I actually think the 88 crank will work in the newer motors, 86/87 had a nut holding the gear on the clutch side but the 88 used the same snap ring as 89 and newer. I think I could use a 87 crank in my newer motors it looks to me like it would fit with no problems. I wonder if there was a part number change and in reality they are the same (88 and newer), I have both and they look dimensionaly equal with the only difference being the nut holding the gear on. Not sure though, haven't weighed them to see if there is a difference.