2000-2011 YAMAHA TTR 125 UNI AIR FILTER YAMAHA DIRT BIKE, Manufacturer: UNI FILTER, Manufacturer Part Number: NU-3242ST-AD, Stock Photo - Actual parts may vary. Multi-stage competition off-road air filters. Traps dirt and dust in two layers of foam, the large pore pre-filter captures the bigger particles. The small pore inner filter prevents any engine wrecking grit from reaching the cylinder.