I recently bought a boat with aq225e engine. I need new spark plugs and bought some champion rv15yc4, which it says is the plug on any site. When taking out the old plug it was a ac r43t which is a lot shorter from end where hits block to the end of the plug by like an 1/8 of an inch. My manual also says ac43mt. I am not sure what to do because I don't want it to be to long and the piston or valve whatever is in there to hit it. Can anyone tell me what to do or if you have an aq225 what plugs you use?
Thanks
Thanks