You are correct. I have never used an NGK in anything other than a
two-stroke engine, and then only when it is the recommended plug.
Chuck Rothfuss wrote:
> Gotto be careful there, NGK heat ranges are backwards from most others, 2
> being the hottest and 11 the coldest. Could be a serious tuning headache if
> you start switching brands with NGK.
> Chuck Rothfuss
> >John Beckett wrote:
> >> Anybody have an old Accel spark plug cross reference guide?
> >> I have some old ACC7ES, ACC8ES and ACC9ES plugs, trying to figure the heat
> >> ranges.
> >> John Beckett