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Tauer Machine LLC., manufactures primary drives for Harley Davidson™ and custom motorcycles. TM produces it's own pulleys and clutches. The pulleys are made from billet 6061-t6 aluminum. with Kevlar fiber clutches. These high quality components will give you years of performance. TM also has a patent pending primary drive integrated oil cooler which reduces the engine oil temperatures by about 25-35 degrees Farenheit. All big inch motors need an oil cooler and with TM's unique design, the oil cooler is completely hidden in the outer primary cover, eliminating the need for an ugly, frame mounted oil cooler.  

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