Yamaha YZ250F(A) 2011 Owner's Service Manual (P/N 17D-28199-31-E0)

Yamaha’s 2011 YZ250F(A) Owner’s Service Manual, P/N 17D-28199-31-E0, covers the USA, Canadian, European, Australian, New Zealand and South African market versions. It combines operating information and race-use maintenance with engine, chassis and electrical repair procedures.

Text Search, Chapter Bookmarks and Wiring Detail

Search and diagram access: Searchable PDF text and embedded bookmarks provide access to all seven chapters and their component sections. Small wiring labels are clearly readable when enlarged; the inside-cover notice has no searchable text.

One printable PDF contains 191 pages, including the front cover, inside-cover notice and five introductory and contents pages.

Engine Teardown, Chassis Service and Race Tuning

These coverage highlights sample the manual’s contents, which also include break-in procedures and silencer-fiber replacement.

• Engine and valve timing: Step-by-step procedures cover engine removal, cylinder-head and piston service, camshaft installation, crankcase separation, crankshaft inspection and balancer-shaft service.

• Clutch and transmission: Clutch disassembly and inspection, kick-shaft and shift-shaft service, shift-cam and shift-fork inspection, transmission reassembly and operation checks.

• Carburetor service: Keihin FCR-MX37 removal, disassembly, float-height inspection, accelerator-pump checks and timing adjustment, with jetting references for race tuning.

• Cooling and lubrication: Radiator and cooling-system pressure checks, water-pump shaft and seal replacement, oil-pump clearance inspection, and oil-filter and strainer servicing.

• Brakes and chassis: Hydraulic brake bleeding, caliper and master-cylinder repair, wheel-bearing replacement, steering-stem service, and swingarm-linkage bearing inspection and installation.

• Suspension: Front-fork disassembly and reassembly, rear-shock spring and mounting-bearing service, damping adjustments, and front-fork and rear-shock setting charts.

• Ignition and throttle position sensor: Wiring diagrams, ignition troubleshooting charts, CDI-magneto removal, coil and switch tests, and throttle position sensor replacement and adjustment.

The engine, chassis and electrical chapters are written for readers with basic Yamaha servicing knowledge and skills, such as Yamaha dealers and service engineers.

Component Inspection and Maintenance

Exploded-view diagrams pair with sequential job instruction charts, keeping the parts-removal order and related notes together at the workbench. Lubrication diagrams and cable routing diagrams provide references for restoring oil paths, hoses and electrical leads during reassembly.

Race-use maintenance schedules sit alongside valve-stem and clutch-plate wear limits, plus timing-chain and sprocket inspection criteria. Component-specific torque tables and tightening sequences support both routine maintenance and internal engine work.

Valve service: Shim-under-bucket valve adjustment includes separate intake and exhaust pad selection tables. The titanium-valve instructions require valves used for seat lapping to be replaced rather than returned to service.

Camshaft instructions flag the risk of damaging the cylinder head, caps and camshafts through uneven cap tightening. Bottom-end procedures include crankshaft runout and connecting-rod clearance checks, with special-tool references such as crankcase separator YU-1135-A / 90890-01135.

Carburetor Tuning and Electrical Diagnosis

The guide breaks down the Keihin FCR-MX37 carburetor, including needle-jet inspection and regional jet-needle, pilot-jet and leak-jet settings. Main-jet and needle-selection charts relate tuning choices to throttle opening and running symptoms.

Starting guidance distinguishes cold and hot starts and addresses accelerator-pump fuel delivery and spark-plug fouling. The tuning chapter also explains how atmospheric conditions affect mixture settings.

Fault isolation: Ignition troubleshooting charts distinguish switch, ignition-coil and CDI-magneto checks before CDI-unit replacement. Throttle position sensor diagnosis adds variable-resistance and input-voltage tests, followed by replacement and output-voltage adjustment.

Brake Repair and Suspension Service Limits

Brake sections include internal caliper and master-cylinder inspection, seal replacement, hose routing and postassembly leak checks. Steering-stem and swingarm-linkage procedures add bearing replacement details, installation-depth data and lubrication points.

Front-fork procedures extend to damper bleeding, oil-seal replacement and reassembly checks; Yamaha recommends dealer maintenance for this assembly. Suspension setting charts connect handling symptoms with spring, damping and fork-oil adjustments.

Rear-shock scope: Coverage includes removal, inspection, spring replacement, mounting-bearing service and external adjustment. The manual expressly prohibits disassembly of the nitrogen-charged cylinder or reservoir; it does not provide an internal damper rebuild procedure.

Always review the included safety precautions and factory warnings before brake or suspension work.

A Preview of Cooling, Valve and Tire Specifications

Cooling-system capacity is 1.00 L, including all coolant routes. The valve-adjustment section specifies a cold intake-valve clearance of 0.12–0.17 mm, alongside separate exhaust-valve specifications and adjustment references.

Standard front and rear tire pressure is 100 kPa, checked cold. The chassis-tuning section also gives condition-specific pressure adjustments for muddy, sandy, stony and hard tracks.