Suzuki RM125 2007 Owner's Service Manual (P/N 99011-36F56-03A)

Suzuki’s RM125 Owner’s Service Manual, P/N 99011-36F56-03A, covers operation, race maintenance, tuning and repair of the 2007 RM125 closed-course competition model.

PDF Search, Bookmarks and Page Details

Search and diagram detail: OCR text search is available across the main chapters, with recognition errors in some labels and identifiers. Embedded bookmarks cover the chapters and wiring diagram; the “Keyword Search” bookmark has no active destination. Small wiring labels are readable with zooming.

Supplied as one English-language, printable 252-page PDF. The total includes both covers, eight introductory/index pages, one blank page, six memo pages and the publication page.

Race Maintenance, Engine Repair and Chassis Service

These coverage highlights show selected contents rather than the complete contents list. Other topics include fuel-valve filter cleaning and exhaust-silencer packing replacement.

• Race maintenance: Pre-practice and pre-race inspections, break-in procedures, periodic maintenance charts, and lubrication schedules.

• Engine repair: Step-by-step instructions for engine removal, top-end work, exhaust valve and governor service, crankcase separation, and crankshaft inspection.

• Clutch and shifting: Clutch-plate and sleeve-hub inspection, release-camshaft service, kick starter repair, and transmission and gearshift mechanism inspection and reassembly.

• Fuel system: Mikuni TMX38SS carburetor disassembly, float adjustment, jetting selection, solenoid testing, throttle position sensor checks, and reed valve inspection.

• Cooling and ignition: Cooling-system pressure tests, radiator and water pump service, no-spark troubleshooting, peak-voltage checks, and ignition coil and stator resistance tests.

• Suspension and steering: Fork seal and bushing replacement, damper oil service, rear shock absorber disassembly and reassembly, linkage bearing replacement, and steering stem service.

• Wheels and brakes: Wheel bearing and brake disc inspection and replacement, caliper and master cylinder overhaul, brake fluid replacement, and bleeding procedures.

The internal repair sections suit mechanically experienced owners and technicians with suitable measuring equipment and special tools; rear shock service also requires gas-charging equipment.

Engine Inspection and Fault Diagnosis

Top-end coverage for the 124cc engine includes cylinder, piston and ring measurements, connecting-rod checks, and exhaust valve inspection. Bottom-end procedures extend to transmission removal, crankshaft installation, bearings and oil seals.

Special-tool references include crankcase separating tool 09920-13120 and crankshaft installer 09910-32812, helping you identify the equipment needed before planning internal engine work.

The troubleshooting tables connect starting, power-loss, overheating and clutch complaints with possible causes and remedies. Separate chassis tables address handling, suspension and braking symptoms, while the ignition section provides a dedicated no-spark or poor-spark diagnostic sequence.

Carburetor Tuning, Cooling and Electrical References

Factory jetting guidance explains how the pilot, needle, main and power-jet systems relate to throttle opening. Temperature, altitude and humidity graphs support assessing carburetor settings for changing race conditions.

Carburetor exploded views accompany the fuel-system procedures. Electrical circuit and wiring diagrams show the ignition, throttle position sensor and carburetor solenoid connections, while wire, cable and hose routing views support reassembly.

The cooling chapter includes radiator cap testing and water pump inspection. Its impeller uses left-hand threads, an important distinction when avoiding thread or shaft damage during service.

Suspension Tuning and Fork Service Limits

Compression and rebound damping guidance is supported by spring-selection tables, rear spring preload and sag checks, and front-to-rear suspension balance guidance. A setting-data sheet provides space to record track conditions and chassis adjustments.

Fork procedures include oil replacement, seal and bushing work, and damper bleeding. Internal disassembly of the damper rod assembly and compression damper unit is expressly prohibited. The fork section also warns that pushing the inner rod’s threaded end into the damper rod after removing its lock-nut can damage the inner rod oil seal.

Rear suspension coverage extends to shock absorber oil replacement, internal inspection, reassembly, swingarm service and linkage bearings. Shock servicing involves high-pressure nitrogen; follow the manual’s pressure-release warnings and equipment requirements. Brake fluid and coolant also require protective handling.

A Preview of Fork Oil and Coolant Specifications

With the standard fork spring, the outer-tube oil adjustment range is 314–408 ml per leg. The damper-rod filling procedure separately specifies 193 ml; these figures apply to separate chambers. Optional fork springs have their own oil-quantity tables.

The coolant section specifies a 50:50 mixture of aluminum-compatible antifreeze and distilled water. An engine coolant density–freezing point curve accompanies the guidance for colder conditions.