TSP Billet Head – Yamaha YZ125 2022-on & YZ125X 2023-on

Please note – For YZ125X 2022 models, see the 06-2021 listing instead. This is to suit YZ125 2022-on models with the new generation engine only.

*** TSP Heads & Inserts now always include Cylinder head O-rings & Washers free of charge! ***

This Billet machined head feature TSP’s proven combustion chamber design and are a must have mod for most current model off-road bikes. Our combustion chamber designs have been used by hundreds of happy customers and have been extensively dyno tested… the gains are consistent and include: increased power throughout the rev range (especially bottom/mid), improved fuel economy, greatly reduced risk of detonation, increased top end life in many models, and much smother power delivery.

This design is slightly higher compression than the stock head but still safe for 98 RON pump fuel with appropriate jetting. It offers improved bottom/mid power over the stock design and is best suited to trail riding, offroad racing or MX riders who want max midrange pull.

The unique Billet design has been 100% developed, machined and tested in-house at TSP. This will have the best performance when paired with our TSP ignition unlocking the true bolt-on power potential.

These Billet heads will bolt onto your standard cylinder and are designed to work with standard base gaskets. If you are unsure of your current base gasket thickness we can advise the correct thickness to achieve the necessary cylinder height and squish clearance.

Our TSP Billet cylinder heads are machined from solid 6061 T6 stock and offer improved performance, reliability and fuel economy. They are the best bolt on mod you can buy for your bike! Our design offers better heat dissipation than many other 2 piece designs due to the large lower section which incorporates the combustion chamber… this allows heat from combustion to disperse over a larger area than other 2 piece designs for improved heat transfer to the coolant.

We will also advise baseline jetting specs to go with your new Billet head. The customer takes all responsibility for ensuring that jetting is appropriate for their riding style and conditions.

Additional information