RH's have been raced at title events before haven't they??
Geoff i think the RHs and RN that have been raced at titles upto now have been limited production L and M models and fit into pre 75 / pre 78 legally .
Of course if you unearthed a real factory 74 RH or RN hmmmmmmmmmm depending on the suspension travel ( lets not forget they were improving every week ) you may have to limit the travel
Was there such a thing as a 1974 RA 125 ? i have seen a pic of Akira Watanabe on what looks like a prototype RM 125 M winning the 1974 Japanese championship . I assume this was an RA ? Gastons 75 RA 125 was very different to an RM 125S much more like an RM 125A , but that was raced in 75 so would slot into pre 78 i assume.
Good thread