NAMURA PISTONS Namura Piston Kits. Made to exact OEM specifications. Combine this with the MSO2 (Teflon/Molybdenum blended coat) coating and hard anodizing and Namura gives you higher performance pistons without a higher price. Piston kits come with the piston individually wrapped; a set of OEM quality rings packed in theri own box, wrist pins and circlips. Namura pistons are direct replacements for OEM pistons with no modifications or dimensional adjustments needed.