Motors on Kilby Lake, Montello
says it's a 44acre lake, mean depth of 12ft, max depth 29ft. Many similar lakes of that size that I know of are usually no gas motor, but electrics are allowed. I can't find any WDNR site listing specifics for motor restrictions, probably because those are usually regulated by local municipalities. It does have 1 public boat launch, so either I'd start calling around to find out, or if it's close by you, drive by the launch, there should be a lake-specific regulations sign at the ramp.