i'm an engineer and work on many technical engines so i'm so experienced on engines this engine has an Compression Ratio 10/1 its 11,3/1 in suzuki dl650 vstrom it means this engine has a life of more than 100.000 miles and 11,3 means it has 40,000 miles so yamaha has a really bullet proof engine only problem it must be lighter its 183 kg +22lt fuel=its over 200 kg and its far to be a off road machine its an perfect enduro with very good off road abilities and need to have a kick start too strench:bullet proof engine, very quality tranmission system, fuel consumption, very good buit quality weakness:it too high for short users,heavy for off road( but its lighter than its competitors) i dont know who decide this stars to this amazing bike