1971 AT1 and CT1 parts interchange?

[hd50el]

Hi, I am new to this forum, and have a question that I hope someone can answer for me. What parts interchange between a 1971 AT1, and a 1971 CT1? Any and all help is appreciated. Thanks,

John C. Smith

[ossagp]

The transmissions were pretty much the same,,the bore is different,,the strokes the same. At least some of the AT-1's that came with lights had an electric starter. I didnt see a CT1 with an electric. Now all this assuming that I am remembering the CT1 as a 175. Those little engines were essentially half of the YD road racer engine,,the 250 and the 350, dimensionally. You could port each cylinder(The at or ct) to those specs(the roadracer's), build a pipe to match and run down some pretty fast machinery for its day.

[TerryW]

Gidday there; I was wondering about the AT and CT; do you know if they are the same as an AG? I have seen references to AT and CT in workshop manuals and wondered if they were the same as an AG175 (Of which I have a 1974 with clutch woes outlined a couple of posts before yours...)