Motorcycle Cylinder Head Base Seal 66mm Standard 1988-1991 Works for Fit For 3ET DT200R 1988-1991 standard 66mm bore two stroke motorcycle engine Direct end assembly fit,aligns bolt holes fluid passages,no extra Tight sealing ,maintains stable cylinder compression during trail riding Compressed gasket sheets,hardened piston rings, cut molding Standard 66mm inner bore dimension,consistent ring thickness matching specs