How to Service a Yamaha Majesty

Part of responsible vehicle ownership entails regularly servicing a vehicle to ensure safety, long vehicle life, and optimum performance. Like all of the company's vehicles, Yamaha scooters require regular maintenance, much of which can be done at home for a lower cost than at the shop. To aid owners through this process, Yamaha provides maintenance charts and instructions in its owner's manual for every scooter. The Majesty is no exception. In addition to regular tuning and lubrication, the owner's manual includes detailed instructions for three important servicing jobs.

Start the Yamaha Majesty and allow the engine to warm up for several minutes. Park the scooter on level ground and turn off the engine.

Remove the screws for "Panel B," located at the back of the scooter, and remove Panel B to access the engine. Place an oil pan beneath the engine to collect drained oil.

Remove the engine oil fill cap, located at the top of the oil tank. Next, use a wrench to remove the engine oil drain bolt and washer from the bottom of the tank. The oil should drain smoothly from the bottom of the oil tank and into the oil pan.

Inspect the oil drain bolt for any signs of damage or serious wear. Replace it if necessary.

Allow the oil to drain fully from the tank. Next, screw the oil drain bolt and washer back in place and refill the oil tank with engine oil. The Yamaha Majesty takes YAMALUBE 10W-40 or SAE 10W-30 engine oil.

Pour the oil until the oil level reaches between the two marks on the side of the dipstick, which is connected to the bottom of the oil filler cap. Once it does, screw the oil filler cap and dipstick back in place.

Reinstall Panel B.

Locate the single spark plug by unscrewing and removing the scooter's seat, pulling up the storage compartment, and unscrewing and removing the spark plug cover.

Remove the spark plug cap and unscrew the spark plug using a spark plug wrench.

Inspect the electrode insulator tip at the end of the spark plug. It should be firm and light-to-medium tan in colour. If it is burnt, brittle or cracked, replace the spark plug with a new NGK CR7E plug.

Measure the spark plug gap -- the distance between the hook at one end of the plug -- using a wire thickness gauge. The gap should measure between 0.028 and 0.031 inches.

Widen the spark plug gap if necessary by pulling the hook wider with a spark plug gap tool.

Tighten the gap by gently pressing the hook against a firm surface.

Reinstall the spark plug with the spark plug wrench. Return the spark plug cap and cover, and reinstall the Majesty's seat.

Unscrew and remove "Cowling A," located at the very back end of the scooter, to access the scooter's battery.

Remove the straps holding the battery in place and the battery cables, taking care to unscrew and remove the black, or negative, cable first and the red, or positive, one second. Remove the battery from the scooter.

Tighten and clean the battery terminal. Use a wire-bristle brush to remove corrosion and a solution of one tablespoon of baking soda and 1 cup of water to clean any build-up. Replace the battery with one of the same voltage, 12 volts, if the original is damaged.

Charge the battery fully with a separately powered battery charger.

Reinstall the battery, this time connecting the red cable first and the black cable second. Secure the battery with its holding straps and reinstall Cowling A.


If you are not comfortable servicing a particular system, Yamaha recommends taking the Majesty to a dealer to have it service the vehicle properly.


Battery acid could burn exposed skin and eyes, so wear gloves and goggles while servicing this system. Use only an NGK CR7E spark plug in the scooter to avoid serious engine damage.

Things You'll Need

  • Wrench
  • Oil pan
  • YAMALUBE 10W-40 or SAE 10W-30 engine oil
  • Dry shop cloth
  • Spark plug wrench
  • Wire thickness gauge
  • Spark plug gap tool
  • NGK CR7E replacement spark plug
  • Wire-bristle brush
  • Solution of 1 cup of water mixed with 1 tablespoon of baking soda
  • 12 volt, 8 ampere-hour replacement battery
  • Battery charger
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About the Author

Brianna has been writing professionally since 2009. She has a Bachelor of Fine Arts degree and is excited to be part of a community that contributes to the free sharing of information and ideas.