Genuine HD big bore kits and aftermarket alternatives that fit the Fat Boy 114 — all years. Select your year for exact fitment and pricing.
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 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 big bore kits the supplier lists against the Fat Boy 114. Genuine Harley-Davidson is listed above, not here.
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
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
S&S 4.32" BIG BORE KITS FOR MILWAUKEE EIGHT
S&S Cycle
S&S BIG BORE KITS FOR MILWAUKEE EIGHT
This category contains different levels of engine work. A shared Stage name does not mean the same starting displacement, cylinder heads, camshaft or calibration. Compare the exact kit contents with your existing engine and the riding character you want.
Select your year before choosing a kit. The 117-to-131 film applies to 92500146, not every 131-labelled or Stage IV product in this all-years grid.
The catalogue also places Stage II Bolt-On Power Kit 92500075A here. Its description specifies opening the cam chest and a power delivery aimed at the middle and upper rev range. Do not read the category name as a promise that this kit includes larger cylinders or the complete Stage IV combination. Use its own parts list and installation requirements when planning the work.