Royal Enfield's wildest custom competition returns, and Australia is leading the charge.
If you've ever sat in a motorcycle dealership and thought, "I wonder what would happen if you just let these guys go completely off chops with a build budget and six months”, Royal Enfield has your answer. It's called the Busted Knuckles Build-Off, it's now in its third season, and the 2026 edition might just be the best one yet.
Australia holds the honour of being the first global market to host Season III, and five dealerships across the country were handed the keys to one of the most customisation-ready motorcycles on the market today: the Shotgun 650.
The Launch: Where Custom Motorcycles Meet Aviation History
Before we get into the builds themselves, let's talk about the setting, because Royal Enfield didn't just throw these bikes in a showroom and call it a night.
Season 3 of Busted Knuckles Build-Off was launched at Essendon Fields Airport, Melbourne, in an aviation hangar with a vintage Douglas DC-3 sitting in the background behind the five custom builds. If you're going to unveil some of the most ambitious custom motorcycles built in Australia this year, a wartime transport aircraft is not a bad backdrop. Whoever made that call deserves a raise.
The evening also served as the Australian launch of two significant new Royal Enfield models, the Bullet 650 and the Guerrilla 650 Apex which tells you something about how Royal Enfield views this competition. This wasn't a side event. This was a statement. BKBO Season 3 was given the same stage as two major new model launches, and it earned every bit of it.
Now, on to the bikes.
Why the Shotgun 650 Was the Only Logical Choice
Let's be honest. Giving builders the Shotgun 650 as their canvas wasn't a random decision. This is a motorcycle that was designed to be torn apart and rebuilt.
When we sat down with Adrian Sellers, the lead designer of the Shotgun 650, he told us exactly what he'd do if he got his hands on one: "Slam it and stretch it." Push the swingarm out, drop it low, make it mean. That's not a designer talking about a finished product, that's a designer who built in the invitation to customise from day one.
The Shotgun arrived with a strong custom-inspired identity straight from the factory, the cross-spoked tubeless wheels, the piano black finishes, the removable rear seat and rack, the frame loops that nod to Royal Enfield's heritage while pointing somewhere entirely new. In short, it's a brilliant blank canvas.
The Builds
RE1000 — GRID Motorcycles
This is the one. This is the build that made me put my beer down and lean in.
The story behind the RE1000 is as good as the bike itself. Builders Jesse Robinson and Dylan Brown are Gold Coast locals now, but they go back a long way, both originally from Bathurst, NSW, they grew up together as mates before eventually ending up on the same coastline and in the same workshop with the same dangerous ideas.
GRID Motorcycles didn't just customise a Shotgun 650. They built a world-first 1000cc Royal Enfield parallel twin. Working with Jesse, the original 650 engine was transformed internally into a genuine 1000cc powerhouse. Dylan then hand-built almost everything around it, custom chrome frame, custom aluminium tank and fenders, handlebars, grips, triple clamps, the lot.
The inspiration was drag racing culture and Japanese craftsmanship, and you can see both in the finished bike. The lines are perfect. The teardrop tank is stunning. The pipes are a standout.
Now, about that stance. The RE1000 has been well and truly slammed, dramatically lower than the stock Shotgun but here's where it gets interesting. Rather than stretching it out as most builders would, Jesse and Dylan actually shortened the bike slightly. Their reasoning, shared in conversation at the launch, is genuinely clever: when you lower a motorcycle, it automatically looks longer due to the change in proportions. So rather than letting it run long and loose, they tightened it up, keeping the proportions balanced and the silhouette clean. The result is a bike that looks slammed and purposeful without ever feeling gangly.
It's the kind of detail that separates a good custom from a great one.
There is, however, one small detail worth mentioning. The RE1000 has no rear brake. And the front disc is, shall we say, modest in its ambitions. Stopping power is not going to be this bike's forte. But when something looks this extraordinary, when every line is this considered and every fabricated component this beautifully executed, you find yourself caring considerably less about braking distances.
It's worth noting that the Royal Enfield 650 engine is famously over-engineered, something we've touched on in our reviews, so the fact that someone has taken it to 1000cc is less surprising than it might sound. But it's still an extraordinary feat of engineering for a dealership build competition, and the fact that two mates from Bathurst pulled it off in their workshop on the Gold Coast makes it all the better.
The RE1000 is pure 1970s cool with a 2026 engine note that should sound amazing.
Desert Eagle — Moto Machine
Right, so. The guys at Moto Machine built a nitrous-equipped, post-apocalyptic desert bobber inspired by Group B rally cars and Dakar machines, and they named it the Desert Eagle, from a Royal Enfield Shotgun 650. In Australia.
This is either the most unhinged thing in the competition or the most brilliant, and honestly, it might be both. The spec list reads like a fever dream: steel-fabricated fuel tank, tank-mounted ram air intake, NOS system, custom side-exit twin exhausts, three-row LED headlight setup, custom aero discs, YSS rear suspension, and a long list of fabricated, CNC-machined and 3D-printed components.
It's bold. It's loud. It's not everyone's cup of tea and that's precisely what makes it interesting. Naming a custom Shotgun a "Desert Eagle" is a choice, and Moto Machine made it with full confidence. Respect.
Dirty Purdy — MotoMAX Perth
MotoMAX didn't try to reinvent the Shotgun. They tried to turn it up to eleven, and they largely succeeded. The defining feature of Dirty Purdy is its shotgun pipes exiting high and wide at a 45-degree angle, no mufflers, and a sound that presumably announces its arrival several suburbs in advance.
The stance has been reworked too: 40mm lower at the rear, revised shocks, heavier fork oil, and a low-slung seat setup using a Goan 350 rear guard hanger. Finished in raw steel with MotoMAX's signature piston bolt logo, this is a build that commits to a vision and doesn't apologise for it.
Those pipes are the star of the show. Full stop.
Sawn-Off — House of Motorcycles
At first glance, the Sawn-Off looks almost stock. And then you start noticing things.
The XL 10.5-inch rear shocks. The 7/8-inch drag handlebars. The curved number plate frame. The integrated Ellypse run/turn/brake lighting. The Urban Flyscreen. The Black Signature Rider Seat. Each modification is considered, purposeful, and cohesive.
Built in-house by Cam at House of Motorcycles, this is a masterclass in restraint. Sometimes the best custom build isn't the one that screams the loudest, it’s the one where every detail has been thought through and nothing is there by accident. The Sawn-Off understands that completely.
Sometimes a great custom is about keeping it simple. This one proves it.
Spitfire 650 — Fast Fuel Motorcycles
Any motorcycle with intentional flame-throwing exhausts deserves your full attention. The Spitfire 650 has them, and Fast Fuel have somehow managed to keep the whole thing road registrable and street legal. Imagine pulling up at the lights on a Tuesday morning in peak hour traffic and dropping the clutch on this baby. The Uber Eats riders wouldn't stand a chance.
Inspired by the iconic Supermarine Spitfire, the build features afterburner-style flame throwers, ammunition case saddlebags, a custom LED tail strip, hand-brushed bomber teeth clutch cover, candy red powder-coated details, internally wired handlebars, and a sprung custom upholstered seat.
What's clever about the Spitfire is that Fast Fuel haven't strayed far from the original designer's ethos, they’ve enhanced the Shotgun's modern design with personality and detail rather than rebuilding it from scratch. The ammunition case saddlebags in particular are a very cool touch. This is a bike with a story, and it tells it well.
And the Winner Is...
The Expert's Choice award went to the RE1000 by GRID Motorcycles and having seen what Jesse Robinson and Dylan Brown built in that Gold Coast workshop, it's hard to argue with the judges. A world-first 1000cc Royal Enfield twin, hand-fabricated from the ground up, by two mates who grew up together in Bathurst and brought their shared vision to life on the sunny Gold Coast. That's a great motorcycle story, and a deserving winner.
But the People's Choice Poll opens Thursday 21 May and the other four builds have plenty to say about who the public's favourite should be. Head to Royal Enfield's channels to cast your vote.
The Bigger Picture
What Busted Knuckles Build-Off does better than almost any other manufacturer competition is this: it trusts the people closest to the product.
Royal Enfield's dealership network isn't just a sales channel it's full of people who genuinely love motorcycles, who understand their customers, and who have real creative vision. BKBO gives that vision a stage. The fact that five builds based on the same motorcycle can look this wildly different from each other is a testament both to the competition format and to the Shotgun 650 itself as a platform.
The Shotgun was born out of custom culture. It was designed with customisation in mind. And Season 3 of Busted Knuckles has proven, beyond any reasonable doubt, that Royal Enfield got that brief exactly right.
Want to know more about what makes the Shotgun 650 such a compelling custom platform? Check out our interview with designer Adrian Sellers and our full review of the bike on the Biker Torque channel.