Yanmar Marine manufactures engines and drive systems for boats of all sizes. These engines are known for being light weight, having good fuel economy, reliable performance and lower cost than the competition. Captain Rob Smith takes a thorough look at the 6LPA-STP2. This 4.2L engine creates a lot of horsepower in a small package and unlike many engines the 6LPA-STP2 is mechanically operated. To find out why what this means for your overall performance...power up here.