Two Stroke Performance

The Ultimate in Two-Stroke Engine Tuning: Why Riders Choose Two Stroke Performance

When it comes to unlocking the full potential of your two-stroke dirt bike, one name consistently stands out in the industry—Two Stroke Performance (TSP). Whether you’re a weekend trail rider, serious enduro competitor, or motocross junkie, TSP has proven to be the go-to destination for riders who want to elevate their performance, reliability, and riding experience.

In this comprehensive blog post, we explore everything TSP offers—from their power kits and ECU tuning systems to stroker kits, cylinder head technology, and full race builds. If you’re passionate about two-stroke bikes and looking to get the most out of your machine, this guide will help you understand why TSP should be at the top of your list.

What Is Two Stroke Performance?

Two Stroke Performance is a specialist tuning and engineering company dedicated to two-stroke dirt bikes. They focus on improving engine reliability, horsepower, throttle response, and overall rideability through a combination of ECU tuning, cylinder modifications, stroker kits, long rod conversions, and custom head technology.

Their reputation has been built on one thing: real-world, dyno-proven results. Unlike generic bolt-on parts or off-the-shelf tunes, TSP products are tested, refined, and tuned specifically for each bike model and fuel type.

TSP Power Kits: Built for Riders Who Demand More

One of TSP’s most well-known offerings is their Power Kits, which are available for both TPI (Transfer Port Injection) and TBI (Throttle Body Injection) bikes.

TPI Power Kits

Available for KTM Group 250 and 300 TPI models (2018–2023), the TSP Power Kit is designed to address the limitations of stock TPI setups. These kits include:

  • Custom TSP ECU maps for smoother power delivery

  • High-compression cylinder head inserts for increased torque

  • Thermostat delete kits to improve engine cooling

  • Idle screw kits for improved tuning flexibility

The results? More torque, better throttle response, and significantly improved rideability in technical terrain—all while maintaining exceptional reliability.

TBI Power Kits

With the release of KTM’s TBI models in 2023, TSP launched a new line of TBI Power Kits for 125, 150, 250, and 300cc engines. These kits are all about raw power and control, helping riders maintain traction and confidence across a wider RPM range.

Each TBI Power Kit includes:

  • Preloaded Vortex ECU or TSP ERM module

  • Cylinder head inserts optimized for race or trail use

  • Optional idle screw kits and oil pump delete options

Whether you race or ride recreationally, the TBI kits offer unmatched gains in throttle response and tunability.

ERM Tuning System: Custom ECU Control in Your Hands

The ERM (ECU Reflash Module) is TSP’s most innovative tool—giving riders the power to adjust their ECU mapping without needing to ship the ECU or visit a workshop.

With this handheld device, you can:

  • Reflash the ECU with custom maps from TSP

  • Select fuel type-specific maps (e.g., 98 RON or race fuel)

  • Adjust idle speed, ignition timing, oil pump settings, and more

  • Monitor throttle position, air/fuel ratios, temperatures, and error codes

The ERM puts factory-level tuning tools into the hands of regular riders, making it ideal for those who ride in changing conditions or want to extract maximum performance.

Cylinder Head Technology: Custom Inserts for Every Riding Style

One of the standout features of Two Stroke Performance’s tuning philosophy is their cylinder head insert system. Unlike generic aftermarket heads that offer a one-size-fits-all approach, TSP designs custom-machined interchangeable head inserts tailored to different fuels, altitudes, and rider preferences.

Why Cylinder Head Shape Matters

The shape and volume of the combustion chamber play a critical role in determining:

  • Compression ratio

  • Squish clearance and angle

  • Detonation resistance

  • Throttle response

TSP leverages years of dyno and field testing to create optimized combustion chamber designs that increase power without sacrificing reliability.

Multiple Options for Every Model

For each major bike model (KTM, Husqvarna, GasGas, and others), TSP offers a range of head inserts, including:

  • Low, Medium, and High Compression Inserts: Matched to your fuel type—whether you’re running 95/98 pump fuel, race gas, or avgas

  • Trail / Enduro Tuned Inserts: Smoother bottom end, ideal for technical riding

  • MX / Race Tuned Inserts: Snappier throttle and increased top-end power

These inserts are manufactured in-house to aerospace-grade tolerances and fitted into billet head shells or OEM-modified heads, depending on application.

Detonation Control and Fuel Flexibility

Each head insert is designed to optimize squish clearance, which is essential for both combustion efficiency and detonation control. With TSP’s head designs, you can:

  • Run higher compression on pump fuel safely

  • Improve throttle response without pre-ignition

  • Easily switch inserts if you change fuels or riding style

This level of modularity and engineering precision is rarely found outside of factory racing teams—but TSP has made it available to the public.

Big Bore, Stroker & Long Rod Builds: More CCs, More Power

TSP doesn’t just stop at mapping and head mods—they also offer stroker and long rod builds that take your engine to a whole new level.

These performance builds include:

  • Stroker crankshafts to increase engine displacement

  • Long connecting rods for smoother torque curves and improved bottom-end

  • Custom porting and cylinder head modifications

  • Precision-machined components using the highest grade materials

For riders chasing horsepower figures over 65–70hp (especially in CR500s, KX500s, and built KTM 300s), these builds deliver real performance gains with proven reliability.

Real-World Examples: Modern Builds That Deliver

Here are some of TSP’s recent modern two-stroke builds and the results they’ve achieved:

2001 Honda CR500

Originally left sitting for over a decade, this CR500 was completely restored and modified with:

  • CNC-machined billet head with correct squish clearance

  • Cylinder porting and reshaping

  • VForce 3 reed block upgrade

  • 38mm PWK carb with custom jetting

  • Output: Over 65 horsepower at the rear wheel

The customer reported that the power delivery was significantly more usable with improved mid-range torque and less violent hit—making the bike faster and safer.

2007 Honda CR285

A +4mm stroker crank, custom head profile, and cylinder mods turned this CR250 into a 285cc powerhouse. TSP tested this bike against a stock CR250 and found:

  • A 5hp gain through the midrange

  • Smoother torque from low RPM

  • Significantly improved top-end over-rev

Perfect for aggressive off-road or MX riders looking for a bigger punch without sacrificing flickability.

KTM 300 TPI & TBI Projects

TSP continues to lead development on the newest generation of KTM and Husqvarna two-strokes. Their testing on 2023+ TBI bikes has resulted in:

  • Dramatically improved bottom-end response

  • Clean running across the entire throttle range

  • More usable torque for both racing and trail conditions

This proves that with proper tuning, modern two-strokes can rival or even exceed their carbureted ancestors in both power and feel.

Why Choose TSP Over Other Tuners?

Here’s what sets Two Stroke Performance apart from generic tuners or bolt-on mods:

1. Dyno-Developed and Track-Tested

Every map, head mod, and component TSP offers has been developed on their in-house dyno and tested in real riding conditions. This ensures the products are more than just theory—they actually work in the dirt.

2. Proven Reliability

Unlike some performance shops that chase high dyno numbers at the cost of reliability, TSP focuses on long-term dependability, especially in enduro and trail riding applications where overheating and fuel issues can ruin a ride.

3. Fuel-Specific Tuning

Whether you’re running 98 RON pump fuel or high-end race gas, TSP offers fuel-specific maps and head profiles to maximize performance while keeping detonation at bay.

4. One-Stop Shop for Two-Strokes

From cylinder head machining to custom jetting setups, ECU flashes, and full engine builds—TSP offers everything under one roof. There’s no need to mix and match services across multiple providers.

Supported Models and Brands

TSP supports a wide range of modern two-stroke bikes, with a focus on KTM Group platforms:

  • KTM 125, 150, 250, 300 TPI & TBI

  • Husqvarna TE, TC, and TX range

  • GasGas EC and MC series

  • Honda CR250, CR500

  • Kawasaki KX250, KX500

  • Yamaha YZ125, YZ250

TSP’s parts, kits, and tuning modules are available via their online store, making upgrades accessible to riders all over Australia and beyond.

Hey, I’m Kane — a hands-on creator, builder, and storyteller behind this blog. Whether I’m deep into a restoration project, sharing workshop tips, or just reflecting on the chaos of running a small business, this space is where I keep it real. I write about what I love, what I learn, and what I’d do differently next time. Stick around for behind-the-scenes updates, hard-earned advice, and the occasional laugh at my own expense.

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