This is not so much a question as a comment on how we fixed our problem. I would like this out there in a good reliable forum

We have a ~10 yr. old Kitchen Aid mixer model KSM90 (300W) that has alway run fast, i.e. speed will not go lower than 2, resulting in "flour shower" when adding ingredients.

Kitchen Aid technical support was of minimal value, except that they did tell us the specs, and indeed the lowest speed was about 50% faster than it should be. Once we were ready to replace it so had nothing to lose, I took it apart.

I was able to adjust the speed so that "1" was finally the speed it should be. It has been that way for about 6 months of steady use, so I think I did the right thing.

The speed regulator is strange; upon opening the unit I expected a rheostat of some sort, but instead it appears as some type of clutch type mechanism (which I doubt it is). The speed lever moves a plate on the back in and out to regulate the speed, and was bottomed out with the lever at "2". There are adjustment screws, so I backed out the plate until the speed was at spec (60 rpm I recall, but do not quote me), tightened the set nuts and put it back together. That was last summer, and it still runs today.

The motor on "1" sounds a little uneven, which bothered me a bit, but I recall my mother's Sunbeam (circa 1965) to sound a bit uneven on low, so I let it go.

Comments or enlightenment would be welcome.