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These Super Big Bore Kits are designed with close tolerance expansion characteristics for maximum compression and performance. Special cylinder design on the 90.5 and 94mm kits provides greater strength for use with hot fuel blends. Machine type Big Bore Kits have been used by long distance desert cars and drag strip machines. Two-strokes are available to fit 69mm and 82mm cranks. Each set is shipped complete with 4 pistons, ring sets, cylinders, wrist pin and clips. 90.5-94mm Big Bore Kits require machining the cylinder heads and engine case before installation.The 90.5, 92 and 94m Big Bores are designed for competition use and have close tolerance expansion characteristics for maximum compression and performance. Each kit contains: four barrels, pistons and hand fitted wrist pins. The rings supplied with each kit are high performance design. Engine case and heads must be machined to accept Big Bore Kits. CB can perform this service for you; Just make a note that you want machine work done when you make an order.Tools you might need: Wrist Pin Tool, Piston Ring Compressor.THESE PISTONS ARE FORGED.