Harley-Davidson Fat Boy Big Bore Kits
Genuine HD big bore kits and aftermarket alternatives that fit the Fat Boy — all years. Select your year for exact fitment and pricing.
Genuine Harley-Davidson (9)
Genuine Harley-Davidson
Screamin' Eagle Stage II Bolt-On Power Kit
92500075A
Genuine Harley-Davidson
Screamin' Eagle 131CI Stage IV Performance Kit
92500095
Genuine Harley-Davidson
Screamin' Eagle Stage IV Kit - 117CI to 131CI
92500146
Genuine Harley-Davidson
Screamin' Eagle Milwaukee-Eight 117 Stage IV Kit
92500073
Genuine Harley-Davidson
Stage II Bolt-On Performance Upgrade Kit
92500058A
Genuine Harley-Davidson
Screamin' Eagle Stage 2 Bolt-On Power Kit
92500074A
Genuine Harley-Davidson
Screamin' Eagle 114CI Stage IV Upgrade Kit
92500062
Genuine Harley-Davidson
Screamin' Eagle Stage 2 Bolt-On Power Kit
92500047A
Genuine Harley-Davidson
Screamin' Eagle 128CI Stage IV Performance Kit
92500094Aftermarket for your Fat Boy
Confirmed to fit your Fat Boy
Aftermarket big bore kits the supplier lists against the Fat Boy. Genuine Harley-Davidson is listed above, not here.
S&S Cycle
S&S BIG BORE GASKETS FOR MILWAUKEE EIGHT
S&S Cycle
S&S 131CI & 136CI BIG BORE STROKER CYLINDERS FOR MILWAUKEE EIGHT
S&S Cycle
S&S 4.32" BIG BORE KITS FOR MILWAUKEE EIGHT
S&S Cycle
S&S 4.32" BIG BORE KITS FOR MILWAUKEE EIGHT
S&S Cycle
S&S 4.32" BIG BORE KITS FOR MILWAUKEE EIGHT
S&S Cycle
S&S 4.32" BIG BORE KITS FOR MILWAUKEE EIGHT
S&S Cycle
S&S 131CI & 136CI BIG BORE STROKER CYLINDERS FOR MILWAUKEE EIGHT
S&S Cycle
S&S 131CI & 136CI BIG BORE STROKER CYLINDERS FOR MILWAUKEE EIGHT
V-Twin
3 5/8" BIG BORE CYLINDERS AND PISTONS FOR EVOLUTION BIG TWIN
V-Twin
3 5/8" BIG BORE CYLINDERS AND PISTONS FOR EVOLUTION BIG TWIN
S&S Cycle
HIGH COMPRESSION 132CI & 136CI BIG BORE KITS
S&S Cycle
S&S 4.32" BIG BORE KITS FOR MILWAUKEE EIGHT