The 159ci Kit from Leading Edge V-Twin is unlike anything the custom motorcycle industry has seen before. This kit can deliver your Milwaukee Eight powered motorcycle 200+ horsepower and 210+ ft-lb of torque

This performance kit increases your Harley-Davidson M8 engine’s torque and horsepower by over 60 percent. It runs on pump gas at 11:1 compression making it a big-inch motor upgrade that provides both consistent and dependable naturally-aspirated horsepower as well as massive amounts of torque. The engine cases have to be thoroughly and expertly machined for this version of the big-inch kit to be used.

The Leading Edge 159 kit comes complete with a balanced crank allowing the factory balancer assembly to be eliminated. The kit also comes complete with a Timken bearing conversion, proprietary H-beam rods, pistons, and cylinders, a performance oil pump and cam plate, performance valve springs and tappets. Options also include your choice of a “horsepower” or “torque” style cam to fit your personal taste and riding style.

Included items in the 159ci kit are: Flywheel assembly, cylinders, pistons, timken bearing conversion, roller bearing on pinion side, cam bearing, choice of cam, lifters, pushrods, piston jet block off plate kit, and all the necessary gaskets and seals.

Details of what’s in the LE 159ci kit.

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

Rods 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 

Cylinders Our cylinders are made in the USA from aerospace-grade billet aluminum. Our radically different fin design results in far more efficient air cooling. Inside the cylinders reside aircraft-grade steel sleeves coated with our proprietary mix of Nikasil nickel/carbide/silicon plating.

Crank 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.

The 159ci Kit can only be ordered as a kit where your complete bike or motor is sent to us in Phoenix, Arizona and we do the installation and dyno tuning free of charge.

We also offer turn-key 159ci crate engines that can be delivered world-wide via freight  Please email us for more info.

A half-down deposit is needed to secure a 159 kit on our waiting list. Due to each set being built-to-order there are no refunds or exchanges on these kits.

CURRENTLY ALL OF OUR PRODUCTS ARE SUBJECT TO A 2-8 WEEK WAIT