft bearing replacement.

• Fuel system: Carburetor disassembly and assembly, accelerator-pump inspection, float-level checks, pilot-screw adjustment and temperature- and altitude-based jetting.

• Cooling and lubrication: Radiator pressure testing, coolant replacement and air bleeding, water-pump seal replacement, oil-pump inspection and pressure-relief-valve service.

• Suspension and brakes: Telescopic fork overhaul, rear shock rebuilding, Pro-Link linkage service, steering-stem bearing replacement, hydraulic brake bleeding and caliper repair.

• Electrical diagnosis: No-spark troubleshooting, ignition-coil and exciter-coil tests, ignition pulse generator checks, throttle position sensor inspection and wiring diagrams.

This manual suits readers already comfortable with engine disassembly and precision measurement, with access to the special tools and test equipment specified for the work.

Engine Inspection and Reassembly

Top-end work: The cylinder-head chapter connects compression testing with valve, guide, spring and camshaft inspection. Shim-selection calculations and cam-timing illustrations support reassembly, while standard dimensions and service limits distinguish adjustment work from worn-component replacement.

Bottom-end access: The manual separates jobs possible with the engine in the frame from those requiring removal. Crankshaft, transmission and oil-pump service require engine removal and crankcase separation; these distinctions help plan the teardown and required equipment.

Assembly drawings identify internal components, including the transmission shafts and balancer gears. The clutch section also explains how transmission-oil condition and additives can affect clutch operation.

The manual warns that backward oil-filter installation can cause severe engine damage. It also identifies camshaft positioning that can damage the intake lifter bores during removal or installation.

Carburetor Settings and Fuel-System Diagnosis

The Tuning Information Chart relates temperature and altitude to jet selection, needle-clip position and pilot-screw settings. Separate guidance addresses track conditions, with troubleshooting for rich or lean running, hesitation and hard starting.

Throttle position sensor replacement includes a resistance-based adjustment procedure. Float inspection uses a specified carburetor float-level gauge, and the exploded carburetor view shows the relationship between the jets, throttle valve and accelerator-pump components.

Cooling and Oil-Circuit References

The Cooling System Flow Pattern, Coolant Gravity Chart and Lubrication System Diagram support coolant testing and oil-circuit inspection. Water-pump coverage distinguishes coolant leakage from oil leakage at the telltale hole and identifies the impeller’s left-hand threads.

The lubrication chapter documents rotor-clearance inspection and explains which strainer and relief-valve work can be performed without removing the engine.

Suspension Overhaul and Brake Hydraulics

Fork procedures cover seals, bushings, damper inspection and oil-level adjustment, with separate settings for the two models. Rear shock coverage extends to the bladder, damper rod, piston ring, bleeding and nitrogen charging.

For detailed preload and damping setup to suit riding conditions and rider skill, the service manual refers to the separate Owner’s Manual. The rear shock contains pressurized nitrogen; its service instructions include pressure-release precautions before disassembly.

Brake chapters cover both master cylinders and calipers, with piston and bore inspection limits, seal replacement, disc checks and bleeding procedures.

Ignition Tests and Fault Isolation

The electrical chapter provides resistance and peak-voltage tests with connector references. Comparing readings at the ignition control module and component connectors helps distinguish wiring faults from component faults.

Cable & Harness Routing drawings and the Wiring Diagram support those checks. Separate troubleshooting charts address starting problems, power loss and poor performance at different engine speeds. Ignition timing is checked rather than adjusted because the ignition control module is factory preset.

Valve Clearance, Coolant and Torque Examples

For both models, intake valve clearance is specified as 0.16 ± 0.03 mm with the engine cold, below 35°C/95°F. The coolant-replacement section lists a system capacity of 0.76 liter.

Cylinder-head installation specifies a final nut torque of 31 N·m within a staged tightening procedure, with engine oil on the threads and seating surfaces. Other torque references include 88 N·m for the rear axle nut and 64 N·m for the flywheel nut, the latter with oiled threads and seating surface.