Driven Kawasaki Ninja 400 18-23 520 Front Sprocket

Build is very nice, always go steel over aluminum for sprocket. Must know that even a 13t front sprocket will trip an "Error 25" on a Ninja 400, but there's a simple fix you can find on forums.

Game changer for the quarter mile. Trying to get 10 seconds outta my little ninja 400. This brings me closer

Very good seller, very quick shipping,l was very satisfied

Exactly as advertised great fit and look!

Works great.

This is an initial review, I have only installed it recently and given it a 2 hour test ride with a mix of in town and Interstate. This change from the stock 14 tooth really helps Ninja 400 surge, but it does gear it lower so your top speed at redline in 6th drop to about 100 mph. However, I don't know the actual speeds the bike is travelling because it's already off from factory. The stock indication in 6th was about 50mph at 5k rpms, 60 at 6k, 70 at 7k and so on. It semed closer to 8k at 70 after the 13 tooth was installed. Because of the change, a common problem for the Kawasaki anyways is an engine light and code for the gear position sensor. The bike senses the speed and rpms don't match the ECU program, but it does continue to indicate the same speeds and rpms the 14 tooth has. Now you have the engine light, fault code and the gear position on the dashed out and blinking. A speed healer will correct the speed and odomter, but without an ECU correction reflash that is NOT yet available the engine light will stay on and the gear indication stays dashed out and blinking. The gas mileage is still good, but I don't recommend this 13 tooth change for Interstate or freeway commuting.