Rotax 447 - 1.65mm (.074in.) BTDC measured vertically
Rotax 503 - 1.73mm (.069in.) measured at a 30 degree angle
Rotax 582 - 1.95mm (.078in.) BTDC measured at an 18 degree angle
Rotax 618 - 1.48mm (.059in.) measured at an 18 degree angle

 

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