Help on disney movie name?

I really believe it was the rescuers, but it's not. I think it was a disney movie but here's what I know. This boy mouse and some of his friends were on a mission to find this guy mouse scientist that was kidnapped. Um..all I remember was there was a scene when they were on a clock tower, and it was raining. Erm..made in either the 80's or 90's. I haven't seen it in 10 years, and well..I'd really like to know the name of it