Should the 2021 Ninja 400 change the sprocket?
2 Answers
Whether to change the sprocket on the 2021 Ninja 400 depends on personal circumstances. Here is the relevant introduction: Motorcycle: A motorcycle is a two- or three-wheeled vehicle powered by a gasoline engine and steered by handlebars to control the front wheel. It is lightweight, flexible, fast, and widely used for patrol, passenger and cargo transportation, as well as a sports equipment. Broadly speaking, motorcycles are divided into street bikes, road racing motorcycles, off-road motorcycles, cruisers, touring bikes, etc. Future development: After a century of evolution, motorcycles are developing towards being newer, faster, and safer; the modern motorcycle industry has introduced a large number of advanced technologies. For example, the FLHRC-1 motorcycle launched by Harley-Davidson in 1998 adopted the world's top automotive engine technology—fuel injection devices, which not only improved power performance but also better met the environmental requirements of contemporary society, making it a pioneer of 21st-century motorcycles.
As a daily track enthusiast, I recommend considering the usage scenario when modifying the Ninja400's sprockets. The stock 15/35 gear ratio is conservatively designed, making acceleration sluggish. For frequent city commuting, switching to a 14-tooth front sprocket improves low-end torque response by 15%, noticeably enhancing traffic light take-offs, though it raises RPM by about 500 at 110km/h. For mountain runs or track days, the 14/42 golden combo delivers the most balanced performance, significantly boosting pull in gears 1-3 and reducing the need for downshifts during corner exits. Note that smaller front sprockets may cause chain guide wear, so upgrading to a 520-spec chain is advisable to reduce load.
