As you can see the plug is 14 mm so I think that the CM6 not go well . My doubts came from the fact that I do not know anything about this Jennfeng spark plug. The other thing is that it has a strange ring compression (I have never seen before) as you can see in the pictures. I know that FTL45 is a very economical engine, it has any instruction manual, poor quality muffler but I decided to buy this engine because the ignition is a good quality and the price ot the total kit is fantastic (only the ignition is about 60 euro). So I'd like to replace the srpak plug with onother quality plug but I do not know what kind of it!