This configuration is specific to four-stroke engines Because the crankshaft isn’t used while in the intake tract. Having said that, whether this can be a compact price to pay in exchange for firing as soon as each individual other revolution is still left to non-public discretion. 100CC BICYCLE ENGINE KIT: https://bikeenginesexplained48268.is-blog.com/41610084/not-known-factual-statements-about-bike-engines-kit