ULTIMA Competition Series Big Bore 131 Cubic Inch Engine with Chrome & Natural Finish, Polished Drag Race Style Primary Belt Drive with Outboard Support, Chrome & Cast 6-Speed Left Side Drive Transmission, 2.0 kW Chrome Starter

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


  • ULTIMA El Bruto 131" Engine with Chrome & Natural Finish (Diamond Cut available!)
  • ULTIMA Polished Drag Race Style Primary Belt Drive with Outboard Support
  • ULTIMA Chrome & Polished 6-Speed LSD Transmission (5 Spd and RSD available!)
  • ULTIMA R2 Polished Performance Carburetor (does not come with Mikuni Carburetor)
  • ULTIMA Thunderfire 2.0 kW Chrome Starter
  • 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.

    Chrome & Natural Competition Series Big Bore 131ci 150 HP Engine

    Polished Drag Race Style Primary Belt Drive with Outboard Support

    Ultima's new belt drive assembly revives the Old School drag race style primary drive at a new affordable price. The Street Style unit with the outboard support was designed to handle all the power you can throw at it, with an extra plate Barnett Clutch assembly and Goodyear 85mm wide (3.35") belts to handle all the power you can throw at it.

    Designed to fit OEM Harley-Davidson Motorcycles and custom applications. These Belt Drives will also fit most aftermarket Softail and Rigid Frames designed to use Softail style components. These Belt Drives are the best value on the market, and come with a One Year Manufacturer's Warranty.

    Customize your kit by selecting a different style Belt Drive! More information available upon request.

    Chrome & Cast Finish 6-Speed Left Side Drive Transmission

    Ultima's NEW 6-speed transmissions are the ultimate upgrade for biles with 100+ horsepower engines. Designed to compliment our El Bruto series engines or any high horsepower unit you've created. They are packed with features found in most higher priced transmissions. These transmissions are the best value on the market, and come with a 2 Year or 20,000 Mile Manufacturer's Warranty.

    Right Side Drive Transmission available upon request! These transmissions are available in both cable type operated clutch and hydraulic operated clutch styles.

    Features Include:

    • Gears and shaft made from hardened 8620 steel giving you years of service with big inch engine
    • Pro-cut lead-in ramps for positive shifting
    • Aluminum bronze and hardened steel shift forks for durability and longevity
    • Roller detent gives you smooth and positive shifting action
    • Billet trap door
    • Reinforced transmission case machined from permanent mold A356-T6 Aluminum
    • Assembed by professionals and bench tested
    • Close ratio 2.94 low gear set:
      1st gear - 2.94:1
      2nd gear - 2.21:1
      3rd gear - 1.6:1
      4th gear - 1.23:1
      5th gear - 1.00:1
      6th gear - 0.86:1

    Chrome 2.0 kW Heavy Duty Thunderfire Starter

    Ultima is setting the standard in Starter performance and value with the new Heavy Duty series Thunder Fire starters for model Big Twins. These Starters are built with all new tooling and all parts are new. These Starters have long lives and exceptional performance, and are the best value on the market.

    The 1.75 kW series is made for Big inch engines, has heavier clutch gears, and includes a manual push button cap on the solenoid. This Starter fits stock applications on Big Twins where 7/8" longer body is not a problem. It requires a 300 amp Battery and good cables for best results. This Starter comes with a One Year Manufacturer's Warranty.