2010 Knucklehead S&S K-Bob

Rare 50th Anniversary Factory Built Model

Serial #004 of only 24 Made & Only 1 With Flame Paint

Spectacular Brand New Condition Only 274 Miles

Will Cost Over $53,000 For S&S To Duplicate this Bike Today

Here is an extraordinary opportunity to acquire one of the rarest and most historically significant motorcycles ever produced by S&S Cycle:

The Only 2010 Flathead Power K-Bob with Its Original Flame Paint, serial number 004.

Created to celebrate the 50th anniversary of S&S Cycle, the K-Bob is a modern, hand-built interpretation of a stripped-down 1946 Harley-Davidson Knucklehead bobber. Only 24 examples were produced worldwide, and this fourth-production motorcycle is the only one fitted at the factory with its spectacular custom flame paintwork.

It has traveled just 274 miles from new and remains in immaculate, showroom-quality brand new condition.

Documented S&S Provenance

This K-Bob was purchased new directly from S&S Cycle by Chicago-area collector John Risley.

It has remained indoors and carefully preserved throughout its life.

The motorcycle is accompanied by exceptional documentation, including:

• Original Flathead Power K-Bob owner’s manual

• Original 2010 S&S Cycle presentation letter

• Documentation identifying it as the fourth K-Bob built

• Written confirmation that its flame paintwork was unique among the 24 produced

• Original ownership and title documentation

• Recent Kaplan Cycles service records

The S&S letter states:

“Congratulations for purchasing the fourth K-Bob motorcycle ever built by S&S Cycle. The flame paint we supplied with the bike makes your investment truly unique.”

The motorcycle is titled as a 2010 Flathead Power K-Bob. Its VIN ends in 004, corresponding with the accompanying S&S documentation identifying it as production number four.

The Flathead Power and S&S Story

Flathead Power became known for developing high-quality reproduction engines and components for early Harley-Davidson motorcycles. While developing its reproduction Knucklehead engine, the company and its tooling were acquired by S&S Cycle.

S&S brought the project in-house and completed the development of a fully manufactured reproduction Knucklehead-style engine. The K-Bob showcased that achievement while commemorating the company’s 50th anniversary.

For decades, S&S has been one of the most respected names in American V-twin performance, engine manufacturing and restoration support. The company designed and assembled the complete K-Bob motorcycle—not merely its engine.

This was a true limited-production S&S motorcycle built for an exceptional moment in the company’s history.

93-Cubic-Inch S&S Knucklehead Power

At the heart of the K-Bob is a 93-cubic-inch S&S-built Knucklehead-style V-twin rated at approximately 74 horsepower.

It combines the unmistakable appearance of a vintage Knucklehead with the power, precision and reliability expected from a modern S&S engine. Performance is considerably stronger than that of an original 1940s Knucklehead and compares favorably with later large-displacement Harley-Davidson Evolution-powered motorcycles.

Notable equipment includes:

• 93-cubic-inch S&S Knucklehead-style V-twin

• 74 horsepower

• S&S carburetor

• Crane electronic ignition

• Free-flowing exhaust system

• Kick starting

• Period-style hand shifter

• Foot-operated clutch

• Hardtail frame

• Sprung seat post with approximately four inches of travel

• Passenger accommodations

• Wide Wire-spoke wheels

• Polished aluminum cylinder heads

• Traditional external oil tank

• Classic bobber styling

The “K-Bob” name is simple and appropriate: “K” for Knucklehead and “Bob” for bobber.

Its design recalls the stripped-down custom motorcycles built by returning servicemen following World War II. It has the stance, mechanical presence and character of a genuine period Knucklehead bobber, yet it runs and rides like a new modern S&S-built motorcycle.

Only 274 Original Miles

This motorcycle was acquired new by a serious collector and ridden sparingly. It currently shows just 274 miles, including a recent Kaplan Cycles road test following its comprehensive service.

The condition is exceptional throughout. The paint, chrome, polished aluminum, frame, wheels, engine and controls all present as one would expect from an extremely low-mileage motorcycle stored indoors since new.

It would be difficult to distinguish this motorcycle from a freshly delivered example.

Comprehensive Recent Service

Because of its age and extremely limited use, the K-Bob was thoroughly inspected and serviced by Kaplan Cycles technician Justin “Mr. Turbo” Harris.

Work performed included:

• Removed and replaced the fuel lines

• Installed new Motion Pro fuel lines and fuel filter

• Removed and inspected the air cleaner

• Removed and completely disassembled the carburetor

• Cleaned the main and intermediate jets

• Rebuilt the accelerator pump

• Carburetor components professionally dipped and ultrasonically cleaned

• Verified that all fuel passages were completely clear

• Lubricated the choke mechanism

• Reassembled and adjusted the carburetor to factory specifications

• Set the fuel mixture, idle and accelerator pump

• Set the Crane electronic ignition to factory specifications

• Installed a new Yuasa battery

• Installed a new 12-volt horn

• Installed a new rear brake switch

• Adjusted the primary chain to factory specification

• Removed the primary cover and installed a new cork gasket

• Tightened the rear hub fasteners

• Drained and refilled the oil tank with premium Harley-Davidson 20W-50 motorcycle oil

• Inspected the transmission oil level and condition

• Adjusted the front and rear brakes

• Inspected and tightened the brake mechanisms

• Tested all electrical equipment

• Compression-tested both cylinders

• Borescope-inspected both cylinders they look perfect & new

• Verified visible factory crosshatching and minimal carbon

• Set both tire pressures

• Adjusted the final-drive chain

• Completed a full road test

The engine internals appear virtually new, with the original cylinder crosshatching still clearly visible. Compression tested properly in both cylinders, and the motorcycle starts easily, settles into a steady idle and runs exactly as it should.

A Genuine Limited-Production Motorcycle

This is not an assembled aftermarket custom or a home-built replica. It is a production motorcycle designed, manufactured, painted and completed by S&S Cycle.

It carries its factory VIN tag and is 50-state EPA-certified. The original S&S documentation verifies both its production sequence and one-of-one flame paintwork.

With genuine vintage Knuckleheads routinely valued well into the five-figure and even six-figure range, the K-Bob offers the appearance and character of an iconic American motorcycle with a substantially more powerful modern engine and extremely limited production history.

Its original price was $30,000 with its custom S&S-supplied paintwork. Recreating a motorcycle of this quality today would cost over 50k today—assuming S&S would even accept such a commission.

Investment-Quality American Motorcycle

To our knowledge, this is presently the only S&S K-Bob publicly available for purchase anywhere in the world. Many of the other 23 examples were reportedly exported, making these motorcycles exceptionally difficult to find.

Consider what this example offers:

• One of only 24 produced worldwide

• Fourth production K-Bob built

• Only known example with factory-supplied flame paint

• Just 274 original miles

• Single collector ownership from new

• Original S&S presentation letter

• Original owner’s manual

• Matching production documentation

• Comprehensive recent mechanical service

• Immaculate showroom-quality condition

• 50-state EPA-certified

• Ready to display or enjoy

This is an exceptional centerpiece for an S&S, Harley-Davidson, American V-twin or historically significant custom-motorcycle collection. It combines rarity, documented provenance, outstanding craftsmanship and an unmistakable visual presence.

Call Junior at 860-454-7024 with any questions.

We offer licensed, enclosed and insured transportation throughout the continental United States, and worldwide shipping assistance is available. Financing may be available through Freedom Road Financial, and quality trades will be considered.

This is an extremely rare opportunity to acquire a one of a kind; 1 of only 24 K-Bobs ever hand-built by S&S Cycle.

God bless America.

WHY SHOULD YOU BUY FROM KAPLAN? WHAT DO YOU GET?

“You are buying from the Kaplan Cycles Family. We are not just another big auction house. We are family-owned and operated and have been buying, servicing, and selling motorcycles since 1975. You will work directly with Ken Jr., Ken Sr., and/or one of the 30+ experts on our team. We provide museum-quality, white-glove concierge service from start to finish. Every motorcycle we sell is inspected, serviced, and supported by our team, and we stand behind it after the sale. You’re not on your own — we back what we build and what we sell.

With over 17,000 units sold and still 100% positive feedback, we are the best stress-free buying experience you can have. From the first call to delivery at your door, we will handle it all — because vintage motorcycles deserve support, and so do you.

With every bike we curate you get:
• museum-level inspection & preservation services
• every machine is professionally evaluated, serviced, & rotisserie detailed
• all critical systems are checked, adjusted, or renewed
• you get professional setup, tuning, and delivery prep
• done by the best experts in the industry — we ride and restore every day
• you get post-sale phone support
• you get white-glove, insured, always-enclosed shipping to your door anywhere in the country

You’re buying from Kaplan Cycles at the New England Motorcycle Museum, one of the largest vintage motorcycle collections in North America. Free museum tours and tickets are included with every bike sold. With every bike you purchase, a portion of the proceeds is used to support, continue, and improve the 501(c)(3) nonprofit New England Motorcycle Museum.

You don’t just win an auction — YOU are creating & helping to preserve motorcycle history, and you become part of our family, a Kaplan Cycles client for life.

We do not take new clients off the street.
We do not service bikes purchased elsewhere.
We only take new exclusive clients who purchase a motorcycle from us.

You get a guided purchase experience with, and from, the experts who care about the bike as much as you do. If there’s a problem, you don’t get ghosted. You call us — you will have our cell phone numbers — we will answer your call on weekends, and we will help make it right.

Auction platforms = listing only. No support. No accountability.

Kaplan Cycles = we stand behind what we sell.

You are buying museum-curated provenance. That means:
• expert evaluation
• documented condition
• professional presentation
• long-term preservation mindset

You’re not just buying a motorcycle — you’re buying a curated piece of motorcycling history.

From the #1 family in this business — Kaplan Cycles & the New England Motorcycle Museum.

Sincerely,

Ken Kaplan Sr.
12/28/2025”

AUCTION TERMS:

All motorcycles & vehicles are sold as-is where-is.

Kaplan Cycles guarantees all motorcycles are as-described. Please read the entire description and watch the entire video before bidding.

A non-refundable deposit is due immediately on purchase. PayPal or Credit Card is accepted for the deposit.

Cash (In-Person), Card (+3% fee), or Wire Transfer are our only accepted forms of final payment.

Full payment must be made within 7 days of auction close.

Your motorcycle must be picked up within 30 days of auction close. 

Exceptions are made only for international buyers OR buyers who have ALREADY made transport arrangements with a third party.

If a motorcycle is purchased and left here for longer than 30 days without written permission from Kaplan Cycles it will be resold. In the case of a re-sale, the owner will be entitled to a refund less storage fees ($25/ day beginning 30 days from auction close) ONLY if the motorcycle was paid in full on-time within the auction terms.

We always describe our motorcycles as accurately as possible.

You are purchasing a classic motorcycle. Even in cases where a bike may be in good running/ operating condition, new problems & idiosyncrasies can arise over-time from sitting or regular use.

If you have an issue with the motorcycle you’ve received, contact us within 24 hours of delivery and before leaving feedback so that we can address your concerns.

It is important you have at least a basic mechanical knowledge before purchasing and operating a classic motorcycle.

Due to our backlog, we cannot perform any additional service work or modifications on your motorcycle after the sale (ie; adding a light kit, different tires, etc.)

We respond quickly between the hours of 9am and 5pm EST, Monday - Friday

For our fastest service please call Ken Kaplan Jr directly at 860-471-0192

We will not charge out-of-state buyers sales tax.
Out of state residents will pay sales tax with their DMV. 

We are not a registering dealership. You will receive only the documents required to register your vehicle in your state.

In our listings, title status is always listed directly below the main description.

In some cases we will sell motorcycles without title or registration. In these cases we guarantee all motorcycles sold are free and clear. We will always provide a route to obtaining title. Generally in these cases, the motorcycle will be sold at a discount to accommodate expenses involved.

Documents are mailed via USPS priority mail with a tracking number. Please allow up to 14 days after payment in full for your documents to be processed and mailed.

Keys will be shipped with the motorcycle.

Warranty:

All Motorcycles sold "as is, where is" and Kaplan Cycles does not warranty any motorcycle sold. No express warranty and/or implied warranty are made by Kaplan Cycles. No statements by us give an implied warranty.

SHIPPING:

SEND US YOUR ZIP FOR A SHIPPING QUOTE!
WE WILL MAKE ALL ARRANGEMENTS!

We have the best shipping contacts in the nation who will provide the FASTEST transport times, have a perfect track record, and are always insured and ENCLOSED! All motorcycles are shipped WHOLE (roll-on, roll-off). We do not offer a pallet or crate service.

International shipping specialist contacts are available! They will assist in ground freight, customs clearance, and ocean freight to your country. International buyers will be required to work directly with our third party shipping contacts.

We strongly recommend you insure your motorcycle at the time of purchase.

PICKUP:

We require a 24 hour notice prior to pick-up. Please call us at 860-454-7024 during office hours Monday – Friday 9am – 5pm EST.

We will provide ramps, a dock for loading, and assistance to load for free.