I used a socket...it worked fine. ------------------ '99 WZ with all YZ mods, de-octopused, FMF PowerBomb header, Stroker SX-1 silencer, SS front brake line, forked over by Pro-Action, OEM YZ tank, IMS YZ seat, carb mods by Jim Dean and Sir "Taffy" from Jolly Old England, AMA, NESC. I did Before I put the piston in. They were all in spec. However I didnt check the valves after I got everything back together. I dont see how they could have changed by just putting a piston in and mew cam chain, unless they changed sue ti the new piston, rings, cam chain and removing the cam shafts. I will check the valve clearence on both Intake and Exhaust tomorrow.