Collections: Drivetrain & Transmission
Ultima is now offering the new " El Bruto" series engines which are designed to provide our customers with a USA built high performance engine that was priced to be the best value of any engines now on the market. All of the castings in these engines are poured in US foundries and are based on all new CAD designs cast from C355 aluminum, a common US 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.
Our 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.
Ultima is proud to introduce our performance carburetors, directly interchangeable with S&S Super G carburetors. Ultima carburetors will accept S&S jets and S&S bolt pattern air filter assemblies. A relocated accelerator pump nozzle has increased throttle response and thunder jets are bolt on. Simply remove the plugs and screw in the Thunder Jet. No expensive machining required.
Features 6-Speed LSD Overdrive. When the bike hits freeway speeds, simply shift into 6th gear and lower the cruising RPM. Freeway cruising becomes more enjoyable with reduced vibration, increased gas mileage while keeping the engine in the heart of its torque band. This 6-speed transmission is complete, and ready-to-install