TSP Billet Cylinder Head – Yamaha YZ/YZX 125 – High Compression

TSP Billet Cylinder Head – Yamaha YZ 125 – 2005 – 2021 – High Compression

TSP Billet Cylinder Head – Yamaha YZX 125 – 2020 – 2023 – High Compression


Model Validator

SKU: TSPYZ125H Category:


Please note – For YZ 125 2022+ models, see the correct cylinder head here.

The TSP cylinder head for the Yamaha YZ 125 is higher compression than the stock head but still safe for 91 octane pump fuel with appropriate jetting. It offers improved bottom/mid-range power over the stock head and is best suited to trail riding, offroad racing or MX riders who want max mid-range torque. It is also recommended for the YZ125X model and gives very linear, strong power delivery when the standard YZ125 model power-valve spring is used.

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.

These Billet machined 2 piece heads feature TSP’s proven combustion chamber designs and are a MUST HAVE mod for most current model offroad bikes. Our combustion chamber designs have been used by thousands 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 SMOOTHER power delivery.

The unique Billet design has been 100% developed, machined and tested in-house at TSP.

These Billet heads will bolt onto your standard cylinder and are designed to work with standard base gaskets.

We can 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.

TSP tuned Ignitions are a great addition to the TSP head for the Yamaha YZ 125. The TSP ignitions are available through special order, please give us a call.


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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
2005 Yamaha 125 YZ
2006 Yamaha 125 YZ
2007 Yamaha 125 YZ
2008 Yamaha 125 YZ
2009 Yamaha 125 YZ
2010 Yamaha 125 YZ
2011 Yamaha 125 YZ
2012 Yamaha 125 YZ
2013 Yamaha 125 YZ
2014 Yamaha 125 YZ
2015 Yamaha 125 YZ
2016 Yamaha 125 YZ
2017 Yamaha 125 YZ
2018 Yamaha 125 YZ
2019 Yamaha 125 YZ
2020 Yamaha 125 YZ
2020 Yamaha 125 YZX
2021 Yamaha 125 YZ
2021 Yamaha 125 YZX
2022 Yamaha 125 YZX

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