ProTaper – ProTaper Front Sprockets - Yamaha, including 12, 13, 14 and 15 tooth countershaft sprockets for YZ and YZF models, YFZ450 and Raptor 700 quads, and shared Yamaha/Kawasaki fitments, handles two very different jobs. On a YZ or YZF motocross bike, a one-tooth change at the countershaft reshapes the whole powerband, so a 13 tooth sprocket tightens up corner exits on a stadium-style track while a 15 lets the engine breathe on fast national layouts. On a YFZ450 or Raptor 700, gearing decides how a heavy quad launches and how hard the chain works, and the 13 and 14 tooth options give you a real choice between drive and top speed. Multi-fit Yamaha/Kawasaki and Suzuki/Yamaha patterns from 12 to 15 teeth widen coverage across mini and full-size machines. Every sprocket is hardened steel with a tooth form machined to keep the chain rollers seated squarely, which reduces noise, cuts vibration through the footpegs, and slows wear on the chain and rear sprocket. Because a countershaft swap takes minutes, it remains the most efficient tuning move available. Fresh ProTaper gearing sharpens acceleration and makes power easier to use.