Leading Edge 131 Kit

Leading Edge 131 Kit

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 THE 131 Cubic Inch Kit from Leading Edge V-Twin is the newest offering of our technology. This motor has a 4.250 inch bore on a 4.625 Inch stroke for a total displacement of 131.223 cubic inches. Our kit differs from the competitors kit in that we are achieving the displacement with stroke and bore, not just bore. The other kits on the market employs a 4.310 inch bore on a stock stroke. That bore leaves you with a dangerously thin sleeve for the piston to ride in. 

The Leading Edge 131ci is a large bore and stroke kit for use any of Harley-Davidson’s Milwaukee Eight engine platforms. The engine cases do not require any modification. 

Included items in the 131ci kit are: Flywheel assembly, cylinders, pistons, upgraded roller bearing on the output side, new roller bearing on pinion side, cam bearing, choice of cam, lifters, pushrods, and all the necessary gaskets and seals an inluded.


Details of what’s in the LE 131ci kit. 


Our pistons are made of our proprietary design by CP Carillo. They are balanced and come with Total Seal rings. 



Our balanced rods are also made of our proprietary design by CP Carillo. Due to our design these rods are far stronger than stock while being significantly lighter. 



Our cylinders are made in the USA from aerospace-grade billet aluminum. Our radically different fin design results in far more efficient air cooling. A traditional fin design dissipates heat that is then pushed away as the air passes. Our design turns the cylinder body into an active cooling system. Inside the cylinders reside a Ductile Iron sleeve that is centrifugally forged right here in the United States. 



Our Flywheels are static balanced, assembled and then dynamically balanced allowing us to eliminate the stock counterbalancing system. We also use a proprietary crank pin that does not allow the flywheels to scissor. This design is so inherently strong that it eliminates any need to weld the flywheels. 



 There are many cam choices. We have a mild torque cam as well as a mild horsepower cam. For optimal performance We have an aggressive torque cam along with an aggressive horsepower cam. Each of these cam choices are key to the various LE 131ci characteristics and horsepower/torque. We can suggest a cam that will work best for you based on your specific riding style. 


Main Bearings 

We install a new upgraded roller bearing on the output side, and a new factory bearing on the pinion side.



We use precision-machined tappets that have been specifically designed to work well with each our high-performing cam grinds. Our hydraulic roller design also optimizes oil flow to the top end of the engine. 


Adjustable Push Rods 

Our adjustable tapered push rods are made from Chromoly. They are proprietarily designed to be extremely rigid while also being very lightweight. 


Oiling system modification 

We upgrade all oil pumps and cam plates to the S&S pump and plate. The S&S pump employs a dual scavenging system, that has a dedicated set of return gerotors for the crank case, and one for the cam chest. This design maintains proper oil levels in both of those chambers minimizing loss of power from excessive fluid being present. This in conjunction with our proprietary cylinder design makes the oil temperatures drop 15-20% in the oil tank. 

Other Available Options: 

Cylinder Head Porting - $1399 

We offer precision CNC-porting to achieve optimal air/fuel flow and velocity, along with installing valves that are 3mm larger than stock.  In addition to the headwork we also include a Leading Edge high-lift proprietary valve spring set that is stable under the increased horsepower and torque of the LE 159ci kit. We also install manganese bronze alloy valve guides as well as grind the new oversized valves to our exacting standards. 


Throttle body kit - $729 


Our throttle bodies are made entirely from billet aluminum and are designed to supply the proper amount of volume while maintaining the ideal air speed. This insures maximum efficiency while providing maximum power output. Please note that we require your stock throttle body to transfer all of the electronic throttle components to your new throttle body. Under extensive testing we have decided to use proprietary 8.4 gram per-second injectors. This size and design supplies the proper amount of fuel to the Leading Edge 151ci kit. These injectors are included with our throttle body kit. 


Air Cleaner - $349 


Once again we teamed up with Horsepower Inc to develop the highest-flowing intake money can buy. 


Exhaust - $1499 

Our Various Exhausts are made in the USA out of 304 stainless steel. Each pipe is tuned for our various cam sizes. 


Chain Drive Kit - $799 

After testing and using many of the chain drive kits currently on the market, we Suggest using a Cush Drive set up from IMZZ Elite or Alloy Art. 


Clutch - $429 

When inducing this much horsepower into any V-Twin engine a high-quality clutch is a must. We have worked closely with our engine designers and have come up with a clutch that can and will take the power that our LE 151ci kit dishes out. 


Transmission Internals – TBD 

We suggest either using a set of our CRYOed transmission internals or going with a beefier set up altogether such as a Baker Transmission Grudgebox.