Kitchenaid Speed 2 too fast, can't adjust it

Usually, replacement is not required.

#1. DISCONNECT FROM MAINS and undo the single screw at the top of the rear cover. The black plate being held in the picture above bears the 3 adjustment screws, which are secured by locknuts.

#2. To decrease the slowest speed, loosen the locknuts of the two upper screws and tighten the screws symmetrically, so the top edge of the black plate stays parallel to the case. The nominal free length of the screws plus nut is 10mm for 60 rpm, but you may have to reduce this.

#3. Replace the rear cover and screw, reconnect to mains and see what the minimum speed is now and DISCONNECT FROM MAINS AGAIN. If it is slow enough, TIGHTEN ALL 3 LOCKNUTS while keeping the screws from turning (loose locknuts are the probable reason for the trouble in the first place), replace the cover and retaining screw and then do a last check.

#4. If it is still not slow enough, go back to #2.

#5. Adjust the lower screw only if the top speed is wrong - after correcting the lowest speed.

It does sound as if the control board needs adjustment. Try downloading the following Service Manual which actually applies to the Artisan although it does not say so:

++http://www.kitchenaidparts.eu/documents/...

My antivirus software shrieks at me when I try to access this URL

There are three schrews, 2 on the upper side of th speed control plate and one below. They can be adjusted. Check at the rotor , greasing in the coilspring could be dry.

I had some issue on this before, but lubricating the coil at the rotor to the speed control plate and fine adjustment of the three schrews allow me to adjust the speed again