Originally Featured In Issue 318 Of Cycle Source Magazine
Article By: Chris Callen Photos By: Josh Elzey
Some builders chase trends. Others chase function. Jason Souza has always chased the idea of building cool stuff that works—and that mindset is baked into everything rolling out of Fault Line Kustoms in Norton, Massachusetts. At 48 years old, Jason has been around motorcycles long enough to know what matters and what doesn’t, and this FXR build proves he’s not interested in easy answers or safe choices.
Fault Line Kustoms officially opened its doors in 2016, but Jason’s road to owning his own shop started long before that. Growing up in a family where motorcycles were just part of life—his father rode, and two out of three brothers still do—Jason was hooked early. Dirt bikes at 13, street bikes by 18, and from day one the motivation was simple: go fast. His first street bike was a 1992 Yamaha FZR750, a machine that says a lot about where his head was at even back then.
Before launching Fault Line, Jason spent nearly a decade working with legendary builder Dave Perewitz, from 2008 to 2016. During that time, he handled final assembly on bikes like Perewitz Pro Street builds, soaking up real-world knowledge that only comes from working at a high level every single day. Perewitz remains Jason’s mentor, and that influence shows—not in copied style, but in discipline, execution, and an understanding that a motorcycle should be more than just shiny parts bolted together.
Jason is largely self-taught when it comes to fabrication and metal shaping. No formal schooling, no shortcuts—just time, trial and error, and a refusal to settle for “good enough.” That approach defines Fault Line Kustoms, where the goal isn’t to build garage art, but purpose-built motorcycles that handle better, brake harder, and go fast.
This particular FXR belongs to longtime friends Bob and Andrea Zeolla of Foxboro, Massachusetts. Jason has built multiple bikes for them over the years, and every project starts the same way: trust. Bob and Andrea give Jason the freedom to push ideas, take risks, and build bikes that challenge both the machine and the builder. Those shared experiences are what Jason says stand out most—every bike they do together creates memories that last longer than any spec sheet.
The spark for this build came when Bob and Andrea decided they wanted to do an FXR and stumbled across a new old stock Corbin Warbird kit. The original plan was to twin-cam it—but that felt too easy. Jason wanted a challenge. That’s when the idea of fitting a Milwaukee-Eight into the FXR chassis took hold, and once that door opened, there was no turning back.
The donor bike was a clean 1992 Harley-Davidson FXR with just 2,000 miles on it, sitting quietly in a friend’s hot rod shop. Jason bought it, cut it up without hesitation, and got to work. All fabrication—cutting, welding, shaping—was handled in-house at Fault Line Kustoms.
At the heart of the bike is a 117-inch M8 built around S&S cases, assembled by Fault Line Kustoms. Screamin’ Eagle pistons and cam, Harley-Davidson heads, a 58mm Harley throttle body, S&S air cleaner, and a Thundermax ignition system keep things modern and tunable. Exhaust duties are handled by a one-off Fault Line Kustoms pipe, built specifically to work with the layout and performance goals of the bike.
Backing it up is a 2022 Harley-Davidson transmission with HHI Hawg Halters mid controls, reinforcing the idea that this FXR is meant to be ridden aggressively—not babied.
The chassis remains stock-rake, stock-stretch FXR, but that’s where “stock” ends. Up front, inverted Suzuki Hayabusa forks are clamped by Brock’s Performance triple trees, bringing serious braking and handling capability. SMT Retro 6 wheels front and rear are wrapped in Metzeler rubber, with Tokico radial-mount brakes and custom Fault Line Kustoms brake components providing the stopping power to match the motor.
Visually, the bike walks a fine line between aggressive and refined. The biggest challenge of the build was getting the fiberglass to fit right and flow cleanly—especially with the Warbird bodywork. The FXR gas tank was modified by Fault Line to add a center rib, echoed again in the narrowed Klock Werks front fender. Out back, the Corbin Warbird rear fender ties it all together.
Paint is Ford Grabber Blue, sprayed in PPG, with base color laid down by Fault Line Kustoms and graphics by Jeremy Seanor in a Lucky Strike–inspired design. There’s no chrome overload here—just clean finishes and purposeful detail. A 1939 Ford taillight, Motogadget Motoscope Pro speedo, Mori Moto headlight, Drag Specialties bars with built-in risers, and a custom seat pan upholstered by Chicks Upholstery finish things off.
From start to finish, the build took eight months, and with an estimated value of $65,000, it stands as a clear example of what Fault Line Kustoms is all about. This FXR isn’t a show-only bike—it’s a rider, built to perform, built to be used, and built without compromise.
For Jason Souza, motorcycles aren’t about hype or chasing the next thing. They’re about building cool machines, pushing himself with every project, and keeping the soul of riding intact. This FXR does exactly that—and then some.
Warbird FXR Tech Sheet
Owner: Andrea Labarbara
City/State: Foxboro, MA
Builder: Fault Line Kustoms
Year: 1992
Model: FXR
Value: $65,000
Time: 8 Months
ENGINE
Year: 2025
Model: S&S M8
Builder: Fault Line Kustoms
Ignition: NAMZ/Thundermax
Displacement: 117”
Pistons: Screamin Eagle
Heads: Harley-Davidson
Carb: H-D 58mm Throttle Body
Cam: Screamin Eagle
Air Cleaner: S&S
Exhaust: Fault Line Kustoms
Primary: Harley-Davidson
TRANSMISSION
Year: 2022
Make: Harley-Davidson
Shifting: HHI Hawg Halters
FRAME
Year: 1992
Model: FXR
Rake: Stock
Stretch: Stock
FORKS
Builder: Suziki Hyabusa
Type: Inverted
Triple Trees: Brock’s Performance
Extension: Stock
WHEELS
Front Wheel: SMT Retro 6
Size: 19”
Tire: Metzeler
Front Brake: FLK/Tokico Radial Mount
Rear Wheel: Star Hub
Size: 18”
Tire: SMT Retro 6
Rear Brake: FLK/Tokico Radial Mount
PAINT
Painter: FLK/Jeremy Seanor
color: Ford Grabber Blue
Graphics: Lucky Strike Design
Type: PPG
Chroming: None
ACCESSORIES
Bars: Drag Specilties
Risers: Built In
Hand Controls: Hawg Halters/MotoGadget
Foot Controls: HHI Hawg Halters Mids
Gas Tank(s): FXR Modified By FLK
Oil Tank: Stock
Front Fender: Klock Werks Modified By FLK
Rear Fender: Corbin Warbird
Seat: FLK / Chick’s Upholstery
Headlight: Harley / Mori Moto
Taillight: 1939 Ford
Speedo: Moto Gadget Motoscope Pro
Photographer: Josh Elzey