Tomasin R&D T500 Engine Conversions
T500 Conversions
By Garage Eleven
We turn Honda CRF450 four-strokes into fuel-injected, electric-start 500cc two-strokes using the Tomasin R&D T500 kit — fitted, wired, mapped, and run in properly before it leaves the workshop.
Fuel Injected • Electric Start • Fully Reversible • No Frame Modification
What It Is
A 500 Two-Stroke In A Modern CRF
The Tomasin R&D T500 is a plug-and-play 500cc two-stroke conversion for the Honda CRF450. It drops straight into the standard frame — no cutting, no modification, no fabrication. The whole thing is reversible if you ever want the four-stroke back.
What makes it different to every other big-bore two-stroke build is the electronics. The T500 runs fuel injection and electric start off a dedicated ECU, so you get modern startability and throttle response with genuine 500cc two-stroke torque behind it.
Garage Eleven handles the full conversion — donor assessment, engine build, installation, wiring, ECU setup, and running checks — so the bike leaves here sorted, not half-finished.
Modular billet head, reed valve induction, racing crank and rod, titanium studs, electric water pump, and a dedicated T500 ECU.
T500 Conversion · CRF450 ChassisGarage Eleven SilencerPipe Routing · Hinson ClutchBuilt At Garage ElevenGarage Eleven Conversion Process
Fitted Properly, Not Just Bolted In
You supply a suitable Honda CRF450 donor, or we source one for you. From there we build the T500 engine, install it, set up the electronics, and hand the bike back running and mapped.
01
Donor Assessment
We check the CRF450 over and confirm the parts the conversion reuses are all serviceable before anything gets pulled apart.
02
Engine Build & Fitment
The T500 bottom end is assembled and the complete engine installed into your standard frame with proper alignment and fitment checks throughout.
03
ECU Setup & Run In
Loom, injection, and cooling all commissioned, then the dedicated T500 ECU is set up and the bike started, checked, and run before handover.
Donor Bike & Reused Parts
Honda CRF450 Platform
The T500 is built around the Honda CRF450. The conversion reuses a number of components from your donor bike, which keeps the kit cost down and the fitment exact.
Carried over from your CRF450: starter motor and gears, ignition (flywheel and stator), primary gears and complete clutch, gear selector and lever, stator and clutch cases — and the complete gearbox if you go with the gearbox-less kit option.
- Honda CRF450 donor bike required
- No frame modification needed
- Fully reversible conversion
- Fuel injection and electric start
Conversion Options
T500 Pricing
Three ways to get into a T500 — supply your own bike and have us fit it, buy the kit and build it yourself, or have us deliver a complete bike ready to ride.
Convert Your CRF450
$22,500
You supply the donor bike
We fit the T500 conversion to your Honda CRF450 and complete the bike as a running, mapped 500 two-stroke.
- T500 kit supplied and fitted
- Engine built and installed
- Loom, injection, and cooling commissioned
- ECU setup and run in
- Your CRF450 gearbox reused
Kit Supply Only
$19,990
Kit supply, you build it
For experienced builders who want to handle their own installation. Australia-wide shipping available.
- Complete T500 conversion kit
- Dedicated ECU and remote support
- Pipe, silencer, and manifold included
- Gearbox option available
- Contact us to confirm lead time
Complete Turnkey Build
From $34,900
We supply everything
We source the donor, build the engine, complete the conversion, and hand over a finished bike ready to ride.
- Donor CRF450 sourced by us
- Full T500 conversion completed
- ECU setup and run in
- New donor builds from $41,900
- Build slots limited — enquire early
Competition use only. The T500 is designed for closed-course competition motorcycles. It is not ADR compliant and cannot be road registered in Australia. If you are after a road-legal big two-stroke, take a look at our Road Legal CR500E instead.
Start The Conversation
Enquire About A T500 Build
Tell us what you have and what you are after. We will come back with options, lead time, and what your donor needs.
T500 Build Enquiry
Include your CRF450 year and model if you already have one, or let us know if you want us to source a donor.
The Result
500cc Two-Stroke, Modern Manners
Big-bore two-strokes have always come with a trade-off — brutal power, but kickstarting, jetting, and temperament to match. The T500 removes most of that without softening what makes a 500 special.
500cc
Big-Bore Torque
The pull and the hit of a genuine 500 two-stroke, in a chassis that already handles.
EFI
Injection & E-Start
Push-button starting and no jetting chase. Consistent from a cold morning to a hot moto.
G11
Garage Eleven Built
Fitted, commissioned, and set up by a workshop that lives and breathes two-strokes.
Want To Build A T500?
Whether you have a CRF450 sitting in the shed or want us to build one from scratch, get in touch and we will talk you through the options, lead times, and what your donor needs.
Pricing is indicative and may change with kit supply, exchange rates, freight and import costs, donor bike condition, parts availability, and final scope. Closed-course competition use only — not ADR compliant and not road registrable. Contact Garage Eleven to confirm current pricing and availability.
