Darkhorse Crankworks
Darkhorse Crankworks

Darkhorse Crankworks     |     10629 Highway 42     |     Newton, Wisconsin 53063     |     (920) 726-9999

The TRUE Solution to a Smooth Lower End

Darkhorse Crankworks' proprietary process to blueprint and balance, build or remanufacture crankshaft assemblies for the best builders in the world is the key to your dealerships success.  We have over 30 years of experience remanufacturing Harley-Davidson® engines and are considered the motorcycle industry's leading experts. Our proprietary bearing and engine case upgrades came from our passion to provide outstanding service to our Harley-Davidson dealers and performance shops throughout the world!

On The Cutting Edge

Darkhorse Crankworks was responsible for building and engineering the crankshaft work in the below videos for Harley-Davidson & Pepper: DLRA Speed Week held in Austraila and prototype Project 156 for Victory Motorcycles. View videos!

Family Owned and Operated

Our family owned business started in 1980 with a passion to only build the best Harley-Davidson® motors, with that amount experience building engines and multiple National Championships (James Gang/Hoban Brothers Racing) in professional motorcycle racing, you can rest assured you are getting the best precision work available in the industry today.

Please contact us before you buy a new Harley-Davidson® crankshaft assembly, as we can blueprint and remanufacture Harley-Davidson® crankshafts, very often for half of the cost of new.  If the OEM crankshaft cannot be remanufactured, or you choose to increase the displacement, we can supply you with a Darkhorse Crankworks certified new crankshaft and/or assembled lower unit that will be the rock solid foundation to your bottom line!

Our Products Stand the Test of Time and Torque

Darkhorse Crankworks continues to be the leaders in the motorcycle industry developing reliable power and a smooth delivery from our precision parts, high performance crankshafts and engine crankcase upgrades.  Whether it’s building a new 4 5/8” stroker crankshaft, upgrading cases and bearings to support today’s modern high-output crankshafts, to rebuilding a vintage Knucklehead lower end; you have a foundation you know will stand the test of time and torque.

Complete the online forms for the Remanufacture Work Order or the Flywheel Order Online Form. All work must be accompanied with a completed work order form to ensure your work is done completely, properly and in a timely manner.

View warranty info. All street version crankshafts and parts come with a 24-month, unlimited mileage warranty against manufacturer defect. Our craftsmanship is unparalleled in the motorcycle industry.


I haven’t talked to you since you did that Twin Cam crank for our shop Blower King which was unbelievable! Thing is seriously smoother than a brand new Milwaukee 8, and a helluva lot faster/scarier/crazier!


Dan Cheeseman, VP
Klock Werks

You folks did the crankshaft and case work on my 2003 FLHRI engine for Baisley in Portland. I am very impressed how smooth this engine is even though it has 4.125” cylinders on it. It is running 120 hp. and 123 torque.

Thank you for a great job!

Rob Lien