Darkhorse Crankworks
Darkhorse Crankworks

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

FAQ

General Repair Questions

Do I need to fill out a Work Order?
Do you line-lap Evolution cases?
What guidelines do you use to bore cases?
What specifications does Darkhorse follow?
What guidelines do you use to install crankshafts?
Where do you measure crankshaft total indicated run-out?
Do you work on motorcycle heads or cylinders?
What cam or heads should I run with my motorcycle engine?
Can you recommend an engine builder?
Can I speak directly with a technician?
I have a question on the assembly procedures. What do I do?
How long will you store a crankshaft without a work order?

Timken Questions

How do I assemble my Timken® bearing conversion crankcase?
Can I interchange INA spacers for Timken?
What is the Timken end-play set at?
Must I send in both case halves for a Timken bearing upgrade?

Dealer Questions

How do I get a dealer discount?
I work out of my garage part time. Can I be a Darkhorse Crankshaft dealer?
What dealers do you recommend?

Warranty Questions

What is your warranty?
Do you insure parts that are shipped to you?
Are you responsible for damages?

Shipping Questions

How are packages shipped?
How do I ship a crankshaft?
Do you insure parts that are shipped?
What do I need to send to you with my parts?

Do I need to fill out a work order?
Yes. All work must include a work order form. Go to the New Work Order Form or the Remanufacture Work Order Form page and complete the form online, print it and include with your parts. We ask that you fill these forms our prior to sending in your part so that we have all instructions and contact info handy. If you prefer, you can print out a hard copy of the forms and complete them by hand by click on the Remanufacture Work Order Form (PDF), or the New Work Order Form (PDF). Back to top.

Do you line-lap Evolution cases?
Yes. Your pinion shaft bearing race MUST be used for proper fitment. We will not be responsible for improper fitment if our machinists are unable to measure your pinion race. When pinion races do not meet our specs, have the pinion replacement serviced and toleranced checked and proper bearings fitted. Back to top.

What guidelines do you use to bore cases?
Darkhorse Crankworks bore cases according to cylinder manufacturer's tolerances which vary. We have specific processes for each manufacturer and may choose to position center case bolt as a "through bolt "versus a "tapped blind hole" for added structural integrity. You may receive top center case bolt with cases that are integrated to that specific bore and case. The positioning of this bolt is critical and must align with case opening so it does not distort cylinders upon installation. Weeping at center case bolt may occur if not sealed properly. We recommend a semi-drying liquid gasket and a clean surface behind the sealing washers of case bolt supplied to deter any weeping from occurring on either side. Back to top.

What specifications does Darkhorse follow?
We blueprint all crankcase and crankshaft work to meet or exceed OEM specifications. Back to top.

What guidelines do you use to install crankshafts?
Our crankshafts will install as any stock flywheel per the manufacturer's recommendations. We hold strict tolerances according to or exceeding manufacturer's recommendations and ask that you do the same. Back to top.

Where do you measure crankshaft total indicated run-out?
Our stance on this issue has not changed or wavered since 1980.  The most important unit of measurement is at each main bearing race with a crankshaft orientated on proper shaft centers. Our warranty is based off this measurement - without exception. Back to top.

Do you work on motorcycle heads or cylinders?
No, we do not. We do work for almost all the top builders around the world. We would not think of competing against them. This is why they trust us and recommend our services in return. Back to top.

What cam or heads should I run with my engine?
We do not get involved with cam or head decisions. Please consult with your chosen engine builder or top-end professional. Back to top.

Can you recommend an engine builder?
We work for many throughout the USA and would find it difficult to recommend one over another. Review our dealer locator map to locate a dealer near you that listens to what you want and one that you feel confident will get the performance and output YOU require. Back to top.

Can I speak directly with a technician?
Yes. You may contact a technician to answer any question regarding our work or process between 9:00 AM - 5:00 PM CST Monday through Friday. Back to top.

I have a question on the assembly procedures. What do I do?
Refer to the factory service manual for information on assembly procedures or feel free to call us between 9:00 AM - 5:00 PM CST Monday through Friday.   Back to top.

How long will you store a crankshaft without a work order
Crankshafts designated by supplier without a clear direction of work to be done, will be considered abandoned after 12 months. All associated parts will become property of Darkhorse Crankworks.   Back to top.

How do I assemble my Timken® bearing conversion crankcase?
For any questions or concerns regarding one of our Timken bearing conversion cases in late model Twin Cam applications, please refer to Harley Davidson 1999' or 2000' FLT service and parts manual for FLHT, FLT and FLHR models, 99' or 00' Dyna service and parts manual for any Dyna series and 2000' service or parts manual only for Softail series bikes. Or, you can contact us directly from 9:00 AM - 5:00 PM CST Monday through Friday. Back to top.

Can I interchange INA spacers for Timken?
No! You CANNOT interchange INA® bearing sprocket shaft spacers for Timken-style bearing spacer. This will cause damage to primary components and may cause injury or death. We will supply the corresponding correct sprocket shaft spacer unless notified at time of shipping. Back to top.

What is the Timken end-play set at?
We install races and preset Timken bearing end-play between .001” - .003”. You must check this measurement upon final installation into case and make sure they are within factory specs of .001” - .005” This is very critical to the longevity of your motor and related parts. Back to top.

Must I send in both case halves for a Timken bearing upgrade?
Yes. We first verify that case halves are concentric to < .001”  before we install our conversion insert.  This is critical to the longevity of the entire motor. When we verify main bearing bore alignment, we will also cut a groove to retain the pinion bearing in the right side case half. Back to top.

How do I get a dealer discount?
To receive a dealer discount, a Dealer Application must be approved and on file upon completion of work. Our procedures do not include part costs. Please do not assume it will be all-inclusive. We work on brand new to very old crankshafts and cases. It would be impossible for us to have set flat rates for our procedures.  Contact us if you need a quote prior to beginning work. Back to top.

I work out of my garage part time. Can I be a Darkhorse Crankworks dealer?
No. We require all dealers to be full-time dealers who work on Harley Davidson motorcycles as their primary source of income. We understand there are many great mechanics who work on the side. However, we must protect our dealers and their ability to make a fair living representing and focused on our product.  You can purchase our product at retail prices through us. We encourage everyone to support our dealer network as their first choice. Back to top.

What dealers do you recommend?
We work for many throughout the USA and would find it difficult to recommend one over another. Review our dealer locator map to locate a dealer near you that listens to what you want, and one that you will get the performance and output YOU require. Back to top.

What is your warranty?
The Darkhorse Limited Warranty covers all street versions of our crankshafts and casework including remanufactured components. The 2 year/unlimited mileage warranty protects you against workmanship defect. We true all crankshafts to within .0015” total indicated run-out at each main bearing race and guarantee all street/OEM applications to stay within  .0005” for 2 years and unlimited miles. Back to top.

Do you insure parts that are shipped?
We will insure the package for estimated value of product plus services. If something exceeds normal value, you must document the need for added insurance value on the work order. Back to top.

Are you responsible for damages?
Darkhorse Crankworks shall not, under any circumstances, be held liable for consequential damages, including parts not sold by Darkhorse Crankworks, labor not performed by Darkhorse Crankworks, or loss of profits.  Installation of any aftermarket part, including parts and services by Darkhorse Crankworks, may adversely effect the OEM vehicle warranty. Back to top.

How are packages shipped?
All packages are shipped UPS regular ground unless requested and stated. Prices do NOT include return shipping. Back to top.

How do I ship a crankshaft?
Crankshafts that are not captured, have a tendency to rock back and forth during shipment and damage associated parts.  Please lock-down crankshaft and cases from any movement. Double walled corrugated cardboard boxes should be used at a minimum for shipping. We recommend you include a base of wood or extra cardboard to support product. Heavy paper or cardboard must be used in direct contact with engine parts. Packing peanuts or bubble wrap are not satisfactory packing materials for heavyweight crankcases or crankshafts.  Please package accordingly when shipping product to us, and we will package with that same expectation in return to you. We will insure product in return shipping for our estimated cost for product replacement (including our services). We recommend you insure the product too. We will not be held responsible for any shipping damage. Back to top.

I received the bottom end on Tuesday and was running Wed afternoon. I logged almost 700 miles in the last 4 days and have to say its the smoothest and non-fatiguing ride i have had on this bike. Motor is super quiet and my wife also commented on the lack of vibrations. The new gear drive is super quiet with the crankwork! Thanks for providing a quality build that exceeded my expectations and for the excellent communication and service!

John C. Saunders
Texas

I'm EXTREMELY pleased with your work on my crank/flywheel "tig and rig/balance" job and with high comp pistons in a big bore kit with an S&S etc. it's MORE than I ever expected - WORTH EVERY DIME!

JT Sandow
Cycling Enthusiast