Why do you need to replace the belt?? Is it just wear, or has it been damaged in some way?? I've seen these belts still looking good & working well after 200,000 miles, so I'm interested to know what's caused the need here?? :dontknow:
I can't help with any links to vids or instructions, but it really isn't all that difficult. And do please realise that, apart from some different tupperware & the associated issues that might cause with getting the axle out so you can slip the belt past the rear sprocket, it really doesn't matter
WHAT Model, spec, or Year your F3 is, the whole process is almost identical - and IIRC, apart from the tupperware & I think one frame member, it's also very much the same as how you go about getting the belt off of any RT too!! :lecturef_smilie:
So, basically regardless of the Model/Year, the belt is around the front sprocket at that end, and it'll readily slip off once the tupperware is out of the way & the belt's loose enough; then IIRC, the F3's have a frame outrigger that needs to have its rear end undone/unbolted & the other end loosened enough to allow the tube to be moved juuust enough to let the front loop of the belt slip thru the gap; and then it's just left hanging inside the swing arm and around the rear sprocket at the back end, where the rear sprocket is secured into the swing arm by the axle.... so you need to remove the axle to pull the belt out

hyea: (and take the wheel out if you want to make things it easier on yourself - check/replace the tire & brakes while you're there if there's any sign of wear on either - you really don't want to do all this again in a few months!

)
Installation of the new belt is simply the same in reverse, only then you hafta do the tensioning thing! :sour: :thumbup:
If you know which end of a spanner to hang on to and which end to hit things with, then it really isn't all that hard to do - not once you start doing it & step thru the process, anyway.
Good Luck! :cheers: