As an Amazon Associate, we earn from qualifying purchases. OS Engines Cylinder Assembly Rebuild Kit :21XZ-R Speed | Horizon Hobby OS Engines . OSMG4802 Gallery Attributes Brand name, Manufacturer name, ManufacturerOS Engines Extra Product NameOS Engines Cylinder Assembly Rebuild Kit :21XZ-R Speed | Horizon Hobby moq, multiple, tierMinQty11 MPNOSMG4802 qtyInStock0 SKU22013020 tierPrice1249.99 Distributor offers SellerSKUMOQIn stockMultiplePrices horizonhobby.com22013020111 @ $249.99