Finally got around to opening up the blower I bought. First time inside an M90, and I need opinions on the rotors and casing.
Rotors have a few chips and could stand to be cleaned. Are the chips all that unexpected, and any suggestions on cleaning (if it's really even necessary)? Blower has about 80k miles on it, I think.
Rotors (note the few chips on the ridges):
Rotors turned so you can see the rest:
Inside the blower case: