Hey guys not sure if this has been covered or not but I just picked up a new JE piston from Xr's Only spec'ed at 103mm 10.5:1 and... I have a question about its compression hight. When compared to the piston that came out of the bike (Wiesco 102.4mm 10.25:1) the new piston has the wrist pin about 3 mm lower in the piston than the old. Now I know that the XR600 had a shorter stroke with a taller compression height and the XR650L gained its stroke by moving the pin in the piston closer to the dome. Is it possible that I have a piston for the XR600 and if I do will that 3mm of extra height cause the piston to make contact with the head. I would check this myself but to really see where everything is going to sit I will need to get it all assembled and that includes a bore. If I have confused everyone I will try to get some pictures later today.