- Stock #407852 - Great Deck Boat - up to 12 people! Mercruiser 4.5L - 200hp engine! Fun on the Water! Looking for an affordable deck boat that can accommodate up to 12 people? Look no further. This StarStep 221 IO is powered by the Mercruiser 4.5L engine and the Mercruiser Alpha One Outdrive. The engine delivers up to 200 hp of fun on the water! This boat is in good condition and ready to hit the water. The layout is great for a family fun day at the lake! There are lounge options at the rear sun pad, an aft-facing bench seat, or the lounge seat in the cockpit opposite the helm. There ... read more