This 43mm throttle body assembly is intended for KTM 250 TPi, KTM 300 TPi and model year 2017 onwards BRC500 applications, where it increases airflow and repositions the injectors to deliver fuel at an improved angle. In practical use, it is designed to improve throttle response, power output, starting, bottom-end lubrication and running temperature control, while also giving cleaner routing for engine bay wiring and fuel lines. Safe operation requires a TSP reflash or GET ECU, and installation requires selected parts from the original throttle body to be transferred to the new assembly.
Features
Improved throttle response
Increased power output
Improved bottom-end lubrication
Lower running temperatures
Easier starting
Injector relocation for cleaner engine bay wiring
Injector relocation for neater fuel line routing
Designed to match reed valve flow
Supports pre-mix operation
Specifications
Throttle body diameter: 43mm
Baseline idle air screw setting after installation: 3.5 turns out from fully seated
Kit Contents
Larger throttle plate
Injector port plugs
O-rings
Two injector harness extension cables for applications requiring additional injector lead length
Installation Notes
OEM fuel rail and cylinder-mounted injectors are removed during installation
Cylinder injector ports must be sealed using the supplied injector port plugs and O-rings
The original fuel injectors are reused and installed into the throttle body assembly
The tank-to-fuel-rail quick-disconnect section from the original fuel hose is reused
OEM throttle position sensor, cold-start plunger, idle air screw, throttle shaft and throttle-shaft seals are transferred from the original throttle body
The stock throttle-shaft butterfly slot must be enlarged to accept the supplied larger throttle plate
For 2017 to 2019 KTM models, later-model KTM idle screw and cold-start plunger/button are required
Cross-Reference OEM Part Numbers
KTM idle screw: 55741060000
KTM cold-start plunger/button: 55741070000
Vehicle Fitments
KTM 250 TPi, all TPi models
KTM 300 TPi, all TPi models
BRC500, model year 2017 onwards
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