Vicquote at 67 Johnston St Fitzroy is great and reasonably priced. 9419 4601
Older guy did both mine.
My always-go-to guys are PMP Motors, 388 St Georges Road, Thornbury (inner city to me...).
Italian brothers run a small but respected family car repair shop.
They are Scooter friendly and know their bikes and scooters well—and are always happy to RWC additions to my collection. Accomodating, sensible and friendly.