A 4-cylinder engine has the highest power-to-excess weight ratio of all bike engines but will also has the lowest vibrations and best balance due to the pretty short firing intervals. There are actually distinct configurations of 4-cylinder engines based on the angle between the cylinders: Seat rails: a steel framework https://bike-engines-for-sale48048.suomiblog.com/5-simple-statements-about-bike-engines-for-sale-in-pakistan-explained-50716884