What is the difference between a z4c and a z8c plug?
Unfortunately we only sell the Z4C spark plug but doing a quick internet search it looks like that Z4C has a heat rating of 4 so I believe the Z8C would have a heat rating of 8. It looks like the higher the number the colder the heat rating. However, as we are a parts-retailer only, we are not technicians and can only advise that this Z4C spark plug is the one compatible with the 80cc 2-Stroke Bicycle Engine.