I have changed plugs in my M103 many times, but I also am getting old enough that my memory is not serving me well.
I remember 10 or 12 years ago Benzmac (Donnie) recommending the Bosch plug and closing the gap a little tighter than the factory spec. I have done that with every plug change since that time and it improved idle quality and general performance. Now, however, I can't remember how tight. I THINK I've set them at .032" but I don't remember for sure.
Even though I'm old, I still have a great memory. Problem is that it's kind of short.
