1999–2000 Yamaha YFA1M(C) Breeze ATV Service Manual Set

The supplement supplies revised specifications and maintenance information to use alongside the base manual’s repair procedures. Its California-specific carburetor data and updated electrical specifications must be distinguished from the earlier YFA1(W) data; the included electrical diagrams are labeled YFA1(W).

PDF Bookmarks and Wiring Detail

Search and navigation: The service pages are not text-searchable. Embedded bookmarks provide access to service chapters and electrical sections, although some opening links lead to introductory or contents pages. Small wire-color codes and connector markings require zooming.

One printable, English-language, 258-page PDF contains both publications above, plus a one-page added cover and a one-page navigation guide. These two additional pages are included in the total.

Engine, V-Belt Drive, and Electrical Service

This is a selection of the documented work, rather than a full contents list. Other topics include fender removal and headlight beam adjustment.

• Engine overhaul: Step-by-step procedures for engine removal, crankcase separation, cylinder-head repair, piston inspection, timing-chain installation, and engine reassembly.

• Automatic transmission: Primary and secondary sheave service, centrifugal clutch inspection, V-belt replacement, and internal transmission and shifter repair.

• Carburetion: Mikuni VM18SH disassembly, jet and needle-valve inspection, reassembly, float-height adjustment, and fuel-level checking.

• Chassis repair: Swing-axle front suspension, rear swingarm, shock absorbers, steering, drum brakes, wheel bearings, and drive-chain service.

• Electrical diagnosis: Ignition, electric starting, charging, lighting, and indicator-system circuit diagrams, component tests, and troubleshooting charts.

• Scheduled maintenance: Valve-clearance adjustment, compression testing, lubrication schedules, fuel-line inspection, exhaust checks, and supplement-specific spark-arrester cleaning.

The internal repair and electrical test sections suit mechanics familiar with engine measurement and circuit testing, with access to the specified service tools.

Engine Overhaul and Transmission Inspection

The engine chapter extends beyond removal and installation into valve-seat refacing, valve-guide replacement, crankshaft and connecting-rod inspection, and oil-pump clearance checks. Assembly drawings identify the valve and rocker-arm components, camshaft and timing chain, transmission, and primary and secondary sheaves.

Having the procedures and component specifications together supports checking measured wear against the relevant repair criteria at the vehicle. The manual also distinguishes assemblies that can be serviced with the engine installed from work requiring deeper disassembly.

Transmission coverage includes the shift cam, shift fork, guide bar, gear dogs, and axle runout. Separate troubleshooting charts address failure to move, clutch disengagement problems, weak standing starts, and poor acceleration.

Carburetor Variants and Fuel-System Service

The carburetor sectional view identifies the pilot, main, and needle circuits. Inspection instructions cover the throttle valve, starter plunger, float, needle valve, and valve seat, followed by reassembly and adjustment procedures.

The supplement separates California and non-California carburetor identification marks and jetting. It also revises float-height and fuel-level specifications, so the base carburetor settings should not be treated as interchangeable with the supplement’s data.

Brakes, Steering, and Rear-Axle Work

Chassis procedures cover drum and lining inspection, brake-cam installation, wheel-bearing replacement, steering-column service, tie-rod adjustment, and swingarm inspection. Rear-axle installation includes a staged nut-tightening procedure rather than a single general torque value.

The rear-axle section warns that direct hammer blows can damage the axle threads and splines. Drive-chain cleaning guidance also identifies steam cleaning, high-pressure washing, and unsuitable solvents as causes of O-ring damage.

Support the ATV securely for wheel and suspension work, and follow the manual’s fuel-system precautions.

Circuit Tests and Workshop References

System-specific fault charts connect symptoms with switch continuity, coil resistance, relay operation, charging output, and harness checks. Starter-motor coverage includes disassembly, brush and commutator inspection, armature testing, and reassembly.

The YFA1(W) Circuit Diagram and final Wiring Diagram show component connections and wire-color codes. Cable Routing drawings, the Lubrication Diagram, and the Carburetor Sectional View provide additional orientation during service.

Component torque tables use Nm, m-kg, and ft-lb. Other references include piston-to-cylinder clearance, valve-spring dimensions, transmission-axle runout, and Yamaha special-tool identifiers, including the crankcase separating tool 90890-01135 and clutch spring holder 90890-01337.

Selected Valve and Pickup-Coil Specifications

The YFA1M(C) supplement lists cold intake-valve clearance at 0.08–0.12 mm and cold exhaust-valve clearance at 0.10–0.14 mm, alongside its valve-train inspection data.

For the YFA1M(C) CDI magneto pickup coil, the specified resistance is 248–372 ohms at 20°C across the red and gray leads. This supplement value differs from the earlier YFA1(W) electrical specification.