I was given an SB45 flat bed 17" mower with a Kirby engine years ago. It has been derelict but under cover for some 10 years. Lots of surface rust but everything seems to twist and turn as it should.
I plan to scrap my 35 year old and very tired Morrison 600 and move its 4 year old B&S engine to the SB. The B&S is a 3/4" shaft and the SB is 5/8" shaft with a cast iron engine clutch.
I have searched for a cast iron 3/4" clutch outer without success so am left with two options. 1 - fit a new aluminium cast clutch engine side matched to the cast iron clutch body, or 2 - a new 3/4" clutch assembly.
I am asking for advice on the mixing of the two metals. I would prefer to retain a full cast iron clutch for the rotational mass but I suspect my preference will not count.
If any members have knowledge or experience of this change I will appreciate an answer.
Thank you,
Jim
