Select your desired compression ratio from the drop down menu. All designs will work with stock base gaskets and cylinder heights and offer significant improvements over stock heads.
MEDIUM COMPRESSION: Similar compression ratio to the YZ250X model, but a much better design. Gives much smoother power delivery at low/mid revs. Squish clearance is much tighter than stock. Fuel economy is greatly improved over stock. Recommended for most YZ250X owners. Can also be fitted to standard YZ250 models when you want to soften the bottom/mid hit and extend the overrev. If you are chasing a big increase in power on you X model, not just smoothness and fuel economy, then consider fitting the high compression design.
HIGH COMPRESSION: Our standard design for YZ250 models but also can be fitted to YZ250X models if you are chasing a big increase in power. Requires 98 RON fuel. Squish clearance is much tighter than stock. Power delivery is much smoother and broader than a stock YZ250. Gives a very large boost to power everywhere when fitted to a YZ250X. Gives much better fuel economy.
Our new TSP CNC 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 CNC 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 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 SMOOTHER power delivery.
The unique CNC design has been 100% developed, machined and tested in-house at TSP.
These CNC 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.
We can also advise baseline jetting specs to go with your new CNC head. The customer takes all responsibility for ensuring that jetting is appropriate for their riding style and conditions.