Darkhorse Motor Company

Darkhorse Motor Company The Industry Leading Harley-Davidson Crankshaft Remanufacturing and Crankcase Services. Motor Sprocket & Crankshaft Products.
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233.742 MPH. Fastest Harley-Davidson in History.Darkhorse Motor Company congratulates Hiro Koiso Racing on setting a new...
09/02/2026

233.742 MPH. Fastest Harley-Davidson in History.

Darkhorse Motor Company congratulates Hiro Koiso Racing on setting a new AMA national record of 233.742 mph in the 3000 APS‑PBF class at the Bonneville Salt Flats, officially the fastest sit‑on Harley-Davidson ever recorded.

The JIMS/T‑Man 135ci Twin Cam, ProCharger boost, JIMS FAT6 transmission, WPC‑treated internals, and Worldwide Bearings all come together to put serious power to the salt.

This achievement is a testament to what focused engineering and relentless refinement can accomplish. We at Darkhorse Motor Co are always proud to see Harley‑Davidson performance pushed to its absolute limit.

Photo credit: Taka Masui Photography

Huge thank you to the DD Custom Cycles team for trusting Darkhorse Genuine Parts in your performance builds. It’s always...
08/10/2026

Huge thank you to the DD Custom Cycles team for trusting Darkhorse Genuine Parts in your performance builds. It’s always an honor to see our components in the hands of true craftsmen pushing the industry forward. Dave Dupor DD CUSTOM CYCLE

07/31/2026

Testimonial's from one of the best engine builders should never be taken lightly, especially in a race set up & all that race experience translates to the best longevity on the street

Sturgis bound? Our trusted dealers will hook you up with genuine Darkhorse Motor Co. products:Cycle Solutions Inc. Black...
07/29/2026

Sturgis bound?
Our trusted dealers will hook you up with genuine Darkhorse Motor Co. products:

Cycle Solutions Inc.


Black Hills Harley-Davidson

07/27/2026

Saddle up with Seth for a hard-earned win in the Bagger Racing League GP Class this weekend at Mid-Ohio.

Big shoutout to Tucker Speed for helping us relive the moment!

07/27/2026

Crowned Pinion Races — the King Pin of accuracy and longevity.

At Darkhorse, we developed a crowned profile that supports natural flywheel flex, keeps alignment true, and delivers unmatched stability at the main bearing/crank interface. Tested under extreme load, installable on new or used cranks, and superior to every OEM and aftermarket option. This is the race that upgrades any build to Darkhorse‑level integrity.

Trust genuine Darkhorse MoCo products in all your builds.

07/24/2026

Coming into the weekend like…
BRL Mid‑Ohio is ON. Tune in and help us cheer on Seth Dahmer and the Tucker Speed crew.

07/15/2026

Precision engineering built in every crankshaft, right down to correct wristpin & connecting rod alignment explained with our state of the Art Tobin-Arp Pin Boring machine.

Darkhorse Motor Co is proud to stand behind TRUE American manufacturing. Our components are machined, tested, and finish...
07/03/2026

Darkhorse Motor Co is proud to stand behind TRUE American manufacturing. Our components are machined, tested, and finished right here in the USA. Built right & built to last.

Address

10629 Highway 42
Newton, WI
53063

Opening Hours

Monday 9am - 5pm
Tuesday 9am - 5pm
Wednesday 9am - 5pm
Thursday 9am - 5pm
Friday 9am - 5pm

Telephone

(920) 726-9999

Website

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