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WISECO BIG BORE PISTON KITS WITH GASKETS FOR TWIN CAM

Wiseco Big Bore Pistons are forged from hi-silicon aluminum alloy for superior strength and dependability.
The unique piston shape allows tight piston to wall clearances for quieter operation.
Grooves are machined around the top ring lands to reduce detonation and improve the sealing power of the top ring.
Designed for Stock stroke flywheels only.
All wrist pin holes are ream fit for a perfect geometrical surface.
Enlarged valve pockets provide the clearance for larger valves and high lift cams but must be checked.
Includes Instructions and clearance recommendations.
All Piston Kits include Cometic brand gasket sets.

Made in U.S.A. Prices include FREE SHIPPING*

Fit Twin Cam 1999/Later 1550cc (95ci):

KEITH BLACK PERFORMANCE PISTON KITS FOR BIG TWIN

KB Big Bore and Stroker Piston Kits

Evolution is the key word as these Keith Black Performance Piston Kits were spawned from this successful manufacturer's line of automotive pistons. Machined in the USA, these lightweight permanent mold cast pistons are manufactured from Hypereutectic 390 Alloy, contain 16-18% silicon, and are heat treated to T-6 specifications producing a stronger than stock piston. This special alloy keeps heat confined to the combustion chamber and reduces heat transfer to the piston itself. The result is a cooler running piston that can be fitted with a clearance as small as .00075". Piston expansion is reduced by as much as 20% over conventional pistons. These tighter fitting pistons rock less, support the rings better, are more durable and retain compression better for maximum power. The key feature to these pistons is the accumulator groove between the top and second ring. This groove between the rings tends to average the normal pressure between the first and second ring, keeping the pressure low enough to prevent lifting of the top ring while maintaining preload on the second (oil scraping) ring. Each set of pistons include: wrist pins, spiral locks, engine assembly lube, and Hastings Moly rings. All wrist pins are .792" O.D. Sold in pairs. Prices include free shipping*.

Part#MU62422 - Big Bore & Stroker Piston Kit. Big Twin Evolution. 88ci-3.625" 10:1 Flat Top Piston (4.25" stroke). +.040" Bore ...$209.54

BIG BORE KIT FOR EVOLUTION SPORTSTER 883cc, 1100cc to 1200cc

More horsepower for your 883cc or 1100cc Sportster. This kit makes it easy to give your 883cc or 1100cc a larger displacement by boring the stock cylinders and installing the pistons in our kit. 883cc requires head combustion chamber modification to reduce compression ratio to a workable level of approximately 9.5 to 1. This is achieved with a hand grinder - no expensive machining is needed. On 1100cc no head work is required. The end result is a 1200cc Sportster. In the kit is a complete set of instruction, including use of template for head work on 883cc. Fits 1986/1990. For 1991/2003 also purchase MU64419 rocker cover gasket kit(below).

Part#:MU60130 (Rpls. HD 16140-87 & 25628-80) ... $148.43 including free shipping*

ROCKER ARM COVER GASKET SETS FOR SPORTSTER EVOLUTION - 1991/2003
The finest quality gasket set available from a premium gasket manufacturer in the USA. Contains molded cover gaskets. Use with pushrod seal kit MU64803 if needed. 1991/2003. Part#:MU64419 ... $31.60 - MUST BE PURCHASED WITH BIG BORE KIT OR OTHER MU# ITEM, ships free with kit.