How to start Sym MAXSYM 400i Scooter if the engine won't start?
If your Sym Scooter's engine won't start or is hard to start, you can try the following: check and adjust components, press the fuel injector feed pipe to see if there's fuel, check the spark plug's ignition, perform a cylinder compression pressure test, try restarting the engine, and remove and inspect the spark plug.
Why is my Sym Scooter engine running sluggish and losing power?
If your Sym Scooter engine runs sluggish and lacks power, check if the engine is overheated. Also, gradually accelerate and check the engine RPM. Inspect the ignition timing using an ignition lamp and check the cylinder compression pressure. Verify if the fuel injector is clogged and remove and check the spark plug. Ensure you continually drive in acceleration or at high speed.
What to do if Sym Scooter engine runs sluggish at high speed?
If your Sym Scooter engine runs sluggish at high speed, check the ignition timing, the fuel pump supply condition, and whether the fuel injector is clogged.
Why does my Sym Scooter engine run sluggish at low speed and idling?
If your Sym Scooter engine runs sluggish, especially at low speed and while idling, check the ignition timing using an ignition lamp. Also, check for any air sucked in through the throttle body insulator gasket, and remove the spark plug to check for a spark.
General| Displacement | 399 cc |
|---|---|
| Fuel System | Electronic Fuel Injection |
| Cooling System | Liquid cooled |
| Transmission | CVT |
| Front Suspension | Telescopic fork |
| Seat Height | 800 mm |
| Weight | 215 kg |
| Tires Front | 120/70-15 |
| Tires Rear | 160/60-14 |
| Engine Type | Single-cylinder, 4-stroke |
| Front Brake | Disc |
| Rear Brake | Disc |
| Fuel Capacity | 13 liters |
| Rear Suspension | Dual shock absorbers |
Explains symbols and their meanings used in the manual.
Critical safety guidelines for handling and servicing the motorcycle.
Essential preparation steps before commencing service work.
Technical data and measurements for motorcycle components.
Specific torque settings for fasteners and bolts.
Common issues and diagnostic steps for problem resolution.
Identification of all lubrication points on the motorcycle.
General safety and operational guidelines for maintenance.
Recommended maintenance intervals and tasks.
Information and procedures for engine oil.
Steps for cleaning the engine oil strainer.
Specifications and procedures for gear oil.
Inspection and maintenance of fuel lines and cables.
Maintenance procedures for the air cleaner element.
Information on the PCV system.
Procedures for checking and adjusting valve clearance.
Specifications and replacement of the spark plug.
How to measure and interpret cylinder compression.
Inspection and replacement of the drive belt.
Maintenance of the steering handle top bearing.
Inspection and maintenance of front and rear suspension cushions.
Maintenance and service of the disk brake system.
Inspection and function of brake light and start switches.
Checking tire pressure and condition.
Maintenance and handling of the battery.
Importance of checking fastener tightness.
List of specialized tools required for maintenance.
Safety and operational notes for lubrication system maintenance.
Technical data for engine oil and gear oil quantities.
Torque specifications for lubrication system components.
Common problems and solutions for the lubrication system.
Overview of the electronic fuel injection system components.
Illustrates the layout of EFI system components on the vehicle.
How the EFI system components work together.
Introduction to the EFI system and its features.
Components and description of the fuel delivery system.
Principles and specifications of the ignition system.
Description and function of the CPS sensor.
Details on MAP, TW, and TA sensors.
Function and testing of the O2 sensor.
Function and testing of the TPS sensor.
Operation and testing of the ISC stepper motor.
Function and testing of the AISV.
Procedures for diagnosing EFI system faults.
A table summarizing troubleshooting steps based on symptoms.
Safety and operational guidelines before engine removal.
Technical data for engine oil, gear oil, and coolant capacities.
Torque specifications for engine mounting and related bolts.
Steps to disconnect and remove the engine from the chassis.
Procedures for reinstalling the engine onto the frame.
Exploded view of the cylinder head and valve components.
Safety and operational notes for cylinder head service.
Common problems related to cylinder head and valves.
Steps to remove the cylinder head from the engine.
Procedures for taking apart the cylinder head.
Methods for inspecting cylinder head and component wear.
Process for replacing valve stems.
Inspecting and servicing valve seats.
Steps for reassembling the cylinder head.
Procedures for installing the cylinder head onto the engine.
How to adjust the valve clearance.
Exploded view of cylinder and piston parts.
Safety notes for cylinder and piston service.
Common issues related to cylinder and piston performance.
Steps to remove the cylinder and piston assembly.
Proper procedure for installing piston rings.
Steps for installing the piston into the cylinder.
Procedures for installing the cylinder.
Exploded view of the V-belt drive system.
Safety and operational notes for the V-belt drive system.
Common issues and solutions for the V-belt drive system.
Procedures for removing and installing the left crankcase cover.
Checking the bearing on the left crankcase cover.
Procedures for replacing bearings using special tools.
Inspection and replacement of the V-belt.
Maintenance and inspection of the drive face components.
Inspecting weight rollers, drive face boss, and movable drive face.
Reassembling drive face components.
Service and disassembly of the clutch outer and driven pulley.
Measuring the inner diameter of the clutch outer.
Checking and replacing clutch weights.
Measuring and replacing the driven pulley spring.
Inspecting and replacing driven pulley components.
Checking the driven pulley bearings.
Steps for replacing clutch weights.
Procedures for replacing the driven pulley bearing.
Assembling the clutch outer and driven pulley.
Exploded view of the final drive mechanism.
Safety and operational notes for the final drive.
Common problems and solutions for the final drive.
Steps to disassemble the final drive mechanism.
Inspecting components of the final drive.
Procedures for replacing bearings in the final drive.
Steps for reassembling the final drive mechanism.
Exploded view of AC generator and starting clutch components.
Safety and operational notes for AC generator/clutch service.
Steps to remove the right crankcase cover.
Procedures for removing the AC generator set.
Steps to remove the flywheel.
Procedures for installing the flywheel.
Steps for installing the AC generator set.
Procedures for installing the right crankcase cover.
Exploded view of crankshaft and crankcase components.
Safety and operational notes for crankshaft/crankcase service.
Common issues and solutions for crankshaft/crankcase problems.
Steps for replacing crankshaft bearings.
Procedures for installing crankshaft bearings.
Steps to disassemble the crankcase.
Procedures for assembling the crankcase.
Exploded view of the cooling system components.
Safety and operational notes for cooling system service.
Common problems and solutions for the cooling system.
Procedures for testing the cooling system.
Inspection and removal/installation of the radiator.
Procedure for refilling coolant and bleeding air.
Exploded view of the motorcycle's body covers.
Sequence for disassembling and assembling body covers.
Steps for removing and installing the handle covers.
Procedures for removing and installing the front cover assembly.
Steps for removing and installing the meter panel.
Procedures for removing and installing the inner box components.
Steps for removing and installing the side covers.
Procedures for removing and installing the rear carrier.
Steps for removing and installing the luggage box.
Procedures for removing and installing the rear body cover.
Steps for removing and installing the floor panel.
Procedures for removing and installing the front fender.
Exploded view of the brake system components.
Safety and operational notes for brake system service.
Common brake system problems and solutions.
Inspecting the disk brake system components.
Procedure for adding brake fluid.
Steps for replacing brake fluid and bleeding the system.
Service and replacement of the front brake caliper.
Service and replacement of the rear brake caliper.
Inspection and service of the brake disks.
Maintenance and service of the master cylinder.
Explanation and function of the ABS system.
Exploded view of the steering handle assembly.
Safety and operational notes for steering handle service.
Common steering issues and their solutions.
Steps for removing and installing the handle covers.
Procedures for removing and installing the front cover assembly.
Steps for removing and installing the meter panel.
Procedures for removing and installing the inner box components.
Removal, inspection, and installation of the front wheel.
Checking wheel axle, bearings, and rim run-out.
Procedures for replacing front wheel bearings.
Steps to remove brake disk and bearings from the wheel.
Reassembly of the front wheel components.
Maintenance of the front suspension forks.
Service and adjustment of the steering stem and bearings.
Steps for adjusting the steering stem tightness.
Exploded view of rear wheel, fork, and cushion assembly.
Safety and operational notes for rear assembly service.
Common problems and solutions for the rear wheel and brake systems.
Procedures for removing and installing the muffler.
Removal, inspection, and installation of the rear wheel.
Checking the rear wheel rim for run-out.
Procedures for installing the rear wheel.
Maintenance of the rear fork and its bearings.
Inspecting rear fork bearings and fit.
Procedures for replacing rear fork bearings.
Removal and installation of the rear suspension cushion.
Wiring diagram and component layout of the electrical system.
Safety, specs, and diagnostic steps for the electrical system.
Maintenance, charging, and testing of the battery and charging system.
Service and troubleshooting for ignition and starting components.
Maintenance of switches, lights, horn, and meter units.
Service for fuel unit and cooling fan thermo switch.
Testing of thermo unit and water temperature meter.
Steps to remove and install the meter assembly.
Wiring schematic for the MAXSYM 400i model.
Wiring schematics for both MAXSYM 400i and 600i models.
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