As E74 put it ealier... blah, blah, blah,blah & so on. This really is all too hard and I still believe if it's air cooled, no linkage and drum brake it should be eligible and no scutineer in the world would have any stress. My point is that the rules are grey & fuzzy when you can buy brand new "replica" frames (HL), & shocks etc which have been MUCH improved since the '70's/'80, but can't use a 25 year old air cooled engine design because of one sentence in the rulebook. Which is going to give the most advantage to the average rider, a dirty old big bore 2 stroke engine which most of us can't handle anyway, or a set of adjustable shocks and new improved chassis dynamics? Shocks are classed as consumables, fair enough but frames aren't. I don't believe it's about "cheating" as the cheats will do it no matter what and we probably won't know anyway, but the guy with the big bore evo bike would get called a "cheater" by the rulebook fanatics, which is totally unfair. The rules are strange and ambiguous at best, and the bit about riding them in pre '85 is not right as it is a different "era". DJ you unknowingly opened a big can of worms with the original post and yes it would be a cool bike to build, ride and see at the races, but alas it seems it won't be.
Cheers,K