Re: Spark Plugs

Posted by Randy Berger On 2011/9/7 14:20:17

I was going by the parts book which says the N8 (or the H10) is for the 5540 and the N18 for all 56th. I always thought the N18 had a much longer reach (3/4 threaded portion) than the H10 (7/16). Today is a good day - I learned something.