A 4-cylinder engine has the highest power-to-weight ratio of all bike engines but in addition has the lowest vibrations and best harmony due to the very brief firing intervals. You'll find different configurations of four-cylinder engines according to the angle among the cylinders: 100CC BICYCLE ENGINE Package: The 4 stroke https://jaredyltgq.dgbloggers.com/35541969/the-ultimate-guide-to-bike-parts-diagram