Roto Start .21 Nitro Engine. Specs:Displacement: 3.45ccBore: 16.3mmStroke: 16.8mmWeight: 350gPorts: 3portsSleeve: ABCCrankshaft Diam: 14mm diameterGlow Plug Type: StandardExhaust: RearCase Material: Aluminum3-Port .21 Nitro RTR Engine (Roto Start)SKU: 21-BN3PD (Roto Start)$145.00PriceQuantity*In Stock / Add to Cart