KUSTOMFEST Cub Class Winner: “Guillotine” from Raphael Oktavanka, his brother, and his father…
In the custom world, especially in Southeast Asia, a “sleep-engine” build refers to a skeletonized drag bike with a modified horizontal engine that looks like it’s “sleeping” (lying flat) rather than upright. Small underbone bikes like the Honda Super Cub, C70, and Yamaha Jupiter are the most common donors for these builds. In Indonesian drag racing, mesin tidur (sleep engines) often compete in a different class than mesin tegak (“standing” or vertical engines). These low-slung, Cub-powered drag bikes have become very popular in racing and custom scenes.
Back in 2024, we featured a Kustomfest-winning sleep-engine café racer “Resurrection” from motorcycle designer Radite Octavanka of RAXE97, who built the bike in collaboration with his father, owner of the custom motorcycle and paint workshop 69NERAKATAU INC. — a family affair.
Now Radite’s younger brother, Raphael Dimitry Oktavanka (@lear_seven), has popped up with a build of his own…and it’s a mind-melter. The donor is a 1989 Honda Astrea Prima — part of the Honda Cub lineage — which Raphael got from his old man back in high school.
Though he’d made many modifications over the years, Raphael had kept the basic shape and silhouette largely unchanged…until his older brother encouraged him to break the mold.
“The concept took root back in 2023, sparked by unique Japanese custom sleep-engine builds that inspired the aggressive, low-slung riding position of the Guillotine. For the front end, my inspiration came straight from Burt Munro’s legendary machine in the film The World’s Fastest Indian. The striking look of its leaf-spring suspension caught my eye, making the front section look undeniably cool while lending the build a luxurious, classy aesthetic.
Blending the invaluable guidance and inspiration from my brother and father with my own vision, we spent roughly a full year of dedicated craftsmanship turning concept into metal.”
Yes, this is a truly family-built machine, and vision and craftsmanship are stunning. Only the engine from the donor bike was retained. The Oktavanka boys fabricated a custom frame from scratch, equipped it with that super-cool stainless leaf-spring fork, and outfitted the bike with an 18-inch six-spoke Honda Tiger front wheel and a 17-inch Yamaha Scorpio rear.
The custom dual-carb intake comes from RAXE97. The handlebars were scratch-built, as was the stainless steel exhaust, footpegs with wood accents, and the sheetmetal bodywork, which is finished a lovely candy blood-red that helps lend the bike its name: “Guillotine.”
“Gazing upon it is like staring at a razor-sharp blade ready to drop. Bold, striking red fuses with a lean and wild boardtracker silhouette — the Guillotine wasn’t built merely to ride, but to slice through the silence with the roar of its engine.”
Some may express skepticism at the riding position, but Raphael says it’s very comfortable for him.
“Since this bike was built specifically for me, it actually feels pretty comfortable — though it’s definitely not designed to be a daily commuter. Ultimately, that’s the core philosophy of custom motorcycles: one man, one bike. It’s tailored strictly to its owner.”
The Guillotine made its official debut on the showroom floor at KUSTOMFEST 2026, where the hard work of Raphael, his brother, and his father culminated in “Guillotine” taking home the championship title in the “Choppy Cub” class judged by Minoru Watanabe (@fatechpower).
A massive congratulations to the Oktavanka trio, especially Raphael for realizing his personal ambition to break the mold. He’s designed and built a boardtracker concept that stands a cut above the “sleep engine” builds that fill the custom scene today. What’s more, we love to see a family working together in the garage, keeping up the legacy of craftsmanship, vision, and perseverance.
Below you’ll find our full interview with Raphael about the build, including more photos courtesy of @aragakishot_ and KUSTOMFEST.
Honda Cub Boardtracker: Builder Interview
• Please tell us a bit about yourself, your history with motorcycles, and your workshop.
My name is Raphael Dimitry Octavanka, also known as @lear_seven. I’m the younger brother of @raxe97ninetyseven, and we happen to share the exact same passion.
The story of this bike began in high school when I got it from my dad. Over time, I made numerous modifications, though its core shape stayed pretty much the same. That’s when my brother pushed me to break the mold and create something truly unique — and that’s how this build came to life.
This project was built at my dad’s workshop, @69nerakatau. Ultimately, it came together through a close collaboration between my brother, my dad, and myself — a true family project.
• What’s the make, model, and year of the donor bike?
Honda Astrea Prima 1989.
• Why was this bike built?
Because personal ambition comes from within.
• What was the design concept and what influenced the build?
The initial concept was simply to build a standard choppy cub or street cub. However, with input and direction from my brother — who is a motorcycle designer — we pushed the design into something rarely seen.
Gathering references from across the web, we first locked in the motorcycle’s overall silhouette before moving into precise 3D modeling. Utilizing 3D renders allowed us to accurately simulate the proportions from screen to physical build, ensuring every scale matched our vision.
• What custom work was done to the bike?
We only retained the engine for this build, as keeping the original frame didn’t align with our overall concept. Instead, we fabricated a custom rigid frame from scratch.
To reinforce the boardtracker aesthetics, we equipped the front end with a polished stainless steel leaf-spring fork. The handlebars were custom handmade, paired with an 18-inch 6-spoke Honda Tiger front wheel and a 17-inch rear wheel utilizing a Scorpio drum brake setup, both wrapped in Swallow Classic tires.
The sheetmetal bodywork was finished in a vibrant candy red. Rounding out the custom details are handmade stainless steel footpegs with wood accents, a custom stainless exhaust, and a signature raxe97 custom dual-barrel carburetor intake setup originally sourced from a Honda Rebel 250.
• Does the bike have a nickname?
“GUILLOTINE.”
Gazing upon it is like staring at a razor-sharp blade ready to drop. Bold, striking red fuses with a lean and wild boardtracker silhouette — the Guillotine wasn’t built merely to ride, but to slice through the silence with the roar of its engine.
• Can you tell us what it’s like to ride this bike?
My friends often complain that the riding position is way too extreme for them. But since this bike was built specifically for me, it actually feels pretty comfortable — though it’s definitely not designed to be a daily commuter. Ultimately, that’s the core philosophy of custom motorcycles: one man, one bike. It’s tailored strictly to its owner.
• Was there anything done during this build that you are particularly proud of?
This is my very first fully proper — and honestly, quite extreme — custom build. Seeing it finally finished was a deeply proud moment for me. For me, the best part of building a custom bike is always the process: taking an idea from a simple concept, bringing it to life, and actually riding it. That alone is more than enough, and I couldn’t be prouder.
Follow the Builders
Owner: @lear_seven
Designer: @raxe97ninetyseven
Builder: @69nerakatau
Support: @alfaglos
Photos: @aragakishot_ @kustomfest
