"focuses on the new generation of high revving single cylinder 4 strokes and 2 strokes. SC4 Racing offers all of the services that you need to keep your engine running at top performance like valve seat cutting and replacement, crank building, cylinder honing & plating, clutch & transmission overhaul, and complete engine rebuilds. We also sell the parts that you need…. Valves, valve springs, cams, pistons, and much more from top suppliers and motorcycle manufactures.