Replacement Spark Plug & Other Routine Parts?
I recommend You locate the local motorcycle/scooter and bicycle shops. The motorcycle shops should have the right spark plug for your engine. The instructions recommended replacement spark plug model# NGKB5HS. For my personal preference if you have a motor with a vertical standing sparkplug I recommend the model# NGKBP5HS. I’ve have personally noticed improved performance from this sparkplug alone. If you decide to use a different spark plug you need to be very careful and know what you are doing or you could damage the engine. The bicycle shops will have other things you will need throughout the life of the motorized bicycle that are more bicycle related.