I can get my hands on a ktm 504 Mxc 1983 rotax if I want but need some advise or a push.
I've done some web research and found only good stuff about them they are rear only 40 came to oz one thing that makes it more worth it.
I Have read engine parts can be sourced from a few places in the states and in England but not cheap.
The rotax engines are popular in the states in flat track racing and Ron wood is the go to man over there .
They have a rubber belt instead of a timing chain but if it replaced when needed no
Probs.
I found a couple of places that still do
Plastics etc for it .
And the Mxc model has bigger forks , diffrent cam and crank than the GS model.
But the specs on the net says it weighs 156kg ouch not sure if this is right
I still think it would be the best pre 90 four stroke .
What do you guys think , buy it or not ? Then I wouldn't mind a CR250 87 or 88 ?