This is an OEM plug cap for the KT100 engine. It's item #11 on the diagram. Besides, it also works well with other engine types. The part number is 82370 - 00 - 00.
Using this Yamaha spark plug boot is easy. First, make sure your engine is turned off. Then, carefully remove the old plug cap and replace it with this new one. It should fit snugly. When installing, be gentle to avoid damaging the boot. As for maintenance, check it regularly for any signs of wear or damage like cracks or burns. If you notice any issues, replace the boot right away. Also, keep it clean and dry to ensure its best performance.
