Garage 11 — Conversions Programme
KX500AF Conversion
Kawasaki’s legendary KX500 two-stroke, dropped into a modern 2024 KX450F chassis using a fully bolt-in, fully reversible conversion kit. Big-bore two-stroke power, current-generation handling.
1986+ KX500Donor engine range
2024 KX450FModern donor chassis
Bolt-In100% reversible kit
What It Is
Two-Stroke Muscle, Modern Chassis
The KX500 was Kawasaki’s big-bore two-stroke weapon, produced right through until 2004 — a raw, torquey machine that built its reputation in desert racing and open-class motocross. The KX500AF takes that engine and fits it into a current 2024 KX450F chassis, giving you the two-stroke hit with modern suspension, brakes and ergonomics underneath it.
Unlike some big-bore conversions that require permanent, invasive changes to the donor frame, the kit we use is designed to be 100% bolt-in and fully reversible — the chassis isn’t cut or permanently modified to accept the engine.
A 1986+ KX500 engine, a 2024 KX450F chassis, and a kit built specifically to join the two properly — no cutting, no permanent modification.
What’s Involved
The Conversion Kit
The frame conversion kit fitted to your KX450F chassis includes the hardware needed to mount the KX500 engine properly and cool it correctly using the factory radiators.
- Billet Y-piece
- Billet upper and lower motor mounts
- Billet cylinder head stays
- Mandrel-bent frame rails
- Cooling line kit — runs both factory 2024 KX450F radiators in series, standard KX500 configuration
Intake boot and rear shock work to suit the OEM airbox are handled separately as part of the build, along with engine service and running setup once the kit is fitted.
Garage Eleven Conversion Process
Fitted Properly, Not Just Bolted On
We handle the fitment, engine service, and final setup so the bike leaves as a running KX500AF — not just a kit bolted to a frame.
01
Donor Check
We confirm your KX450F chassis and KX500 engine are suitable for the conversion before work begins.
02
Kit Fitment
The bolt-in conversion kit is fitted with proper mechanical care — mounts, cooling lines and alignment checked throughout.
03
Engine Service
The KX500 engine is gone through and serviced so it’s ready to run reliably in its new home.
04
Running Setup
Started, checked and set up before handover — carb, cooling and running checks all confirmed.
Who We Work With
Kit Supplier
Two Strokes Only
We use Two Strokes Only’s bolt-in KX500/KX450F frame conversion kits for this build — purpose-built billet hardware for joining the KX500 engine to the modern KX450F chassis.
Building A KX500AF?
Pricing depends on the condition of your donor chassis and engine, and whether you’re supplying a running KX500 or need it built up from scratch. Tell us what you’re working with and we’ll map out the build and cost.
