IKON and KONI is the same brand, they used to be based in the Netherlands (KONI), and are now in Australia or New zealand. not exactly sure, but down under somewhere, as IKON. they have good customer service, but the spares for the shocks from the seventies are getting rare.
I rebuilt my KONIs, its fairly simple, as long as you get the top nut off, which can be a b*tch to remove. then its all about cleaning the old oil out, cleaning the disintegrated bump stop out (mostly the culprit in stiff KONIS: the debris clog the oil passages in the damping rod piston) and filling with proper fork oil. Once you know how to do it, getting 'new' shocks is cheap, as lots of KONIs suffer from the decayed bump stop syndrome.
All KONIS can be adjusted (to my knowledge), some conveniently with a dial on top, the rest with removing the coil, pushing the damping rod all the way down, and twist it in quarter turns.
If you want to see whether your original Honda shocks are still damping, remove the spring, and compress the damper (compressing should be effortless-ish, expanding should be... dampened). there is a trick to safely remove the spring collar, but it only works on shocks without the chrome cover. but i too would replace old shocks. Not on my 125cc Hondas i putter around, but on bigger machines for serious driving.
