How do i know when seals in the engine need replacing? i am doing a teardown of the engine right now so i thought i might as well replace what i can while i have it out and apart, how do i tell if i need new seals and what are the most important seals to get replaced when doing a full teardown. the machine has been out in the weather for 6 or so years and never ran the best before then either, where would i even get stuff like engine seals for an older machine like this? 1987 Suzuki lt 125H.