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for Harley-Davidson© & American Custom Motorcycles

Wiseco Big Pore Piston Kits with Gaskets for Twin Cam.

Big Bore Piston Kits


Piston Kit.


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

Compression Ratio Bore Size Part # Price Buy Now
9:1 Standard M62236 $508.64
9:1 +.005" O.S. M62237 $508.64
9:1 +.010" O.S. M62238 $508.64
10.5:1 Standard M62233 $508.64
10.5:1 +.005" O.S. M62234 $508.64

KB (keith black) Big Bore and Stroker Piston Kits for Big Twin Evolution.











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.

Part#: M62441 - Big Bore & Stroker Piston Kit. Big Twin Evolution. 93ci-98ci-3.625" 10:1 Flat Top Piston (4.625"-4.750" Stroke). Standard Bore... $213.23


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PLEASE NOTE: We Do NOT Backorder. If your item is not in stock, you will be notified and given a refund.

FLAT RATE SHIPPING APPLIES IN CONTINTENTAL 48 UNITED STATES ONLY. AK, HI and APO/FPO will have additional shipping fees. We ship within the U.S.A. and to APO/FPO (military addresses; weight and size restrictions apply.). We do not accept foreign credit cards. Please see our CONTACT page for more information.

Prefer to call in your order to Steel Thunder? Call 603-237-8200.


Please note that all prices are subject to change.


Steel Thunder Custom Cycles

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Columbia, NH 03576

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