Man O-War Motor Products


Engineering EXCELLENCE Handcrafted & made in the U.S.A.


Man O-War CrankShafts

Rock Solid Foundation

Darkhorse Crankworks, long regarded as producing the strongest foundations for all Twin Cam® performance engines, released our Man O-War®  crankshaft that allows dealers & performance engine builders to put even more HP to the road without concerns associate with OEM crankshafts in performance motor builds

Premium Built to Order Crankshafts

Darkhorse Crankworks has always manufactured and sourced the absolute best products available for building or re-manufacturing Harley-Davidson® crankshafts.  Continuing in that tradition is the

 Man O' War, 4"-3/8" and 4'-5/8" stroke Alpha or B-model configurations that are truly a "custom built" crankshaft with a 5-8 business day lead time.

We build with a true bottom up approach; where we focus strictly on the foundation to all engine builds.  We can utilize engineered balance factors from our vast library of engine dynamics while being able to install a wide variety of components and connecting rods that dealers can not get from any distributor 'off the shelf'.  This is the primary reason our dealers rely on only Darkhorse Crankworks to be the cornerstone to all their lower end engine builds for 40+ years.

Lead Time

We currently have lead times of 5-8 business days for custom built Man O'War crankshafts in house.  Please download or print our "New Flywheel Order" form off website & email and we will take it from there or simply call our Technical Sales Rep Andrew and he will walk you through the process!

 John, just wanted to thank you and your crew at Darkhorse for building and assembling my twin cam lower end, it's extremely smooth and feels snappy and quicker revving than before! Your professional work and attitude are greatly appreciated! Rob Dueker, Chatsworth, CA




Man O-War Motorsprocket system by DarkHorse

This motorsprocket is the 1st performance engineered 

primary motor sprocket on the market that provides 

"instant torque response" combined with an 

“engine pulse absorbing cushion drive”  primary system for 

Harley-Davidson TwinCam® and Milwaukee 8®  models.

Engineered to withstand the test of Time and Torque

Through extensive model design & testing, the Man O-War Motorsprocket is the only product on the market today that is engineered for longevity compared to OEM compensating sprockets without sacrificing rider comfort.  This patented system also puts an emphasis on rider comfort compared to the noise and harsh feeling under loads associated with 1 piece solid motor sprockets. 

These premium features combined with being inexpensive to service versus expensive compensator based sprockets that fail and need to be replaced as an entire unit.  The Man O-War  will be the last motorsprocket you will need to buy for your 

Harley-Davidson TwinCam® or  M8®  model.

Balanced & Bulletproof

All these benefits combined with being a billet machined, balanced motorsprocket that weighs nearly 2 pounds less than the OEM compensator and ½ the amount of parts,  you do not have to look any further to increasing your “trouble free” miles on your Harley-Davidson TwinCam® or Milwaukee 8® motorcycle.  

Replacing cushions costs considerably less, estimated at under 1 hour labor with proper tooling and our certified 8 piece cushion kit is currently priced at $39.95 + tax & shipping.

Gearing options

 Available in the OEM 34 tooth sprocket, or you can raise your RPM range with our 32 tooth gear sprocket to allow faster acceleration & better utilization of 6th gear at lower speeds without lugging.

12 Month Limited Warranty 

*Purchase of the 32 tooth sprocket requires our primary chain adjuster shoe that attaches to OEM auto chain tensioner or other adjusters that can expand to proper additional chain tension

 *Master rebuild kits including drive sprocket inner bushing will require the unit to be sent in for service.  8 piece Cushion kits are available from our dealer network or at our Man O-War Motorproducts store.

"I think it is F'n AWESOME, instantly feels like more power and torque even though I know there isn't any!  Grabbing rubber in 4 gears, it is smooth as silk at takeoff and downshifting.  Almost like I got a new M8 with just a motorsprocket!"  Chris Waddell, Cycle Solutions, Fort Meyers Beach, FL.