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IT'S BUILD SEASON

Upgrade Your Bike This Summer

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Your Two-Stroke Parts Specialist

Highly engineered components, engine conversion kits, and everything else for your two-stroke build

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Ivan Ramirez x TSO

When a pro rider builds a classic, they don't cut corners!

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Factory Level Engineering

We use the same tools and processes as any factory level or OEM program

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Maxima Lubricants

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Connecting Rod Kit Yam

Engine

Drivetrain

Drivetrain

Chassis

Chassis

Exhaust

Exhaust

Intake

Intake

KX250 Frame Conversion Kit: 2011-2016 KX250F Chassis

Conversion Kits

Suspension

Suspension

Controls

Controls

Brake Parts

Brake Parts

Electrical

Electrical

Tires and Tubes

Tires and Tubes

Fluids and Lubricants

Fluids and Lubricants

Two-Stroke Single-Cylinder Crankshaft Rebuilding Service

Engine Services

What We're Known For...

Exceptional attention to detail, and those hard to find parts!
🏁Two-Strokes Only🏁

1989-2001 Honda Cr500 Billet Clutch Cover Kit

from $540.00
🏁Two-Strokes Only🏁

1989-2001 CR500 Billet Coolant Inlet Elbow

$55.00
🏁Two-Strokes Only🏁

1986-2001 Honda CR500 Billet Cylinder Head Kit

$625.00

🏁Two-Strokes Only🏁

2017-2025 Honda CRF450r/CRF250r Billet Gas Cap

$120.00
🏁Two-Strokes Only🏁

2021-2026 CRF450r CR500 Engine Conversion Kit

$2,475.00
🏁Two-Strokes Only🏁

1983-2001 Honda CR500 Reed Spacer (10mm) | The Torque Monster Kit

$39.00
🏁Two-Strokes Only🏁

TSO 18MM Universal Coolant Y-Pipe

$24.00

🏁Two-Strokes Only🏁

2021-2025 CRF250r/CRF450r Fuel Pump Block-Off Kit

from $129.00
🏁Two-Strokes Only🏁

2021-2026 CRF450 CR500 Conversion Exhaust Bracket Kit

from $55.00

🏁Two-Strokes Only🏁

2021-2026 Honda CRF Conversion Airbox

$650.00
🏁Two-Strokes Only🏁

Two-Strokes Only 2026 Honda CR500

from $22,000.00
Pro Circuit

1989-2001 Honda Cr500 Pro Circuit 304 Silencer

$205.95
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Shop Our Complete Engine Kits

  • Sold Out
Vertex

Vertex Wrench Rabbit Complete Engine Rebuild Kit (WR101-082) | Yamaha YZ250/X (03-24)

$719.00

  • Sold Out

Engine Rebuild Kit Garage Buddy Hon
WISECO

Wiseco Complete Engine Rebuild Kit (PWR177-100) | Honda CR125R (05-07)

$588.95
Vertex

Vertex Complete Engine Rebuild Kit +0.5mm OS Piston (WR00018) | Honda CR500R (89-01)

$920.95

  • New
VERTEX

Vertex Complete Engine Rebuild Kit (WR101113) | Kawasaki KX250 (98-01)

$867.95

  • Sold Out

Engine Rebuild Kit Garage Buddy Suz
WISECO

Wiseco Complete Engine Rebuild Kit (PWR135-100) | Suzuki RM125 (04-10)

$588.95

  • New

Complete Engine Rebuild
VERTEX

Complete Engine Rebuild

$1,225.95

  • New

Complete Engine Rebuild Kit Os Piston +0.5mm Hon Complete Engine Rebuild Kit Os Piston +0.5mm Hon
VERTEX

Complete Engine Rebuild Kit Os Piston +0.5mm Hon

$920.95

  • New

WISECO Engine Rebuild Kit - 65.50 mm - Yamaha YFZ350 Banshee PWR100-655
WISECO

WISECO Engine Rebuild Kit - 65.50 mm - Yamaha YFZ350 Banshee PWR100-655

$1,132.95

  • New

WISECO Engine Rebuild Kit - 65.00 mm - Yamaha YFZ350 Banshee PWR100-650
WISECO

WISECO Engine Rebuild Kit - 65.00 mm - Yamaha YFZ350 Banshee PWR100-650

$1,099.95

  • New

Complete Engine Rebuild Kit Ktm
VERTEX

Complete Engine Rebuild Kit Ktm

$1,052.95

  • New

Complete Engine Rebuild Kit Os Piston +0.5mm Hon Complete Engine Rebuild Kit Os Piston +0.5mm Hon
VERTEX

Complete Engine Rebuild Kit Os Piston +0.5mm Hon

$737.95

  • Sold Out

Complete Engine Rebuild Kit Os Piston +0.5mm Kaw Complete Engine Rebuild Kit Os Piston +0.5mm Kaw
VERTEX

Complete Engine Rebuild Kit Os Piston +0.5mm Kaw

$594.95

  • New

Complete Engine Rebuild
VERTEX

Complete Engine Rebuild

$1,225.95

  • New

Complete Engine Rebuild
VERTEX

Complete Engine Rebuild

$1,225.95

  • New

Complete Engine Rebuild
VERTEX

Complete Engine Rebuild

$1,225.95

  • New

Complete Engine Rebuild
VERTEX

Complete Engine Rebuild

$1,225.95

  • Sold Out

Complete Engine Rebuild Kit Pol Complete Engine Rebuild Kit Pol
VERTEX

Complete Engine Rebuild Kit Pol

$1,448.95

  • Sold Out

Engine Rebuild Kit Garage Buddy Kaw
WISECO

Wiseco Complete Engine Rebuild Kit (PWR128-100) | Kawasaki KX250 (02-03)

$710.95
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Ryan Surratt aboard our shop CR500 at the 2026 Two-Stroke Nationals!

TESTED BY KAPLAN CYCLES

ENDORSED BY IVAN RAMIREZ

FEATURED IN MOTOCROSS ACTION MAGAZINE

Masters of Our Craft

Every TSO product and service is developed using real-world testing, modern engineering tools, and hands-on build experience.

About Us

Global Shipping

Whether you're in the US or overseas, we get you your parts fast so you can get back on the pipe

Engineering-Driven Design

We don’t resell parts… We design components to solve real conversion challenges.

Expert Support

Questions about fitment or compatibility? Our team helps you get it right the first time.

Race-Proven Services

From cylinder work to full conversions, our services are built for real-world performance.

San Diego, California

4747 Oceanside Blvd.

Unit G
Oceanside, CA 92056

(707)-813-1560
luke@twostrokesonly.com

Monday - Friday, 7:00 to 4:00
Saturday-Sunday, Closed