Motorcycle Cylinder Head Base Seal 67mm Oversize 1988-1991 Fit For Yamaha DT200R 3ET 1988-1991 67mm bore +100 oversize motorcycle piston ring cylinder head base gasket kits set Custom sized +100 oversize piston rings match 67mm cylinder without grinding or Integrated cylinder head base gaskets block leakage stabilize compression for offroad trail riding Hardened anti-friction piston rings reduce oil consumption slow cylinder wall abrasion under RPM compressed gaskets maintain tight seal under frequent temperature two-stroke operation Complete all-in-one kit covers full end rebuild, combining sealing rings matched gaskets for one-stop repair