Your Cart

Ultima® 4.25 Bore 127 CI Engine

 ultima® 4.25 bore 127 ci engine ultima 2
 ultima® 4.25 bore 127 ci engine ultima 3
 ultima® 4.25 bore 127 ci engine ultima 4
 ultima® 4.25 bore 127 ci engine ultima 5
 ultima® 4.25 bore 127 ci engine ultima 6
 ultima® 4.25 bore 127 ci engine ultima 7
  • Bore: 4.25”
  • Stroke: 4.5”
  • Piston: Forged
  • Compression: 10.2:1
  • Rated Power: 140 Horsepower
  • 140 LB FT Torque
  • Camshaft: .640” lift
  • Pushrods: Crane
  • Valve Spring: Ultima
  • Chrome Nose Cone / Rocker Boxes
  • Billet Oil Pump
  • Chrome Tappet Blocks
  • Ignition included on assembled engines.

127 C.I. 140 HP with 140 LB FT Torque.

Not EPA Compliant.

Made In U.S.A. Cast-in steel inserts guaranteed not to move. Large bore breather for increased crank case vacuum and less blow by. 1/2” Alignment dowels for true line bore. Counterbored stainless allen head case bolts. Close machining tolerances. Made from prime C355-T6 aluminum that is superior in strength to A356. Styling and cosmetic machining for a custom look.
Ultima® New state of the art designed crankshaft incorporates a massive 1.670 diameter pin that is pressed into the one piece, heat treated, 4140 steel flywheel half making these crankshafts some of the strongest available on the market today. These crankshafts feature all new 7.7” long H-Beam rods with .927 diameter wrist pins to handle all the power you can throw at them. These are also balanced using our exclusive methods making these some of the smoothest engines in the industry.
C355-T6 Casting. Cast in liners will not move.  All fins are machined for an excellent cosmetic appearance. 
C355-T6 Casting. All fins are machined for excellent cosmetic appearance. Twin Cam Styling means 30 % more fin than most Evolution® style heads for cooler running. Compression release valves. 2.100 stainless intake valves, 1.700 stainless exhaust valves. Manganese Bronze guides. High silicon wire valve spring with chromoly retainer.
Ultima® 4.25 Bore 127 CI Engine
The product images shown may represent the range of product, or be for illustration purposes only and may not be an exact representation of the product. The products attributes e.g. colour etc. vary with each unique part number. We recommend that customers unfamiliar with the products please do so accordingly.
VAT rules and rates
Customers are subject to Value Added Tax (VAT 21%). It is a consumption tax that applies to almost all goods and services bought and sold for use or consumption in the EU.
 ultima® 4.25 bore 127 ci engine ultima 8
Made in USA

The Ultima Competition Series Engine combine high quality components with affordable pricing giving you the best value available.

Ultima proven performance combinations deliver more horsepower & due to our exclusive balancing methods, we feel they are the smoothest engines on the market today. All components are machined on state of the art CNC equipment for guaranteed dimensional accuracy & repeatability. Ultima customers agree these engines are the best value anywhere.

Rated Output: 140 ft/lb torque & 140 HP

El Bruto® Series Ultima 4.25 Bore 127 CI  Engines. True to their name, the 4.250" bore 127 inch El Bruto Engines are horsepower extrordinaires. They are the most powerful EVO configuration of these sizes. These brutes have features which insure long life and pure riding enjoyment for those who need ultimate performance.

Ultima® is now offering the new “El Bruto®” Series Engines which are designed to provide our customers with a U.S.A. built High Performance engine that is priced to be the best value of any engines now on the market. Ultima’s commitment to engineering excellence and competitive pricing brought El Bruto® to life with a completely new designed set of castings emphasizing performance, reliability, and value.

All of the castings in these engines are based on all-new CAD designs cast from C355 aluminum, a common U.S. military alloy known for its stability over multiple heat cycles. The engine components are machined on state of the art CNC equipment for guaranteed dimensional accuracy and repeatability. All of our engines are dynamically balanced using proprietary methods to provide the smoothest running engines on the market and now with our new high flow cylinder heads these engines now can boast the most powerful engines on the market as well!! We think that you will agree these engines are the best value anywhere.  6 Month warranty from date of purchase.

For Ultima® Evo Engine Installation Manual Click Here

For Ultima® Evo Engine Dimensions Click Here

Download Ultima® Evo Engine Dimensions Click Here

For Ultima® Engines Displacement Codes Click Here.

  • SKU: 1
  • MPN: 298-272

Available Options

Lead time
Please acknowledge that Complete Engine have a lead time of 2-3 weeks.
By entering this Site you acknowledge and agree that nothing contained on this Site shall be construed as granting rights, by license or otherwise, to any DVX LLC intellectual property rights, including but not limited to copyrights, patents and trademarks.
By using our website, you hereby consent to our Privacy Policy and agree to its Terms and Conditions.