hi all,yes indeed 231901 425 1/2"x5/16" roller .312" ,is the correct chain,incorrect is 428 1/2"x5/16" roller -335" ,took some sorting as the chains passed to me over the counter were packed in cardboard packets and I only found they wouldn't fit after getting home and unpacking,and that was the salesman and spare parts guy saying yes yes that's the correct chain,I only asked on here for type and links as the old chain was caked in grease and i didn't want to slam that on there bench for them to work out.So the first chain i kept afterall and it went on the steering,turns out the rear chain was a 428,which was wrong anyway,425 is correct.They have now discovered there is a model with a differential after all,well before there time I expect,anyway the the Honda is purring like a kitten,belts tightened and clutch adjusted she's a beauty smile
Thanks AVB!you got it right.