i have a spark plug question

[whiteindian01]

would anyone know what type of plug to install in a 1972ish 55hp chrysler outboard? i don't even know where to look for an application for that! thanx!

[Critter]

I have the same motor,when I changed the plugs I just used whatever was on the shelf in the shop.NGK I beleive it was.I know thats pretty vague but these motors are not too picky.

[whiteindian01]

right now i have those stupid rimfire type plug and was wondering if it was the right style

[yamarider]

The rim fire looks like the right one if it's the Magna ignition, here are the Denso plug specs on them:
55HP

Model Year Standard Plug gap (mm)

1981-83 SF-50 0.0
55HP Magna Power Ign.

Model Year Standard Plug Gap (mm)

1969-80 SF-10 0.0
55HP Std. Ign.

Model Year Standard Plug Gap (mm)

1967-76 W20FS-U/TR20 0.8

[05xc7]

ngk BUHX if mag ignition
B6hs if standard ignition

[whiteindian01]

thanx fellas!