To learn how to independently repair your scooter, you need observation, logic and basic knowledge of the structure of the device. All these skills, together with practical skills, will help to detect and quickly eliminate minor faults in time.
It is necessary
- - a set of open-end and spanner wrenches, socket heads;
- - screwdrivers with flat and cross-shaped blades;
- - tester, insulating tape.
Instructions
Step 1
If the engine does not start, check if the key in the ignition switch is turned to the desired position, if the lever of one of the brakes is pressed. Check the serviceability of the brake light bulb or its electrical circuit. Check and replace the fuse in the main circuit of the electric starter if necessary. Check the terminals on the battery. Strip them from oxides, measure the battery voltage and charge if necessary. You can temporarily kick-start the scooter.
Step 2
Check for a faulty electric starter circuit. Clean the contacts on the relay and starter, ring the relay, starter windings and scooter wiring. If the kickstarter cranks, check and replace defective kickstarter or ratchet gears. Unscrew the carburetor float chamber drain screw. If there is no gasoline in it, clean the filter of the gas valve and blow out the fuel line, check the serviceability of the gas valve itself, the tightness of the vacuum hose of its control. If the carburetor fuel valve sticks, remove the float chamber cover and clean the valve seat. If this does not help, replace the valve.
Step 3
Unscrew the candle. If it is covered with a layer of unburned fuel, disassemble the carburetor, check the fuel level in the float chamber and clean the air filter. Check the auto start enricher and spark plug for serviceability. If it is absent, clean the spark plug electrodes with sandpaper or replace. If this does not help, check the health of other elements of the ignition system.
Step 4
If the engine is unstable, check the tightness of the carburetor inlet fitting and replace the gasket. Replace the crankshaft oil seals. Remove the water in the float chamber by unscrewing the drain screw of the float chamber. Blow out the carburetor jets and passages. Change the gasoline in the tank. Unscrew the spark plug. If there is water on the insulator and electrodes, dispose of it in the carburetor float chamber by unscrewing the drain screw.
Step 5
If there is black oily carbon deposits on the insulator and the electrodes of the spark plug, replace it with a similar one with a lower heat rating. Check and clean the vent in the fuel tank cap. Check the compression using a compression gauge. If it is not correct, replace the piston, cylinder and piston rings. If there are oily traces on the head and cylinder, replace the gasket under the cylinder head or tighten its fastening nuts with the force and in the sequence recommended by the repair manual.
Step 6
If there are extraneous sounds on a running engine, adjust the thermal clearances in the valve drive of four-stroke engines. Check the tension and adjust the valve drive chain. Replace worn pulleys, rollers and other parts of the variator with new ones. If the engine stalls with a sharp opening of the throttle valve, check if the engine is warmed up enough, check the carburetor adjustments and its main metering system, the correct operation of the variator.
Step 7
If the engine does not pick up speed, smokes, consumes a lot of fuel, and black deposits have formed on the spark plug electrode, adjust the carburetor or install a smaller main jet. If there is knocking and white plaque on the spark plug, also adjust the carburetor or install a larger main jet. Also, check the muffler, passages and cylinder ports for clogging. Clean them up. If the muffler cannot be cleaned, replace it.
Step 8
If the engine starts to lose power while riding, check the fan blades and shrouds on the air-cooled engine. Replace damaged, broken and chipped. On a liquid-cooled engine, check for coolant leaks by changing the level in the reservoir. Replace the water pump, thermostat, radiator if necessary.
