Janus Motorcycles Announces a New Hartford 450 Engine

We have some big news here at Janus Motorcycles.  

After five years with our original 450 platform, we are excited to announce that future Janus 450 motorcycles will be powered by a new engine supplied by Hartford Industrial of Taiwan.

This decision follows months of engineering, calibration, and real-world testing. While the supplier has changed, our philosophy has not. We still believe a Janus motorcycle should be lightweight, reliable, approachable, and easy to maintain. The new Hartford 450 engine allows us to continue delivering those qualities while strengthening our long-term supply chain and manufacturing partnerships.

The first Halcyon 450 prototype equipped with the Hartford engine has been undergoing testing throughout the spring, and we’re excited to share how we arrived at this decision.

Why Janus Motorcycles Uses Partner-Supplied Engines

The transition from SWM to Hartford was driven by long-term supply chain stability, manufacturing confidence, and our commitment to preserving the lightweight, approachable character of every Janus 450.

For the entirety of our history, Janus Motorcycles has relied on engines sourced from other manufacturers. As a small motorcycle company, we participate in a long tradition that stretches back to the earliest days of motorcycling. Many of the industry’s most respected specialty manufacturers built their reputations not by designing every component in-house, but by carefully selecting and integrating engines from companies with the resources and expertise to develop them. From Brough Superior’s use of JAP engines to Morgan Cars and numerous modern boutique manufacturers working with specialist engine suppliers, the balance has often been found not in producing every part, but in bringing the right parts together into a coherent whole. The challenge is not to build every component yourself, but to find partners whose capabilities, priorities, and long-term vision align with your own and combine to create the best final product. From our first engine, the Senda 50cc two-stroke, to the CG250, and our current 450 engine, this philosophy has guided our choice of engines.

A great deal of thought and planning went into the selection of the initial engine for our 450 model line. For more on that and our original supplier, SWM, see Richard’s two-part post here and here.

Let’s start off with a little background on the Janus Motorcycles engine philosophy from Richard Worsham, Co-founder and CEO:

“I’ve written previously about the “bulletproof” heritage of our 250 engine and our reasons for selecting it: simplicity, ease of maintenance, reliability, and lightweight. When we set out to design the successor to our flagship Halcyon 250 model, not much of that design brief changed.

“The primary difference was that we wanted to offer a Halcyon that could better handle highway traffic. We also wanted an engine with fuel-injection. After taking the 250 line through EPA and California ARB testing we knew exactly how difficult taking a carbureted engine through 50-state emissions testing could be and knew that it would only get harder as we increased engine size and performance. However, there was also a lot about the Halcyon that we wanted to continue: the classic styling, lightweight, ease of operation & maintenance, and time-tested reliability being at the top of that list.”

We wanted to carry forward that simple, reliable, easy-to-maintain, and time-tested approach with the 450 line as well.

Halcyon 250 owner, Tim Hullinger, demonstrating the reliability of the bulletproof 250

What We Needed in a New 450 Engine

What we ended up with was the following list of requirements:

• Traditional design and look that would pair well with our timeless styling
• Well-known platform for service familiarity
• A long history of reliability that would offer similar low maintenance to our 250 line
• A supplier whose quality and long-term stability we could count on
• Around 30hp to get up to 85mph, but maintain our lightweight, manageable appeal
• A single-cylinder for overall simplicity
• Air-cooling for both aesthetics and simplicity
• Fuel-injection to streamline meeting modern 50-state emissions regulations and provide ease of use to the rider

This list of requirements narrowed our search considerably. Our scale and projected order quantities took most large manufacturers off the table, but left a small number of lower volume brands with mid-sized engines. Eventually, our research led us to the small Italian manufacturer, SWM, based 50 miles northeast of Milan, just a few miles from the MV Agusta and old Cagiva plants. Not only did SWM offer a traditional, air-cooled, single-cylinder 450 engine, but they had a history of offering crate engines to limited production motorcycle brands, including British marque, CCM.

SWM 450 engine used in early Janus Motorcycles 450 models

Why We Originally Chose the SWM 450 Engine

Over the past five years we have come to know the SWM engine well. In many respects, it proved to be exactly what we were looking for in a middleweight Janus motorcycle: simple, reliable, approachable, and capable. As time went on, however, the circumstances surrounding the engine began to change. The cost and related shipping of the SWM engines from China through Italy increased dramatically in the intervening years. This, along with recent tariff changes, trade uncertainty, and lengthy shipping delays prompted us to begin looking for a new engine supplier. The move also offered an opportunity to relocate the 450’s supply chain to Taiwan, a country whose manufacturing expertise and close relationship with Western markets give us confidence in the long-term stability and continued development of the platform.

Entrance to Hartford Industrial motorcycle manufacturing facility in Taichung, Taiwan

Why We Decided to Move Beyond SWM

As we began evaluating alternatives, we quickly realized that we were not looking for a different kind of engine. Over the preceding five years, we had spent enough time with the 450 platform to become convinced that the formula was right: a simple, air-cooled, fuel-injected single-cylinder with enough power for highway travel while remaining lightweight, approachable, and easy to live with and a proven, reliable design. What we were searching for was not a reinvention of our 450 motorcycle, but a way to preserve and continue developing the qualities that had attracted us to the platform in the first place.

More than a Motorcycle Manufacturer

Our search for a successor to the SWM 450 ultimately led us to Hartford Industrial of Taiwan. At first glance, Hartford appears to be a motorcycle manufacturer. They produce motorcycles, engines, and components under their own brand and have done so for decades. What interested us, however, was the history behind the company. Hartford’s roots stretch back to 1965, when company founder, Chen Chien-Chih, established She Hong Industrial. Over the following decades, the company built its reputation, not through motorcycles, but through machine tools, CNC machining centers, industrial controls, and factory automation systems.

An early Hartford mill (think Bridgeport).

The motorcycle side of the business came later and it came from a genuine passion for riding. Mr. Chen was an avid motorcyclist who eventually helped his son establish the subsidiary company, Hartford Motors, in 1995. Many of Hartford’s early motorcycles were built around versions of the Honda CG125 engine, a simple and durable design that will be quite familiar to Janus motorcycle owners. The engine architecture that powers our 250 models traces its lineage directly to that same family of engines. In a small way, both companies grew from an appreciation for the virtues of lightweight, practical motorcycles that place reliability, accessibility, and enjoyment ahead of complexity.

A Hartford HD-125L from 2000

That combination of industrial capability and enthusiasm for motorcycles is what makes Hartford unusual. Long before they began producing motorcycles, they had already built factories, developed proprietary machining technology, expanded internationally, and established themselves as a significant manufacturer of machine tools.

Many companies manufacture motorcycles.

Far fewer manufacture engines.

Fewer still manufacture the machines that manufacture the engines.

Janus Motorcycles Halcyon 450 Prototype undergoing Hartford engine dyno testing

What’s Next

Visiting Hartford: Behind the Scenes in Taiwan

Choosing Hartford was only the beginning. To complete the transition, we traveled to Taiwan with an entire Halcyon 450 to work directly alongside Hartford’s engineers during calibration, testing, and development.

In Part Two, we’ll take you inside Hartford’s facilities, show you how the engines are built, and explain what this partnership means for the future of Janus Motorcycles.

Frequently Asked Questions

Why did Janus Motorcycles change 450 engine suppliers?
We transitioned to Hartford Industrial to improve long-term supply chain stability while maintaining the lightweight, reliable character of the Janus 450.

Can I retrofit the new Hartford engine into my existing SWM-powered Janus motorcycle?
No. While we have worked hard over the years to make upgrades and retrofits across model generations, the Hartford 450 model was engineered as a completely new platform. From the engine mounting points and chassis integration, to the electrical and fuel delivery systems, the supporting components differ significantly from the previous platform making a retrofit impractical.

Will Janus continue to support motorcycles equipped with the SWM engine?
Yes. We remain committed to supporting every Janus motorcycle. We will continue to stock service parts, provide technical support, and service SWM-powered motorcycles just as we always have.

Where is the Hartford 450 engine manufactured?
The engine is manufactured by Hartford Industrial in Taiwan, a company with decades of experience in precision manufacturing, motorcycle production, and engine development.