1986-1991 Yamaha Jog 50, CE50, CG50 Scooter Service Manual

Yamaha Jog 50 CE50S 1986–1991 Technical Documentation

• Covers 1986–1991 Yamaha Jog 50, CE50, and CE50S scooters, including standard and performance-oriented configurations
• Official Yamaha publication P/N LIT-11616-05-43, first edition September 1985
• Contains 12 exploded-view diagrams, 8 torque tables, and full electrical wiring schematic
• Stored against your account so you can retrieve it after a hard-drive loss
• Full-text search finds any part number in seconds
• Laid out for standard letter and A4 printing
• This 1985 first edition serves as the original baseline factory reference for the 1986–1991 Yamaha Jog 50 model series production

Contents Overview

The 1986–1991 Yamaha Jog 50 service manual documents the complete teardown and assembly for the 50cc two-stroke platform. The content structure guides a qualified mechanic through system-wide maintenance, covering engine overhaul procedures, carburetor tuning for the auto-choke system, chassis adjustments, and electrical system troubleshooting. Detailed chapters provide specialized information on the primary and secondary sheaves, the autolube pump, and the C.D.I. magneto assembly.

Additional sections document chassis-specific tasks such as steering head adjustments, brake lever free-play settings, and tire inspection parameters. The manual includes essential data for internal engine measurements, including bore wear limits, piston-to-cylinder clearance thresholds, and transmission oil capacities.

Specifications and Technical References

Factory values provide clear benchmarks for maintenance. The compression pressure is documented at 784 kPa (114 psi) at sea level, with an engine idle speed range between 1,500 and 2,100 r/min. Cylinder head holding nuts are specified at 10 Nm (7.2 ft-lb). Understanding factory workshop documentation is structured enables owners to perform service with confidence. Cylinder bore wear limits are defined at 40.1 mm, and V-belt width service limits are set at 13.5 mm. Battery specific gravity is listed as 1.280 at 20°C for optimal performance. All service data shown here is for reference only — qualified technicians and the original OEM documentation remain the authoritative source for any hands-on work. This factory-authorized 100-page service manual covers the 1986–1991 Yamaha Jog 50, providing precise specifications for the engine, chassis, electrical, and fuel-injection systems found in the original two-stroke build.