Mercury Marines 4-stroke technology consumes 40 percent less fuel than 2-stroke models for extraordinary value and savings. Engines surpass California Air Resources Board (CARB) 3-Star Rating, making them some of the cleanest running on the market-with 91% less emissions than traditional 2-stroke outboards! The inherent 4-stroke characteristics of ultra-quiet, smoke-free operation, plus smooth idling and running make these engines a natural choice whether youre trolling for fish or out just for fun. Clean running 4-stroke engines from 2.5 to 20hp have a CARB three-star, ultra-low emissions rating. The decompression system and electronic CD ignition design ensure an easy, reliable start. One-stage over-rev protection and low oil pressure warning system provide extra peace of mind. All models are sold with a propeller. Key Features Patented one-piece integrated cylinder block design provides added reliability by eliminating gaskets and fasteners and makes the powerhead much more compact and lightweight Check oil level without removing the cowling with convenient, easy-to-view sight gauge This engine delivers maximum performance with the largest displacement in the 2.5 hp category A twist-grip throttle and 360-degree steering make it easy to use For U.S. shipment ONLY Specifications Engine Type: 4-stroke Full Throttle RPM: 3.5hp: 5,000-6,000; 2.5hp: 4,500-5,500 Exhaust System: Above prop Start: Manual, with decompression system Steering Type: Tiller with 360 turning Gearing: F-N, 2.15:1 Trim Positions: 4 Recommended Fuel: 87% octane / up to 10% ethanol Tank Type: Integral fuel tank Tank Capacity: 0.3gal. Note:These Mercury outboards have 4-stroke engines and, like virtually all 4-stroke engines, depend on oil in their crankcases for lubrication. To prevent the oil from leaking during transport, the engines are not shipped with oil in their crankcases. You must put the correct amount and grade of oil in the crankcase prior to the first