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PERFORMANCE MOTORCYCLE PARTS AND KITS FOR AMERICAN V-TWINS

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4 3/8" Big Bore Kit for X-Wedge® X128 and X132 engines

 
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Increase the displacement of your X-Wedge engine with these bolt-on cylinder and piston kits. A 1/4" inch bore increase will take an X121 to X128 and an X117 to X132! No changes to the crankcases or flywheels are required. Bolt-on Proven Performance® from S&S!

 

FITMENT

  • S&S X-Wedge® engines

FEATURES AND BENEFITS

  • Bolt-on performance
  • Increase displacement without crankcase modifications
  • Fits all X-Wedge engines

OPTIONS

  • Silver powdercoat, wrinkle black powdercoat or polished finish
x-wedge poston/cylinder upgrade dyno
This dyno chart shows the performance enhancements from increasing displacement. While peak horsepower is not greatly affected, overall torque drastically increases – 140 ft./lb. at 2500 rpm! Both engines are configured with S&S X569 cams, S&S 58mm throttle body, S&S tuned runner intake and custom made 2:1 header system with a performance muffler.

 

Replacement 4 3/8" Bore Cylinders & Pistons
for S&S® X-Wedge® Engines
  X128 X132
Displacement 128" 132"
Stroke 4.25" 4.375"
Bore 4.375" 4.375"
Cylinder Length 4.645" 4.645"
Compression Ratio 10:1 10.3:1
Cylinder Silver Powdercoat 910-0002
Cylinder Black Wrinkle Powdercoat 910-0001
Cylinder Full Polished 910-0003
Replacement  Pistons Forged (for X128) Forged (for X132)
Standard Piston 920-0003 920-0002
+.010 920-0006 920-0004
Cylinder includes one cylinder only. All piston part numbers are for one piston only and include rings, wristpin, and clips. 

 

Replacement Parts for X128 & X132 Pistons
Standard Moly Faced Rings 94-4285X
+.010 Moly Faced Rings 94-4286X
Wristpin 94-9277
Keeper 106-0004

 

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