PSA: keep an eye on your front sprocket. It wears way faster than your chain and rear sprocket. A worn front sprocket ruins your chain in no time. (x-post /r/motobe) : r/motorcycles
Supersprox Front Sprocket 12T for Kawasaki KLX 400 R 03
Supersprox Front Steel Sprocket - CST-1443-13-1 Dirt Bike Motorcycle - Dennis Kirk