Fuel Economy. A four-stroke machine with the same horsepower can save about 30% more fuel than a two-stroke machine. Gasoline and engine oil. Two-stroke machines are fueled by a mixture of gasoline and engine oil, and two-stroke outboards do not have a special oil filling hole, so they do not need to be filled with oil for lubrication, but are lubricated during combustion. Four-stroke machine fuel is gasoline, the body has a special oil filling hole, you need to add the right amount of oil to do the crankshaft and other gear lubrication, every once in a while you need to remove the waste oil, and refill the new oil of the same type, to ensure the high performance of the machine.
Noise and shaking. The same horsepower of two-stroke than four-stroke outboard noise and power is slightly larger.
Easy to maintain. Because of the simple structure of the two-stroke outboard, the two-stroke outboard is easier to maintain and repair than the four-stroke.
Fuel use. Two-stroke machines use mixed fuel, i.e. gasoline and oil are mixed in proportion. Gasoline: oil = 25:1 during the break-in period. 50:1 after the break-in period. Four-stroke fuel, please use more than 92 gasoline, oil is added separately to the machine oil tank.
Difference between short shaft and long shaft Short shaft. Shaft length 381mm (15 inches) Suitable for boats with transom height up to 44cm(inclusive) Long shaft. Shaft length 508 mm (20 inches) Suitable for boats with transom height between 45 cm (inclusive) and 55 cm (inclusive)
 

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simply the best value for quality portable outboard engines in its class. 
【18HP&2-Strokes】Comparable lubricating system for 2 Stroke outboard engine and vehicle lubricating system,using pressurized circulating oil,make the bearings and components need lubrication direct lubrication,the maximum throttle continuous operation gor more than 20 hours,power attenuation,and fuel consumption does not increase,no abnormal machine.
【Main Parameters】Control System: #93 gasoline; N.W./G.W.(kgs): 38.6/49.5; Bore x Stroke(mm): 56x50; Recommended Propeller range: 3 -9"1/4''x8"; Recommended Lubricant: 2 Stroke Lubricating oil; Mixing ratio: Fuel:oil=50:1; Trim and tilt system: Manual Tilt; Standard fuel tank capacity: 24L.
【CDI Ignition System】Standard CDI ignition system for easy starting and improved performance, it can be partially tilted upwards to sail in shallow water, can work in most water depth conditions.Features 360 degree steering rotation for reverse without gear shifting.
【Water Cooling System & Fuel-Efficient】Water cooling technology to improve the reliability of the whole machine.easy To wear parts are standard parts of gasoline engines, the advanced fuel saving technology make the gasoline consumption is efficient, burning Oil will not fall into the Water.
【 Wide Application 】 2 Stroke 18 HP water-cooled outboard motor suitable in freshwater or saltwater.Perfect math inflatable kayaks,fishing boats,sailboats,small yachts and canoes.

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Product Description

Product Details:
 

Short shaft. Shaft length 381mm (15 inches) Suitable for boats with transom height up to 44cm(inclusive)