28.5 OEM Zenaoh Cyl kit. PDF Print $68.00 SKU: ZEN-#2901 This is are new 28.5 OEM Zenaoh Cyl kit. Notify Me Add to Wishlist Add to Compare Back to: Zenoah Marine Engine Parts Description This is the new 29cc OEM Zenaoh Cyl kit.This is a 36mm Bore.this kit has everything to convert your Zenoah or RCMK to a fire burning 29 cc engine. The kit comes with everything in picture.