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These Super Big Bore Kits are designed with close tolerance expansion characteristics for maximum compression and performance. Special thick wall cylinder design 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.Tools you might need: Wrist Pin Tool, Piston Ring Compressor.THESE PISTONS ARE FORGED.