I've just seen a picture of a bike with a BSA heavyweight single a la M20 bottom & a Harley Ironhead Sportster top end.
Does anyone know of this being done before? Can't post a picture I'm afraid. I've always thought the older Sportster top ends had a remarkably Big Single look.
Yes it's been done before...I've seen two others and there may have been more at various times...I've also seen a Matchless OHV top end on an M20 and of course there's the Italian Gruppo Velox OHV conversions...Ian
