4RT Spark Plug
NGK park number: CR6EH-9
The standard spark plug for the Montesa Cota 4RT, including the Repsol and 300RR models.
C - Thread Diameter 10mm
R - Resistor Type
6 - Heat range
EH - Partial Thread, Total reach 19mm (3/4"), Total thread 12.7mm (1/2")
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9 - Wide Gap setting 0.9mm (0.035")
Spanner Hex size 16mm (5/8")
