I'll leave the zokes on because it's totally original, I'm not going to ride it much at all anyway. I'll only replace the grips and realign the stem, D'oh! I'll remove the cranks and give her a thorough cleaning and lubrication.
Oh and a lot of the hex screws are rusting from the Ontario humidity so I'll replace those as well.
I can't find any catalogues from 95, are the 95 frames measured from the bb to top of seat tube like the 94's? If that is true this is an 18. I thought it was a 16 at first because it appears so small.
Yes it's definitely a size 18. Quite a good frame, I'm not sure whether there's any difference at all between a Koa frame and a Muni Mula. But definitely a hardtail frame, you'd need to be a pit bull to ride that with P2s I reckon.
I think Kona have always measured size from centre of bb to top of seat tube, but my impression is that it was exact only from 93 onwards, and prior to that the seat tube was a fraction longer than the size. So for example if your 91 or 92 Explosif has an exact measure of say 20.6, I believe that means it's a size 20. If it has an exact measure of 21.0, then that means that I'm wrong again and it's a size 21 (and therefore 1992).