Yamaha YP250 Majesty 1995–2000 Service Manual Set (P/N 4UC-AE1)

The base manual provides the original workshop procedures. The supplement documents changes to the YP250M’s components, service procedures, and specifications.

For complete YP250M service procedures, Yamaha also calls for the YP250 (K) ’98 supplement (4UC-AE2) and the YP250D ’98 supplement (5DF-AE1). Those two publications are separate from this download.

PDF search and chapter navigation

Search, bookmarks, and diagram detail — Both PDFs have searchable service text and wiring diagram legends, plus bookmarks for the chapters and full wiring diagrams. The covers and lettering drawn as part of the schematics sit outside the searchable text. Some menu bookmarks point to separate files. Zoom in to read the small connector markings and wire-color codes.

The ZIP contains two printable PDFs totaling 370 pages, including both original covers and 17 blank or mostly blank separator pages.

Engine, drive, and electrical service

These selected highlights cover common workshop jobs. Other topics include coolant temperature gauge diagnosis and headlight aim adjustment.

• Periodic maintenance — Service intervals, valve-clearance and idle adjustments, engine and transmission oil changes, coolant replacement, and hydraulic brake bleeding.

• Engine repair — Step-by-step procedures for engine removal and installation, cylinder-head disassembly, valve and piston inspection, and crankcase and crankshaft work.

• V-belt drive — Centrifugal clutch and sheave disassembly, belt and roller-weight inspection, and transmission removal and installation.

• Cooling and fuel — Radiator inspection, water-pump service, thermostat testing, carburetor disassembly and reassembly, and fuel-level adjustment.

• Brakes and chassis — Front master cylinder and caliper overhaul, base-model rear drum brake service, wheel balancing, front fork service, and steering work.

• Electrical diagnosis — Full wiring diagrams, switch-terminal charts, and troubleshooting for ignition, charging, electric starting, lighting, and signals.

• YP250M updates — Air-induction inspection, throttle position sensor adjustment, front wheel speed sensor and rotor checks, and electric fuel pump diagnosis.

Yamaha wrote these procedures for qualified mechanics familiar with scooter repair, electrical testing, and the use of special tools.

Engine overhaul and workshop tools

The base manual covers ignition timing, compression and oil-pressure checks, and the locations of the frame and engine markings and model label. The supplement updates the maintenance schedules, body-panel and fuel-tank access, and cable routing.

Exploded views and job charts show the camshaft and rocker arms, valve seats, and piston-ring installation. The overhaul chapter also covers the oil pump, A.C. magneto, and starter clutch. Component torque tables, lubricant charts, and wear limits support inspection and reassembly.

Tool references identify the valve adjusting tool (90890-01311), clutch spring compressor (90890-01337) and holder arm (90890-01464), and secondary sheave oil seal guide (90890-01384). The supplement specifies the crankcase separating tool (90890-01135) and matching crankshaft installer components.

Wheel, steering, and cooling repairs

The chassis procedures cover wheel bearings, handlebar and steering work, and rear shock and swingarm removal. The YP250M supplement gives revised rear wheel and swingarm layouts. A failed front wheel speed sensor is replaced as a unit, and damage to the press-fit rotor calls for a wheel assembly. Debris left in the hub can damage the sensor or rotor.

The base manual flags two assembly risks. Fitting a steering bearing race out of square can damage the head pipe, and careless water-pump impeller shaft installation can damage the oil seal lip or displace its spring.

Fuel delivery and electrical fault tracing

The base model uses a vacuum fuel pump. The YP250M’s electric pump is controlled through the ignitor and relay, and its troubleshooting chart separates relay, pump, and wiring checks when fuel delivery stops.

The base manual explains oil indicator reset and diagnosis, auto-choke operation, and the sidestand ignition cut-off. Its symptom charts point to components to inspect for hard starting, poor idle, clutch faults, overheating, weak braking, fork leaks, unstable handling, and starter or lighting faults before teardown.

Ignition, charging, electric starting, and cooling circuit diagrams support component checks. The YP250M wiring diagram also identifies the seat switch, storage-box light, clock, and optional grip-warmer circuit.

Securely support the scooter where required and follow Yamaha’s warnings for brake-hydraulic work, hot coolant, fuel testing, and compressed clutch springs.

Sample V-belt and speed sensor checks

Both publications list a standard drive belt width of 22.6 mm and a wear limit of 21.0 mm for V-belt inspection.

For the YP250M (5GM7), the front wheel speed sensor check specifies 1.19–2.21 kΩ at 20°C across the sensor connector terminals.