[Developer Interview] The New Honda V3R 900 E-Compressor is a Semi-Hybrid! Electric Turbo... NA Version Also Under Test?!

The Honda "V3R 900 E-Compressor Prototype," unveiled globally at EICMA 2025 (Milan Show) and making its Japanese debut at the Osaka and Tokyo Motorcycle Shows this March, is a highly anticipated model currently under development, featuring the world's first electric supercharger in a two-wheeled vehicle. While we provided an overview at its initial reveal, this interview with the person in charge of V3R's development offers a deeper look into its concept, background, and future prospects!

Interviewee

Atsushi Kusuda
General Manager, Large Category, Business Planning Department
Motorcycle Business Operations Division, Honda Motor Co., Ltd.

Mr. Kusuda is the overall manager for Honda's mass-produced on-road models of 600cc and above. He served as the development manager for the V3R from the initial concept and packaging stages. Incidentally, the tires on the V3R displayed were heavily worn; these were the tires Mr. Kusuda himself used when riding the bike at HSR Kyushu during the PV shoot.

Questioning the Unique Layout That No One Can Replicate!

Honda V3R 900 E-Compressor Prototype

Webike Plus (hereinafter W): There are still many details about the mechanism that you cannot disclose at this time, correct?
Mr. Kusuda (hereinafter Kus): Yes. However, since the vehicle itself has been shown, we can talk about what is visible.
W: Understood. Let's start with the name. Since it's a "Prototype," can we assume it will be commercialized in this form?
Kus: Yes, we intend to bring it to market in this form.
W: How long do we have to wait until its release?
Kus: It's still under development, so there are parts we cannot disclose. Unfortunately, please wait a little longer.

Although camouflaged, the overall form is clearly visible. It has a look that suggests high performance, as if the mass has been tightly compressed front and rear.

W: Then, let's go back to the "why." What was the purpose and aim behind planning this V3 engine with an electric supercharger?
Kus: The vehicle concept is "a non-rail roller coaster that anyone can enjoy the exhilarating acceleration." We wanted to create a bike that offers unprecedented acceleration. Moreover, we wanted this roller coaster-like exhilaration to be accessible to general customers with a sense of security. We aimed to eliminate the high barrier to entry, like with supersports, where only skilled riders can truly experience its potential on a circuit.
So, what kind of vehicle could achieve this? The answer is the electric supercharger. By providing boost from low speeds and generating immense torque instantly, we decided, "This is the way to go!"
W: Electric superchargers have been used in four-wheeled vehicles, but this is the first time for a two-wheeled vehicle. That alone must have presented significant development challenges. Yet, Honda has chosen a V3 engine layout, which seems even more complex.
Kus: Yes, it is extremely difficult.
W: Is there also a desire to "do what no one else has done"?
Kus: Yes, there is. We want to express Honda's spirit by doing something unique. That's been the driving force behind the V3R from the very beginning of its development.

The V3 engine, announced as a 900cc with a 75° V-bank, is stated to achieve performance comparable to a 1200cc engine with environmental performance by precisely controlling the boost pressure of the world's first electric supercharger (E-compressor) in a two-wheeled vehicle, delivering high response from low RPMs.

Although further details are unknown, the exterior reveals a vertically split crankcase (meaning a single crankpin?), and camshafts positioned slightly lower on the exhaust side.

Reclaiming the No. 1 Spot, Now a Machine at the Pinnacle of Honda!

W: I see. As a motorcycle enthusiast, this is very exciting news. However, it feels like such an exciting project suddenly emerged out of nowhere. There was no particular anniversary or preamble, and then suddenly at EICMA 2024, a stripped-down chassis was unveiled. Given the scale of this project, there must have been a trigger.

The "V3 engine with electric supercharger" announced at EICMA 2024. At this time, the model name and exterior were not revealed, and it was displayed as a frame with front and rear suspension. Displacement was not announced, but it was stated to be "water-cooled 75°," "slim & compact," and "lightweight design requiring no intercooler."

While motorcycle media buzzed with excitement, the specific genre remained unclear (though there were holes on the top bridge that seemed to be for mounting an upright handlebar), perhaps making its true intention difficult for the general public to grasp?

Kus: Shortly before the V3R development began, Honda was criticized for lacking innovation and challenging new concepts. At that time, Honda's production volume was decreasing, and large-displacement models weren't selling well. However, with the introduction of models like the Hornet and Transalp, large motorcycle production stabilized, and we regained the number one market share in Europe. We finally had the opportunity to showcase Honda's unique identity. That's why we chose this timing.

W: You've introduced many large-displacement models and regained the top spot in European sales. Is this the culmination, a machine designed to be the ultimate, cutting-edge Honda?
Kus: That's the image. Of course, we put our heart into all the vehicles we've released so far, but those were aimed at exceeding customer expectations based on their needs. That's why they sold well. However, with the V3R, we are striving to express Honda's identity by going far beyond customer expectations.

The V3 Derived from the Ideal Body Package

W: Naturally, you must have considered various options. Besides the V3, what other engine layouts were considered?
Kus: Of course, we considered V4, and Honda has a wide range of engines from single-cylinder to V5 and flat-six. However, the V3R's development didn't start with the number of cylinders in mind; it began with the consideration of the body packaging. To allow everyone to experience the exhilarating acceleration of an electric supercharger, a compact, lightweight, and manageable body was essential. So, what kind of engine would be suitable for that purpose? From that perspective, the V3 layout was ultimately chosen.
W: What are the specific advantages of this V3 configuration? While there are examples of its use in two-stroke racing bikes like the NS500 and its replica NS400R, this is Honda's first foray into a four-stroke V3 engine.

The NS500, Honda's works racer that won its first GP500 title in 1983 with F. Spencer, featured a V3 engine with a 112° bank angle, configured with one cylinder in front and two in the rear, the opposite of the V3R.

The NS400R, released in 1985 as an NS500 replica, had a V3 engine with a 90° bank angle, configured with two cylinders in front and one in the rear, the same layout as the V3R.

Kus: As an engine, it combines the best aspects of V2 and V4. We want to increase the number of cylinders to achieve a high-revving characteristic with a sense of exhilaration. However, fewer cylinders are advantageous for engine lightness, chassis slimness, and compactness. Also, for high-torque vehicles, the front wheel tends to lift, so we want to increase the load on the front wheel, which is easier with a V3 than a V2 or V4. With V4s, increasing output often leads to larger and heavier bodies to improve heat dissipation from the rear bank and rider comfort. This ultimately results in increased rear load.
W: I see. So, the V3R's electric supercharger and V3 engine are a set, inseparable.
Kus: Exactly.

The V3 engine is described as a "best of both worlds" configuration, offering more cylinders than a V2 for high-RPM performance and better front-wheel load distribution than a V4. The electric supercharger is positioned almost directly above the front bank (photo from the 2024 engine announcement).

A Semi-Hybrid with a Dedicated Battery for the Supercharger!

W: The V3R is built around the electric supercharger. While there's no official announcement, one thing is clear: it incorporates a hybrid-like system. Spinning the electric supercharger to generate boost is impossible with a standard 12-volt electrical system. It requires a dedicated high-voltage circuit, and I assume it also has a drive battery to power the motor.
Kus: That's correct.
W: Is it located in the bulge under the seat?
Kus: Yes, it is.
W: It's surprisingly compact, considering that. It only protrudes slightly, about the same as where a normal electrical system would be.
Kus: We aimed to keep it that compact, and it's already running like this.
W: It's clear that you've placed a high priority on lightweight and compactness. However, hybrid systems tend to add weight. Isn't there a slight contradiction in wanting to make it lighter while adding heavy components?
Kus: That's precisely the challenge. That's where the engineers' ingenuity comes into play. We have to incorporate the supercharger and the battery system. It inevitably adds weight. Therefore, we're working hard to reduce weight elsewhere. The adoption of the V3 engine also stems from this effort.
W: I understand. You've mentioned it multiple times, but the V3 wasn't the starting point.
Kus: That's right. Some people might think of a new engine and then consider what kind of models can be built with it. However, for the V3R, we started by thinking about what kind of new experience we could offer customers, and then designed the body package from scratch. Therefore, the V3 engine and the electric supercharger are, in a sense, means to achieve that goal.

The electric supercharger is positioned almost directly above the front bank. The two pipes protruding to the right appear to be for the water-cooled (or oil-cooled) circuit to cool the supercharger.

As mentioned in the text, the electric supercharger requires a dedicated drive battery and high-voltage circuit. These are housed in the slight bulge under the seat. Its compactness is astonishing!

A slight disappointment is that the electric supercharger is not visible unless the handlebars are turned fully. Perhaps a transparent duct option that always shows the supercharger would be desirable!?

Streetfighter First, Then... Naturally Aspirated Version Also Being Tested?!

W: The rear suspension uses Unit Pro-Link. What is the reason for this choice?
Kus: Besides being unique, it also makes the single-sided swingarm more visible. However, if the rear suspension were mounted directly to the frame, there would be no space for the battery system. Since the frame is also mounted to the engine, mounting the suspension directly would put too much stress on the engine. Therefore, we adopted the Unit Pro-Link system as it is structurally sound.
W: I see. Visually, the area behind the rear cylinder is very clean, which also emphasizes the sense of lightness.
Kus: We also considered making the rear exhaust pipes clearly visible.

The swingarm is single-sided and appears to be supported by the engine. The rear shock, likely a Showa BFRC Lite, is a Unit Pro-Link type, not connected to the frame at the top. The bulge for the motor drive battery is located directly above it.

The frame connects to the cylinder heads at the front and rear, and does not have a swingarm pivot mount. This is also likely part of the weight reduction efforts.

W: The V3R is classified as a streetfighter. Why did you choose this genre?
Kus: It's about the feeling of control and manageability when you sit on it. We believe a naked style is advantageous for ease of riding without feeling intimidated. A supersport direction would result in a different kind of machine, and it would defeat the purpose if not everyone could experience it. Therefore, we decided to start with a naked style.
W: "Start with," you say. Does that imply other possibilities?
Kus: You can look forward to it.
W: So, after enjoying the V3 + electric supercharger in a streetfighter form, we can anticipate something more?
Kus: We plan to have various developments.
W: Various! You've repeatedly emphasized that the V3 and electric supercharger are a set, but given it's a new engine, wouldn't a "naturally aspirated V3" also be interesting?
Kus: We are considering such possibilities. I have actually ridden a version without the supercharger, and it's a fun bike in its own right.

While the supercharged engine, promising unprecedented acceleration, is exciting, a "NA version" to enjoy the V3's unique pulse also sounds fun! (Photo from Honda's official PV).

W: Wow, so such a test vehicle actually exists! While the supercharged version is highly anticipated, it will likely be a high-end model in terms of price.
Kus: It probably will be.
W: That's why I think a version that allows a wider range of people to enjoy Honda's meticulously crafted, lightweight, and slim V3 package would be interesting.
Kus: We might consider that.
W: Please do, to broaden the scope of enjoyment.
Kus: To digress slightly, developing new concepts and technologies requires solving numerous challenges, and it's also important for nurturing new leaders and training engineers. Therefore, we intend to continue initiating such challenges and initiatives.
W: Those are very encouraging words that further raise expectations!
Kus: Yes. Please continue to look forward to Honda's large-displacement models.

At the engine announcement in 2024, the extremely slim profile, with fork pitch and frame width being nearly identical, was also highlighted. We hope for variations that leverage this slimness!

W: Understood. Apologies for the scattered conversation, but as a streetfighter, is the V3R primarily targeting the European market?
Kus: We are primarily targeting Europe, but we plan to launch it in the US, Japan, and other developed countries.
W: Then we look forward to seeing a more evolved V3R at this year's EICMA.

Kus: We will do our best to show you an evolved version.
W: We're looking forward to it. Thank you very much!

The anticipation is high for what kind of performance it will deliver!

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