1991 TO PRESENT Sportster and Buells *


Sputhe cylinders are cast in 383 aluminum alloy, with a tensile strength of 45,000 p.s.i.  The aluminum is injected into a steel die at over 5,000 p.s.i., assuring perfect bonding to the sleeve.  Lascomite is a “class 40” high tensile chrome-moly alloy having a high molecular pearlite structure.  It is centrifugally spun cast and heat treated to a hardness of 200 Brinell.  Not only is Lascomite harder than the cast iron that Harley-Davidson and the other after-market cylinder manufacturers use, it is much tougher and less brittle.  The Lascomite sleeve in the Sputhe cylinder is 60% thicker than the sleeve in the stock Evo cylinder for increased rigidity.

The 3.780” (96mm) bore Sputhe cylinders have greater fin area and a symmetrical fin pattern that reduces thermal distortion and allows sustained operation at maximum power.  Sputhe cylinders are stock height so that the cylinder studs, pushrods, exhaust pipes, manifold and motor mounts do not need to be modified.  Heads and cylinders can be removed with the engine in the frame.

*except Buell XB-9

Part #4008A Dish Top Pistons $
Part #4008B Flat Top Pistons $

E-Mail: sputhe@hotmail.com

Tel: (530) 268-0887
11185 Lime Kiln Road
Grass Valley, CA 95949-9715

SputheEngineering name, design and related marks are trademarks of  SputheEngineering, Inc.
SputheEngineering, Inc. ©1997-2013.  All Rights Reserved.