I've a 91 trx300fw I use on my farm. I've never had an owner's manual. They are unavailable from Honda or Helm (the publisher) I've been looking for several years now, and even e-bay has never listed a 91 om. Everything else of course. My question: Is a 90 or 92 close enough to be useful? At what point are the engines/drivetrains, wiring etc different enough or maybe I should say is there another year that would work for me, like a 90 or 92? I have a factory shop manual but that really doesn't cover routine maintenance etc etc. Thanks I know there are significant differences because I've been trying to find a front wheel drive disconnect, Warn 424, and have been told only the early 90s unit would fit.