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: Recommended for YZ250X models. Similar compression ratio to stock YZ250X head but with a much better design. Works fine with 95 or 98 RON fuel. Gives smoother and more predictable power delivery at low/mid revs. Squish clearance is much tighter than stock. Fuel economy is greatly improved over stock.
HIGH COMPRESSION: Recommended for YZ250 motocross models. Requires 98 RON fuel. Similar compression ratio to a stock YZ250 but with a much better design. Squish clearance is much tighter than stock. Gives better pull out of corners and more power throughout the rev range than the stock head. Will overheat more easily in tight conditions. Drastically improves top end life on hard ridden bikes.
Our new TSP ‘Black Series’ cylinder heads offer improved performance, reliability and fuel economy. They are the best bolt on mod you can buy for your bike!
These sand cast one-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 one piece design offers better heat dispersion throughout the casting than common aftermarket 2 piece designs. This means improved heat transfer to the cooling system, improved reliability and less risk of overheating. The ‘Black Series’ coating also offers a tough chip resistant layer that resists weathering and solvents and makes your engine stand out!
Black Series 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 ‘Black Series’ head. The customer takes all responsibility for ensuring that jetting is appropriate for their riding style and conditions.