A hard-starting scooter's problems are often attributable to a loss of electrical spark at the motor's spark plug or a problem within the fuel system. Some detective work is required to determine the exact cause of the problem but does not require too much technical knowledge once you know what to look for. Once the problem is identified, making the appropriate repairs can get the scooter up and running once again. Don't be afraid to contact your scooter's dealership for help if you can't figure out the problem.
Things You'll Need
- Automatic battery charger
- Phillips head screwdriver
- Spark plug socket
- Socket wrench
- Spark plug
- Carburetor cleaning spray
Open the scooter's seat with the ignition key and unscrew the gas cap. Check the gas level inside the tank visually. Rock the scooter from side to side and listen for a splashing sound as the gas moves inside the tank. Fill the tank with fresh gas if you cannot see the gas level or hear gas splashing inside the tank.
Test the battery under the seat with a multimeter. Set the multimeter's knob to read a Direct Current (DC) voltage scale. Place the meter's red lead onto the battery's positive (+) terminal and the black lead onto the battery's negative (-) terminal. Recharge the battery with an automatic battery charger if the battery's voltage is less than 12.5 volts DC.
Unscrew the small panel from the center of the scooter's floorboard with a Phillips head screwdriver to access the spark plug. Pull the spark plug wire off of the end of the spark plug. Unscrew the spark plug from the motor with a spark plug socket and wrench. Push a wire onto the end of the spark plug. Place the tip of the spark plug against the motor and start the scooter. Replace the spark plug if a blue spark is not emitted from the end of the spark plug.
Locate the carburetor on the left side of the scooter, just above the motor. Pull the fuel line off of the carburetor. Loosen the clamps on both ends of the carburetor with the Phillips head screwdriver then pull the carburetor away from the motor. Unscrew the float bowl from the bottom of the carburetor with the screwdriver. Spray the jets--the tiny fuel nozzles inside the float bowl--with carburetor cleaning spray and pass a small wire through their openings. Reinstall the float bowl and carburetor onto the scooter.
- "The Professional Motorcycle Repair Program"; Professional Career Development Institute; 1995
- "Yamaha YW50S Zuma Service Manual"; Yamaha Motor Corp.; 2004
- "Honda CHF50 Service Manual"; Honda Motor Co.; 2007
- Photo Credit Jonny Basker/Photodisc/Getty Images
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