125 (HP) 1989A-1989E piston# F691015
125LD (HP) 1989A-1989B piston# F694015
Both have the same diameter 3-5/16 & used in 3.3125 bore
Both use the same rings
The only difference I see, (on the F694015) the spacing between the top ring & bottom ring is slightly wider.
Could this have any...