ULTIMA Diamond Cut Competition Series Big Bore 131 C.I. Engine with Chrome & Natural Finish

(Diamond cut pictured below)

ULTIMA aftermarket motorcycle parts are designed to fit Harley's with no modifications.


  • ULTIMA Competition Series Big Bore 131" Engine with Chrome & Natural Finish
  • ULTIMA R2 Polished Performance Carburetor (does not come with Mikuni Carburetor)
  • ULTIMA Chrome Performance Air Cleaner Kit
  • ULTIMA Engraved Chrome Domed Points Cover
  • Wild Rider Single Fire Ignition
  • MSO (Manufacturer's Statement of Origin) and Warranty
  • 150 Horsepower @5500 RPM
  • 151 LB FT Torque
  • 4.25” Bore & 4.625” Stroke
  • 10.4:1 Compression Ratio
  • Flat Top Mahle Pistons
  • ULTIMA .626 Lift Cam
  • 268 Duration on Intake
  • 272 Duration on Exhaust
  • 0.125" Taller Than Stock Evo Engine
  • Notice: This engine is FACTORY ASSEMBLED
  • ULTIMA RECENTLY CAME OUT WITH THE 131” BIG BORE COMPETITION SERIES ENGINE THAT IS IN STOCK AND THE SAME HEIGHT AS THE ULTIMA EL BRUTO 127” COMPETITION SERIES MOTOR. The ULTIMA 131” motor comes with a 6 month / 6,000 mile limited warranty. ULTIMA Engines bolt directly into Evolution style frames using your motorcycle’s existing mounting hardware, and they are compatible with your motorcycle’s stock driveline components.