Sym Jet 100 User Manual (English)

Questions and Answers:

K
Kristina BridgesAug 8, 2025
Why is my Sym Jet 100 Scooter engine hard to start?
- P
  Paula MiddletonAug 8, 2025
  If your Sym Scooter engine is hard to start, there might be several reasons. It could be due to no fuel in the fuel tank, in which case you should check and adjust the fuel level. Another possibility is a clog in the pipes, fuel tank, carburetor, or intake vacuum, so inspect these components for blockages. A malfunction or loosen/damaged fuel pump vacuum could also be the culprit, requiring a check and adjustment. Additionally, try loosening the carburetor drain bolt to check for gasoline inside the carburetor, or remove the spark plug, install it into the spark plug cap, and perform a spark test against the engine ground.
B
bhallAug 16, 2025
What to do if Sym Jet 100 Scooter engine runs sluggish and speed doesn't pick up?
- C
  Christopher JohnsonAug 16, 2025
  If your Sym Scooter engine runs sluggish and the speed doesn't pick up, it could be due to several reasons. The air cleaner might be clogged, so check the ignition timing using an ignition lamp. Poor fuel supply could also be the issue; try gradual acceleration and check the engine speed. You should also check the cylinder compression pressure using a compression pressure gauge and inspect the carburetor for any clogs. Lastly, verify if the engine is overheating.
J
Jodi HernandezAug 23, 2025
Why Sym Scooter engine runs sluggish at high speed?
- M
  Mr. Wesley HuffmanAug 23, 2025
  If your Sym Scooter engine runs sluggish specifically at high speed, check the ignition timing. Also, if there is insufficient fuel in the fuel tank, a fuel filter clogged, or a restricted fuel tank vent, you should check the fuel supplying system in the automatic fuel cup. Furthermore, check if the carburetor is clogged.
B
Brandon SchultzAug 31, 2025
How to fix a Sym Jet 100 Scooter engine that runs sluggish in low speed?
- N
  nfloresAug 31, 2025
  If your Sym Scooter engine runs sluggish, especially at low speed and while idling, check the ignition timing using an ignition lamp. You can also adjust the air screw of the carburetor. Another step is to remove the spark plug, install it into the spark plug cap, and perform a spark test against the engine ground.

Sym Jet 100 Specifications

General

Fuel System	Carburetor
Rear Brake	Drum
Engine	4-Stroke
Cooling	Air-cooled
Transmission	Automatic
Engine Type	Single Cylinder
Top Speed	85 km/h

Summary

1. General Information

Symbols and Marks

Explains symbols used in the manual for service procedures.

General Safety Precautions

Outlines safety precautions for operating and servicing the motorcycle.

Service Precautions

Details essential precautions for performing service and maintenance tasks.

Technical Specifications

Lists detailed technical specifications for the motorcycle models.

Torque Values

Provides crucial torque specifications for various components.

Cables and Harness Routing

Guides on the proper routing and securing of electrical cables and harnesses.

Troubleshooting Guide

Offers solutions for common engine starting and running issues.

Lubrication Points

Identifies key points requiring lubrication for optimal component performance.

2. Service Maintenance Information

Periodical Maintenance Schedule

Outlines a schedule for regular inspections and maintenance tasks.

Air Cleaner

Instructions for inspecting and cleaning the air cleaner element.

Fuel Filter Service

Details procedures for inspecting and replacing the fuel filter.

Tire and Battery Maintenance

Guidelines for checking tire condition and battery service.

Brake System Hose

Procedures for inspecting the brake hose for damage and leaks.

Steering and Suspension Maintenance

Covers checks and adjustments for steering and suspension systems.

Spark Plug and Ignition Timing

Covers spark plug service and ignition timing checks.

Carburetor and Throttle Operation

Covers throttle operation and carburetor idle speed adjustment.

3. Lubrication System

Lubrication System Diagram

Illustrates the components and layout of the lubrication system.

Precautions and Lubricant

Highlights operation precautions and recommended lubricants.

Troubleshooting Lubrication Issues

Diagnoses and provides solutions for common lubrication problems.

Oil Pump Service

Covers removal, installation, and air bleeding of the oil pump.

Oil Tank Service

Details the removal and installation procedures for the oil tank.

4. Engine Removal

Maintenance Information

Lists components requiring engine removal for maintenance.

Engine Removal Procedure

Step-by-step instructions for safely removing the engine from the motorcycle.

Engine Installation Procedure

Step-by-step instructions for reinstalling the engine.

5. Cylinder Head/Cylinder/Piston

Maintenance and Troubleshooting

Covers inspection, maintenance, and troubleshooting for the cylinder assembly.

Cylinder Head Service

Detailed procedures for removing, cleaning, and installing the cylinder head.

Cylinder and Piston Service

Covers inspection, removal, and installation of cylinder and piston components.

6. Alternator

Maintenance Information

Provides precautions and coil resistance values for the AC alternator.

Alternator Removal

Step-by-step guide for removing the motorcycle's alternator assembly.

Alternator Installation

Step-by-step guide for installing the alternator assembly.

7. V-Type Belt Drive System/Kick-Starter

Maintenance and Troubleshooting

Covers specifications, troubleshooting, and service for the drive system.

Drive Belt Service

Details inspection, removal, and installation of the drive belt.

Movable Drive Face Service

Covers removal, inspection, and installation of the movable drive face.

Clutch/Driven Pulley Service

Procedures for disassembly, inspection, and assembly of clutch/driven pulley.

Kick Starter Service

Covers removal, disassembly, and reassembly of the kick starter mechanism.

8. Final Driving Mechanism

Maintenance and Troubleshooting

Covers specifications, troubleshooting, and special tools for the final drive.

Disassembly Procedure

Step-by-step guide for disassembling the final driving mechanism.

Inspection and Bearing Replacement

Covers inspection of drive components and bearing replacement.

Re-Assembly Procedure

Step-by-step guide for re-assembling the final driving mechanism.

9. Crankcase/Crankshaft

Maintenance and Troubleshooting

Covers crankcase disassembly requirements and troubleshooting engine noise.

Crankcase Disassembly and Crankshaft Removal

Detailed steps for disassembling the crankcase and removing the crankshaft.

Crankshaft Inspection

Procedures for inspecting crankshaft for run-out, clearance, and bearing condition.

Crankcase Installation

Step-by-step guide for installing the crankshaft and crankcase assemblies.

10. Fuel System

Maintenance and Troubleshooting

Covers fuel system precautions, specifications, and troubleshooting.

Throttle Valve Service

Details removal, inspection, and installation of the throttle valve.

Carburetor Service

Covers carburetor removal, auto by-starter, float, and installation.

Reed Valve Service

Procedures for inspecting and installing the reed valve.

Fuel Pump Service

Details inspection, removal, and installation of the fuel pump.

Air Cleaner Service

Instructions for removing and installing the air cleaner.

11. Brake System

Front Disc Brake System

Overview and components of the front disc brake system.

Rear Drum Brake System

Overview and components of the rear drum brake system.

Maintenance and Troubleshooting

Covers brake system precautions, specifications, and troubleshooting.

Hydraulic Disc Brake Service

Details procedures for brake fluid replacement and bleeding.

Brake Disc Service

Covers inspection and service for the brake disc and master cylinder.

12. Body Cover

Body Overview

Illustrates the different body cover components of the motorcycle.

Maintenance Information and Disassembly Sequence

Provides information on body cover removal and reassembly sequence.

Side Covers and Luggage Box

Details removal and installation of side covers and the luggage box.

Body Cover Removal and Installation

Step-by-step guide for removing and installing main body covers.

Front Cover and Components

Covers removal of front cover, spoiler, and inner box.

Fender and Handlebar Covers

Details removal of front fender and handlebar covers.

13. Steering/Front Wheel/Suspension

Maintenance and Troubleshooting

Covers steering, wheel, and suspension specifications and troubleshooting.

Steering Handle Service

Procedures for removing, installing, and adjusting the steering handle.

Front Wheel Service

Covers front wheel removal, inspection, and installation.

Front Shock Absorber Service

Details removal and installation procedures for the front shock absorber.

Front Fork Service

Covers removal, inspection, and installation of the front fork assembly.

14. Rear Wheel/Suspension

Maintenance and Troubleshooting

Covers rear wheel and suspension specifications and troubleshooting.

Rear Wheel Service

Details removal, inspection, and installation of the rear wheel.

Brake Hub Replacement

Procedures for replacing the rear brake hub assembly.

Rear Shock Absorber Service

Details removal and installation procedures for the rear shock absorber.

15. Electrical Equipment

Maintenance and Troubleshooting

Covers electrical system precautions, specifications, and troubleshooting.

Battery Service

Details battery removal, installation, voltage check, and charging procedures.

Charging System Service

Explains charging system diagrams and voltage/current inspections.

Ignition System Service

Covers ignition system diagrams and ignition coil inspection.

Starting System Service

Details starter motor and pinion removal, installation, and inspection.

Switches and Indicators

Covers service for oil level switch, fuel unit, and various switches/horns.

Bulb Replacement

Guides on replacing headlight, taillight, and indicator bulbs.

16. Electrical Diagram

JET 50 Electrical Diagram

Wiring diagram for the JET 50 model.

JET 50 EURO Electrical Diagram

Wiring diagram for the JET 50 EURO model.

JET 100 Electrical Diagram

Wiring diagram for the JET 100 model.

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142 pages

Sym Jet 100 User Manual

Table of Contents

Questions and Answers:

Sym Jet 100 Specifications

Summary

1. General Information

Symbols and Marks

General Safety Precautions

Service Precautions

Technical Specifications

Torque Values

Cables and Harness Routing

Troubleshooting Guide

Lubrication Points

2. Service Maintenance Information

Periodical Maintenance Schedule

Air Cleaner

Fuel Filter Service

Tire and Battery Maintenance

Brake System Hose

Steering and Suspension Maintenance

Spark Plug and Ignition Timing

Carburetor and Throttle Operation

3. Lubrication System

Lubrication System Diagram

Precautions and Lubricant

Troubleshooting Lubrication Issues

Oil Pump Service

Oil Tank Service

4. Engine Removal

Maintenance Information

Engine Removal Procedure

Engine Installation Procedure

5. Cylinder Head/Cylinder/Piston

Maintenance and Troubleshooting

Cylinder Head Service

Cylinder and Piston Service

6. Alternator

Maintenance Information

Alternator Removal

Alternator Installation

7. V-Type Belt Drive System/Kick-Starter

Maintenance and Troubleshooting

Drive Belt Service

Movable Drive Face Service

Clutch/Driven Pulley Service

Kick Starter Service

8. Final Driving Mechanism

Maintenance and Troubleshooting

Disassembly Procedure

Inspection and Bearing Replacement

Re-Assembly Procedure

9. Crankcase/Crankshaft

Maintenance and Troubleshooting

Crankcase Disassembly and Crankshaft Removal

Crankshaft Inspection

Crankcase Installation

10. Fuel System

Maintenance and Troubleshooting

Throttle Valve Service

Carburetor Service

Reed Valve Service

Fuel Pump Service

Air Cleaner Service

11. Brake System

Front Disc Brake System

Rear Drum Brake System

Maintenance and Troubleshooting

Hydraulic Disc Brake Service

Brake Disc Service

12. Body Cover

Body Overview

Maintenance Information and Disassembly Sequence

Side Covers and Luggage Box

Body Cover Removal and Installation

Front Cover and Components

Fender and Handlebar Covers

13. Steering/Front Wheel/Suspension

Maintenance and Troubleshooting

Steering Handle Service