Darkhorse Motor Company's 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 40 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!

Darkhorse Motor Company 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!

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 our Signature Series Man O-War crankshaft and/or assembled lower unit that will be the rock solid foundation 

to your bottom line!

Darkhorse Motor Company continues to be the leaders in the motorcycle industry developing reliable power and a smooth delivery from our precision parts, high performance crankshafts, our Man O-War®  motorproducts  and engine crankcase upgrades.  Whether it’s building a new 4" - 4 3/8" - 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.

Pioneers of our Pro-Plug & Shifting Flywheels

Fielding questions about run-out and scissoring/shifting 1st things 1st, we are not aware of 1 of our flywheels that have shifted on the crankpin, truthfully, NOT 1!  We have remanufactured well over 10,000 TwinCam crankshafts - That is our sole testament to the value of our engineered Pro-Plug system.  It provides integrity to the crankshaft as a whole to resist spreading of the wheels 180 degrees from TDC and does NOT allow the wheels to shift, something welding alone or ANY 5 piece crankshaft can not provide.

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.