The CMR7H is a short cold spark plug, matching engines like, Zenoah Chung Yang, Feulie, Dynamic and comparable. 

The length of the shaft is13 mm. Especially suitable for FG Marder and Baja because of its short length, but fits more engine type specified in each type. This spark plug is more suitable for tuned engines, which have a higher compression ratio. 

This is a colder spark plug, so suitable for standard and tuning motors. When "Carbon Fowling" occurs, (the dark or blackening of the ceramic core), it forms a conductive layer so the spark is not centered, and therefore the engine will not start.

When these problems occur, the alternative Spark Plugs are:

• TPS-CMR6HR
• TPS-CR7HIX
• NGK-CMR6H