S&S Cycle - S&S Performance Parts 2025 L - Volume 67

1999-'06

Phone: 608-627-1497

Performance Kit Specifications For Harley-Davidson® Twin Cam 88®

1 -2017-UP 2 -2007-'17 3 -1999-'06 4 -1984-'99 5 -1936-'84 6 -XL-RA1250 7 -BELTS & GASKETS 8 -TOOLS 9 -WARRANTY 10 -APPENDIX

Compression Ratio

Horsepower Torque

Kit De scription

BORE STROKE

CAM

CNC Heads

Stock Heads

79cc

89cc 91cc

(CNC Heads)

83cc 85cc 87cc 90cc

124" Hot Set Up Kit 106" Stro ker Kit

4 1/8"

4 5/8"

10 9:1 11 4:1* 11 1 10 8:1 11 6:1 11 4:1 11 2:1 10 9:1 640 127

130

3 7/8"

4 1/2"

10 1:1 10 7:1 9 7:1 9 6:1 10 3:1 10 1:1 9 9:1 9 7:1 585

109

115

98" Big Bore Kit 97" Big Bore Kit

3937" 4"

10 4:1 11 1:1 9 9:1 9 7:1 10 6:1 10 3:1 10 1:1 9 8:1 –

3927" 4"

9 7:1 10 3:1 9 3:1 9 1:1 9 8:1 9 6:1 9 5:1 9 2:1 –

103

107

95" Hot Set Up Kit

3 7/8"

4"

9 7:1 10 3:1 9 4:1 9 2-1 9 9:1 9 7:1 9 5:1 9 3:1 570

103

107

*Not Recommended

Performance Kit Contents, Options And Requirements For Harley-Davidson® Twin Cam 88®

Required

Machining

Rejetting Or Calibration Change

Package Contents

Kit Description

Flywheels

Cylinders

rings

Pistons w/ Arms

Rocker

w/covers

Pushrods

Lifters

Cams

Springs

Valve

Heads w/springs

Gaskets

124" Hot Set Up Kit 106" Stroker Kit

      

  











98" Big Bore Kit

 





97" Big Bore Kit 95" Hot Set Up Kit

 





 

  

  



 = Optional  = Order separately  = Bore & hone cylinders  = Crankcase machining for center stud  = Crankcase machining for cylinder spigots

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