1200cc Conversion Piston Kit for 1986-'16 HD® Sportster® Models - 3-1/2" +.020" BoreThis 883cc to 1200cc conversion piston kit features forged pistons that convert any 883cc or 1100cc engine to 1200cc. Bore the stock 1985 '03 cylinders from 3 inch to 3 1 2" bore. For 2004 '16 models we recommend that new 3 1 2 inch bore cylinders be purchased. No combustion chamber modifications are required due to the dished piston dome. Stock 883 heads produce a reasonable 9. 6: 1 compression ratio. No engine removal, crankcase splitting, or
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