Hepolite and JCC piston rings are a full 1/16" thick. The weight of those heavy rings and friction from high piston speed causes the ring lands to pound out. After about 30,000 miles the ring lands get sloppy and your bike starts smoking. See Jimbos post - Why are my AE piston ring land clearances so large at .006"? Same thing has happened to me in the past - .005 to .006" ring land clearance with hepolite pistons after 40,000 miles. I'm not seeing this happen with pistons using the lighter thinner .040" top rings (JE, Wiseco, Wossner, Ross etc).