TSP CNC Head Insert – KTM/Husky 125cc TBI Models

This head insert features an improved combustion chamber design that gives more performance throughout the rev range as well as reduced risk of detonation. This insert will fit 2023+ KTM and Husky 125cc TBI models with the stock head or upgraded TSP billet head.


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SKU: HKTBI125.23on Category:


This CNC machined TSP head insert fits KTM and Husky TBI models 2023+, and fits into the stock cylinder head outer part. It is designed to work with the TSP supplied base gasket, and gives a big boost to power throughout the rev range.

You will receive one (1) cylinder head insert for your make/model, a raised base gasket and a cylinder head o-ring and washer kit so you can bolt the TSP insert straight on!

The key TSP insert features are:

  • Improved throttle performance in the whole RPM range
  • Smoother throttle response
  • Improved combustion chamber design that gives more performance from bottom to top
  • Reduced risk of detonation

The TSP inserts are designed to run with the TSP maps/ECU flash.  For best performance gains, we recommend purchasing both the ECU reflash as well as the TSP head/insert.  This can be found as a package on our web site under TSP Power Kits for TBI.  If you are deciding between a TSP Head/insert or an ECU flash, it is advised that you go for our ECU tune first. The ECU flash will enable larger gains than this insert by itself as the TSP ECU tunes offer better fuel, ignition and power valve maps over stock. There are gains to be made by just swapping the insert especially with additional smoothness, but this is best complimented with the ECU flash so you get the most out of the head design. Fitting the TSP ECU Flash and Insert/Head at the same time will offer much better performance gains over stock and the package can be viewed in our ‘Power kits – TBI’ Section.

All TSP mods are designed and dyno tested in-house at TSP so you can be sure you’re getting reliable performance for local conditions.


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Below are the make(s) and model(s) that will fit this part.

Year Make Engine CC Model
Year Make Engine CC Model
2023 Husqvarna 125 TC TBI
2023 KTM 125 SX TBI
2023 KTM 125 XC TBI
2024 Gas Gas 125 MC TBI
2024 Husqvarna 125 TC TBI
2024 KTM 125 SX TBI
2024 KTM 125 XC TBI

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