The CMR6H is a short hot spark plug with M10 thread, like, Zenoah, Chung Yang, Feulie, Dynamic and comparable. 

The length of the shaft is 13 mm. Especially suitable for o.a.de FG Marder and Baja due to the low overall height, but fits in any further indicated engine type. The most suitable for standard motors with a standard clutch. 

Because this spark plug gives a brighter spark there will be less, "Carbon Fowling", in other words, less blackening the ceramic core. This black forms a conductive layer, outside of the engine a normal spark, but under combustion pressure no spark in the center poit, and therefore the motor will not start.