Welcome to the forums. Here is a link for a repair manual for the Fourtrax 300. You'll need to look in the maintenance section. Sorry, I don't have a manual for the 420 Rancher.
Download 1995-2000 Honda Fourtrax 300 Repair Manual.pdf for free on uploading.com
Download 1995-2000 Honda Fourtrax 300 Repair Manual.pdf for free on uploading.com