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JTR859.42 Yamaha FZR750, FJ1100; 42 Teeth Rear Sprocket Location: upstairs:Location: upstairs RV50 1973-1981JTR859. 42; 42T Rear Sprocket Fits: Yamaha Road FZR750 RT Genesis 1988 1989 FJ1100 L,N,CN,CL USA 1984 1985 JT Sprockets is the world's leading manufacturer of aftermarket sprockets, constantly raising the industry's standards for quality and service. We are committed to supplying the most durable, best quality sprocket available in the marketplace worldwide. This is why we produce and sell more sprockets than all the other aftermarket brands combined.