Custom Chopper Engines
Our Ultima Motorworks 49 State EPA certified engines come complete with a special EPA configured camshaft, carburetor and ignition system with all settings preset from our factory. All engines come with a 2 year 24,000 mile limited warranty.
Mad Fox Choppers uses the Eltima 49 State EPA Certified 107 C.I. or Ultima El Bruto Series Big Bore Engine with 113 C.I. with 120 HP and 125 LB FT Torque with our custom choppers. Each engine is available in Natural Finish, Black Finish or Polished Finish to suit your styling needs. Engine specifications found below, simply select your engine when ordering.
| Ultima EPA Certified 107 C.I. | Ultima El Bruto Series 113 C.I. |
| Bore: 4.000" | Bore: 4.000" |
| Stroke: 4.250" | Stroke: 4.500" |
| Piston: Forged Dome | Piston: Forged Dome |
| Compression: 9.6:1 | Compression: 10.2:1 |
| Valve Spring: Ultima® | Rated Output: 120 RW HP |
| Chrome Nose Cone/Rocker Boxes | 120 LB FT Torque |
| Billet Oil Pump | Camshaft: 0.640" Lift; 264 Duration |
| Chrome Tappet Blocks | Valve Spring: Ultima |
| Single-fire Ignition | Chrome Nose Cone/Rocker Boxes |
| Includes 45mm Mikuni Carb. | Billet Oil Pump |
| 2 Year/24,000 Mile Limited Warranty | Chrome Tappet Blocks |
| *Included in basic build* | Single Fire Ignition |
| Includes 45mm Mikuni Carb. | |
| 12 mo/12,000 Mile Limited Warranty | |
| *Available at additional cost* |
For more information on the Ultima Engines, click here
Black Finish Engine
Natural Finish Engine
Polished Finish Engine
