1990–2007 Yamaha Blaster YFS200 (U-A) ATV Service Manual Set (P/N LIT-11616-06-41)

The YFS200A supplement is intended to be used together with the base manual. It supplies revised identification, specifications, cable routing, transmission-oil checks, parking-brake adjustment and carburetor-setting information.

Text Search, Chapter Bookmarks and Diagram Detail

Finding procedures and reading wiring: An embedded OCR layer supports text searches across much of the file, but some pages have no searchable text. Bookmarks cover both publications; one lighting-troubleshooting bookmark points to the contents. Small wiring codes and connector labels are best read enlarged.

One printable English PDF contains 248 pages total: 234 base-manual pages, 12 supplement pages and two outer cover pages already included in the total. The base-manual count includes one blank chapter-end page and one memo page.

Engine Overhaul, Carburetion and Chassis Service

The following highlights are a selection of the workshop content. Other included topics include air-filter servicing and exhaust-system inspection.

• Engine overhaul: Step-by-step procedures for engine removal, crankcase separation, cylinder and piston inspection, crankshaft service, and reassembly, supported by exploded assembly views.

• Clutch and transmission: Clutch disassembly, plate and spring inspection, transmission-shaft checks, shift-fork examination, kick-starter service, and assembly checks.

• Carburetor and reed valve: Mikuni VM26SS removal, disassembly, inspection and assembly, float-height and fuel-level adjustment, reed-valve checks, and a carburetor sectional view.

• Autolube system: Pump removal and installation, delivery-line inspection, pump-output checks, and step-by-step air-bleeding procedures.

• Brakes, steering and suspension: Front drum and rear disc brake service, rear-axle bearing replacement, steering-knuckle inspection, toe-in adjustment, and swingarm side-clearance adjustment.

• Electrical diagnosis: YFS200U wiring and circuit diagrams, ignition and lighting troubleshooting charts, oil-level signal-system tests, cable-routing views, and illustrated meter connections.

These manuals were written primarily for Yamaha dealers and qualified mechanics and assume a basic understanding of mechanical service and repair procedures.

Internal Engine Repair and Assembly References

Detailed exploded views clarify component orientation during teardown and assembly. Inspection criteria appear alongside repair and replacement guidance, letting a mechanic compare dismantled parts with the requirements for the same assembly.

The engine chapter distinguishes components that can be serviced with the engine installed from work requiring engine removal. Internal coverage extends to piston rings, crankshaft bearings and seals, balancer-gear alignment, transmission engagement and shift-fork positioning.

Special-tool references include crankcase separating tool YU-01135 and crankshaft installing tool YU-90050. The clutch section covers housing and boss wear, pressure-plate alignment and release-mechanism adjustment.

Carburetor Settings and Autolube Service

The carburetor sectional view identifies the fuel passages, jets and starter circuit. Inspection guidance covers the needle valve and seat, throttle-slide movement and reed-petal sealing.

The base manual identifies the carburetor as 2XJ00; the YFS200A supplement uses 2XJ01 and supplies revised jetting and cold-weather setting charts. The supplement also updates regional spark-plug selections and lighting specifications.

Autolube procedures address air in the delivery system after oil-system disconnection, an empty oil tank or the machine being turned on its side. Pump inspection covers delivery-line obstructions, seals, the check ball and spring, and output verification.

Rear Axle, Brake Adjustment and Swingarm Fit

Rear-axle service includes bearing and seal replacement and a staged axle-nut tightening procedure. The manual warns that direct hammer blows to the axle end can damage its threads and splines.

Brake coverage includes the rear caliper’s ratchet and adjuster mechanism. Parking-brake adjustment is linked to a check for brake drag, while suspension service includes spring-preload adjustment and measured swingarm shim selection.

Always ensure you are working in a well-ventilated area with proper protective gear when handling heavy engine components or chemical solvents to prevent injury.

Ignition Fault Isolation and Circuit References

No-spark troubleshooting distinguishes the throttle and carburetor switch-control circuit from spark-plug, ignition-coil, source-coil and pickup-coil faults. Illustrated tester connections and wire-color references support fault tracing before a component is selected for replacement.

Separate ignition, lighting and oil-level signal-system circuit diagrams accompany the diagnostic sections. Mechanical troubleshooting charts address hard starting, poor running, shifting faults, clutch slipping or dragging, and unstable handling.

Engine and Ignition Specification Preview

The YFS200U engine data specify cylinder-head nut torque at 27 Nm and a crankshaft runout limit of 0.03 mm. Reed-valve thickness is listed as 0.35–0.49 mm, alongside stopper-height and bending-limit specifications.

Transmission oil quantity for a periodic change is 0.65 L, distinguished from the total-fill quantity.

For ignition diagnosis, pickup-coil resistance is specified at 16–24 ohms at 20°C between the white/red and black leads.