Honda Express with 21mm Dellorto PHBG

[ststeven11]

Does anyone know of a stock moped throttle cable that will work unmodified on a '79 Honda Express NC50 with a Dellorto PHBG? The stock inner cable does not protrude from the outer housing enough to work. I know I can cut the outer tube and put a new cap on, but I'd rather just used another cable. Any help would be much appreciated.