2000 Yamaha EW50 Slider Scooter Service & Repair Manual (P/N 5JH1-AE1)

This service manual covers the 2000 Yamaha EW50 Slider, with factory maintenance and repair information published by MBK Industrie. The first edition is dated September 1999, and the cover carries the identifier 5JH1-AE1.

Searchable Text, Chapter Bookmarks and Wiring Detail

Finding procedures and circuit details: PDF text is searchable, and embedded bookmarks open all eight chapters and the final wiring diagram. Small wire-color codes and connector labels in the circuit drawings require zooming for comfortable reading.

Supplied as one printable English PDF with 228 pages, including six opening pages, eight chapter-divider pages and the final wiring diagram.

Engine Overhaul, Belt Drive and Electrical Troubleshooting

Beyond these selected topics, the manual also includes headlight beam adjustment and centerstand lubrication.

• Engine overhaul: Engine removal and installation, cylinder and piston inspection, crankcase separation, crankshaft installation, and transmission shaft and bearing checks.

• Belt drive and clutch: Primary and secondary pulley disassembly, V-belt inspection, clutch shoe checks, secondary sheave service, and kickstarter repair.

• Carburetor and intake: Separate Dell’Orto and Teikei disassembly procedures, jet and needle inspection, carburetor assembly, fuel cock testing, and reed valve checks.

• Brake service: Front master cylinder and caliper inspection, brake pad replacement, hydraulic bleeding, and rear drum brake shoe and camshaft service.

• Suspension and steering: Front fork disassembly and seal replacement, steering head bearing inspection and adjustment, wheel bearing replacement, and rear shock absorber checks.

• Electrical diagnosis: Ignition, starting, charging, lighting and signal-system troubleshooting, supported by circuit diagrams, switch continuity charts and component test specifications.

Written primarily for Yamaha and MBK dealers and their qualified mechanics, this manual assumes a basic understanding of mechanics and scooter repair techniques.

Engine Overhaul and Belt Drive Repair

The overhaul sections pair component inspections with wear limits and assembly drawings, helping you assess parts for reuse or replacement before reassembly. Coverage extends to piston rings, connecting rod checks, crankshaft runout, starter clutch operation and transmission bearings.

Step-by-step procedures cover crankcase separation and crankshaft installation. Tool references include crankcase separator 90890-01135 and clutch spring holder 90890-01337, making the equipment requirements clear before those jobs begin.

Primary and secondary pulley exploded views identify the belt-drive hardware. Inspection goes beyond belt replacement to cover roller weights, clutch shoes, the torque cam groove and secondary sheave seals. Assembly cautions address seal-lip damage and grease contamination of the V-belt and clutch.

The Autolube sections cover delivery-line and drive-gear inspection, pump installation, and air bleeding of the pump housing and oil hose. The troubleshooting chapter identifies air in the Autolube pump among possible overheating causes.

Carburetor Differences and Intake Checks

Separate Dell’Orto and Teikei carburetor disassembly views show the internal components. The specifications distinguish PHBN 12, 5FX and 5LH settings, including jetting, needle positions and pilot screw adjustments, so settings can be matched to the installed carburetor.

The assembly section identifies float height as factory-set and warns against adjusting it. Fuel cock testing and reed valve sealing checks extend the diagnosis beyond the carburetor itself.

Brakes, Fork Seals and Steering Bearings

The chassis chapter includes master cylinder and caliper inspection, front wheel static balancing, and steering bearing replacement and adjustment. Cable routing drawings show the intended positions of the wiring harness, control cables and front brake hose.

Front fork exploded views accompany disassembly and seal installation procedures. The fork chapter warns that bottoming the inner tube during disassembly can damage the oil flow stopper.

Fork oil quantity: The specifications table and fork assembly section give conflicting fill quantities. The applicable quantity needs to be resolved for the installed fork before refilling.

Observe proper shop safety precautions when handling brake fluid or fuel.

Circuit Testing and Fault Isolation

Electrical troubleshooting charts distinguish no-spark faults, starter motor failures, charging problems and individual lighting or signal faults. Test illustrations identify meter connections and lead colors for component checks.

The EW50 Wiring Diagram includes component identification and a wire-color legend. These references connect the electrical tests to the harness, while the general troubleshooting chapter groups possible causes of hard starting, poor acceleration, overheating and unstable handling.

Examples of Cylinder-Head and Ignition Specifications

The cylinder-head drawing specifies 10 Nm for the retaining nuts.

Maintenance data gives a spark plug gap of 0.5–0.7 mm. The electrical specifications list constant ignition timing of 14° BTDC at 5000 r/min.