Hi All Does anyone know what size and pitch the spark plugs in a type 4 1800 engine are, one of mine is quite tight to remove and replace so thought i would try running a tap though it before i stuff the head Rob
M14x1.25 But be careful... Aluminum has a habit of picking up, and you could end up stripping all the thread out of the head
Put some Rocol, grease, wd40, butter/marge, or semen on the tap and if it doesn't wind in easy. STOP. And wind back out. Add more lube.
