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SPUTHE CYLINDER KITS COMPLETE*

 95.4 CUBIC INCH EVO BIG TWIN 

Sputhe’s most popular kit.  The cylinder kit offers the most performance per dollar because the entire displacement increase comes from the increase in the bore size.  RPM potential is not reduced and since Sputhe piston assemblies weigh less than the stock pistons, engine vibration and bearing loads are reduced.

Flat top pistons have valve reliefs for both stock and STD big valve heads.

Oval dish crown pistons maintain squish when using STD, Branch #4 or Revtech Heads.

With oval dish crown pistons
1984 to 1989 compression ratio = 8.6/1 @ 80cc chamber.
Part #4001A

With flat crown pistons relieved for stock and STD heads.
1984 to 1989 compression ratio = 9.6/1 @ 80cc chamber.
1990 to 1994 compression ratio = 8.8/1 @ 90cc chamber.
Part #4001B

104 CUBIC INCH EVO BIG TWIN

For the man who thinks too much is just right.  This kit uses the same stock length Sputhe cylinders as our 95-inch kit.  The difference is the pin location in the piston.  They are to be used with 4 5/8 inch stroke flywheels.

With oval dish crown pistons.
1984 to 1989 compression ratio = 9.0/1 @ 80cc chamber.
1990 to 1994 compression ratio = 8.3/1 @ 90cc chamber.
Part #4003A

With flat crown pistons relieved for stock and STD heads.
1984 to 1989 compression ratio = 10.3/1 @ 80cc chamber.
1990 to 1994 compression ratio = 9.5/1 @ 90cc chamber.
Part #4003B

* Kit includes: 2 cylinders with pistons and ring sets, head and base gaskets, O-rings, wrist pins and snap rings.

Breese, Sputhe Sportster Bonneville
MPG 1300, record holder 1980

Vance Breese
80” Sputhe Sportster 1980

 

E-Mail: sputhe@hotmail.com
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Tel: (530) 268-0887
11185 Lime Kiln Road
Grass Valley, CA 95949-9715

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