Built by Engineers. Trusted by Riders Who Care About the Details.
Two-stroke builds demand precision. Fitment, geometry, reliability, and performance all matter â and thereâs no room for shortcuts.
Your Bike Deserves More Than Guesswork
Two Strokes Only exists to keep modern and classic two-stroke machines alive using engineering, proven fabrication, and hands-on expertise. From high-value conversion builds to routine maintenance parts, everything we supply is designed or tested by us!
The Two-Stroke Story
The Problem: Keeping Two-Strokes Alive Isnât Easy
As two-stroke platforms age, quality parts disappear. Fitment becomes inconsistent. Knowledge fades. Riders are left choosing between outdated components or questionable aftermarket solutions that compromise performance and reliability.
The Solution: Engineering-First Two-Stroke Development
TSO was created to solve that problem properly.
Founded in San Diego by Luke Arana, Two-Strokes Only applies modern engineering methods to classic machines â combining 3D scanning, CAD modeling, simulation, reverse engineering, and rapid prototyping to develop parts and complete builds that fit correctly and perform as intended.
The Outcome: Better Parts, Better Builds, Longer Life
Lukeâs background designing high-performance components for Camburg Engineeringâs Kinetik series race trucks shaped TSOâs philosophy: precision first, aesthetics second, and zero compromises on quality.
The result is two-stroke parts and builds that feel modern without losing their soul â improved fitment, refined handling, and confidence every time you ride.
No Matter What Your Needs Are
Two-Strokes Only was founded to keep legendary 500cc and vintage two-strokes alive through modern engineering, hands-on fabrication, and obsession-level design. While our in-house manufacturing remains dedicated to elite billet accessories, rare conversion kits, and race-grade components, weâve evolved into a total resource for the two-stroke community. By partnering with major distributors like Parts Unlimited and WPS, we provide builders and riders with a seamless one-stop shopâsupplying both our proprietary custom creations and the complete array of everyday aftermarket maintenance and replacement parts necessary for any full-scale restoration or garage build.
Not Just Another Shop. Not Just Another Parts Brand.
This isnât just another moto brand. Itâs purpose-built for riders who care.
What makes Two Strokes Only different:
- Engineering-led development: Every TSO brand product starts in CAD, not guesswork
- In-house everything: design, fabrication, testing, and refinement
- Conversion expertise: geometry, tolerances, and system-level thinking
- Build-first mindset: parts are proven on real bikes, not just sold
- Hands-on support: guidance before, during, and after purchase
Built by People Who Ride What They Create
TSO isnât a factory. Itâs a hands-on operation led directly by the people designing and building the parts.
Luke and the team are involved in every step, from concept to final fitment. That means real accountability, honest recommendations, and a level of care you wonât find in large-scale manufacturing.
Proven on Real Builds. Trusted by the Community.
TSO builds and components have been featured in high-profile projects and trusted by riders who demand excellence and custom restorations that push whatâs possible with vintage platforms.
Unsure About Fitment or Complexity? Thatâs Where We Help.
Two-stroke projects can feel overwhelming. We make them manageable.
- Fitment guidance before you buy
- Clear recommendations based on your platform and goals
- No pressure, just honest expertise
- Support throughout the process
If something isnât right for your build, weâll tell you.
