ORIGINAL: gaRCfield
How does an OS F plug fit into the mix? They claim it's for four strokes, but I found that many guys are using them on big two strokes; I tried it and my engine is running better. Is it longer and hotter than an 8?
It is not inherently hotter than the "8", but because of the slightly longer length ( more metal ) it does retain heat a bit better.
It also tends to keep the coil out of the fuel, especially in inverted engines. It also ever so slightly raises the compression too.
Many two stroke engines of .46 size and up now come with longer plugs very similiar to the "F" plug and do run better with them.