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Thanks, for some reason I was thinking the GS acualy had a left over penton 400 engine and the MC was a 420 I guess I could measure the pistions and stoke to check. Also is there any diffrence between the 1979 and 1980 plastic I see DC plastics has a 1980 gs rear fender will this work? thanks

I bought a pair of 1979 KTM 420's ( 1 motocrosser, 1 enduro) from a friend of mine that raced them in the late 70's early 80's in doing some research i found somewhere that the motors might be different in the 2 bikes, is this true? The mx is up and running and I am working on the enduro, it had a frozen bottom end but it appeared it was just varnish as I was able to free it by poring some kerosene into the bottom end other than that it is complete just need some time to put it all back together. Anyway any Info on this bike is welcome.