Ivan, have you got (or can you take ) the measurement from the crank web to the end of the 'stub' on the stator side for both the xl and xr cranks? The xl crank i have is from an electric start model and i believe this is longer still :eek1 It is approx 84mm the one i have! I am now toying with having this xl crank machined to the xr500 profile and using the xr engine cases. Maybe the whole stator side and use original size xr bearings or just get it shortened and use a modified bearing from list (40x80x18 iirc) on the xl sizing. I got lost on the balance bearing side of things, not sure if it was this thread or another, but are the counter balance bearings the same on both the xl and xr? btw carillo still have the 83/84 xr500 spec conrod on their database The only problem is no-one seems to have any big end roller bearings or thrustwashers seems they are an odd honda size. Surprise surprise!