KB PERFORMANCE PISTON SET +.030

883-1200 conversion forged piston set. 10.1 CR with 51cc head. Works with unmodified 883 heads. Piston weight 337gr. Piston pin weight 97gr. Piston pin dia. .791" / offset. Head type: Dish with +9.8cc. Compression height 1.280". Bore 3.498". Stroke 3.812". Rod length 6.926". Cyl. length 4.650". All KB forged pistons are made from 4032 alloy; a 11% silicon alloy that is formed in a forging press. Forging aluminum gives a superior strength and structural integrity on a molecular level; after which it is fully machined. The combination of this alloy and the forging process allows the piston to flex under detonation; or pre-ignition; giving the best resistance to cracking. Although 4032 has a low expansion rate; it is higher than the cast Hypereutectic. Therefore forged KB pistons will require about .001" wider piston to wall clearance. Pistons are sold as sets; complete with wrist pin retaining rings; wrist pins and piston rings. Please note that all KB forged pistons come equipped with offset wrist pins / piston pins. There is a front and rear section on the piston and it is necessary to install it in the correct way. Please refer to the installation instructions; as provided with each piston set; prior to installation. Note: For 04-up XL models 1200cc cylinders must be used. The stock 04-up 883 cylinder liners are too thin for boring to 1200 size.