In the scooter sector with relatively low capacity and high revs, high demands are placed on spark plugs. Overheating with the risk of sticking or fouling of the spark plug are frequent problems with the correct choice of the spark plug. The candles are available with different thermal values ​​(indicated as a figure the code and the different from one manufacturer to another), materials (for example copper, silver, platinum) as well as in some standard unit sizes (which differ in terms of length, diameter and wire). Interference suppressed candles are a good idea with non-interference suppressed candle sockets: the radio frequencies of cell phones, radios, etc. are not affected. They are not recommended with weak ignitions, however. Cooler spark plugs are suitable for racing cylinders and use over long distances. In this context, the thermal audio output of heat to the cylinder head takes place, there is a risk of soot, however. Warmer candles are used in sports and standard cylinders. They reach their operating temperature quickly, but can also overheat. Most scooter spark plugs have a SW M14x1.25 20.8 thread and are either long thread (19mm) or short thread (12.7mm). Please Note: Putting a long thread spark plug into a short thread cylinder head will damage the piston. We only have high quality spark plugs stock from BOSCH, DENSO and NGK in our product range. BOSCH is a German manufacturer, while NGK and DENSO are Japanese. Conclusion: regular exchange / replacement is mandatory. Spare candles belong in each luggage compartment. SIP TPP: a new ignition cable and a new spark plug socket at the same time. All required information on the spark plugs with a description of the thermal value, spark plug designations, resistance to interference and a comparison between the manufacturers is available both at www.sip-scootershop.com and as a download in PDF format. Additional candle types are also provided here.