TSP CNC Head – 2018-2021 Beta 300cc Models

The head comes complete with your choice of compression insert and a complete head gasket kit. TSP additional Inserts are discounted down from $170 to $150 when ordered at the same time as a TSP complete head. Make your selection by clicking the button below labeled “Select Options – Required to Continue”.


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SKU: HKB300.18-21 Category:


This head will fit Beta 300 RR, RR Race, and RX 2018-2021 Models (not 2022+)

All TSP heads and inserts now include a complete head gasket kit including inner and out cylinder o-rings and head bolt crush washers. Everything you need to install your new TSP head or insert with all new o-rings and seals.

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.

LOW COMPRESSION – This head was designed for extreme enduro riding or for riders who are more interested in a smoother and softer power delivery. It offers moderate bottom end torque with a very smooth delivery that won’t break traction too easily. It enables the rider to use lower revs and less clutch when tackling hard obstacles. The low comp design also offers maximum resistance to overheating in tough situations.

MEDIUM COMPRESSION – This head  suits the majority of trail riders and racers who want more bottom end and mid-range power gains, but still allowing the 300 motor to spin up freely with improved over rev up top.   The power delivery is much stronger and more tractable than stock and suits a wide range of riding conditions. Designed for 91 octane fuel.

HIGH COMPRESSION – This head is for riders who want harder hitting power everywhere, especially down low. It completely transforms the bike into a weapon. Also a good fit for normal trail riders who want the  same characteristics as a medium compression head, but in higher elevations around 4000+ feet or higher. OK to run with 91 octane fuel at sea level for trail riding and technical single track.  Aggressive riding in deep sand tracks or WOT desert racing at sea level might require a mixture of race fuel with the high comp head.

Our new 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!

These Billet machined  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.


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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
2018 Beta 300 RR
2018 Beta 300 RR Race
2018 Beta 300 RX
2019 Beta 300 RR
2019 Beta 300 RR Race
2019 Beta 300 RX
2020 Beta 300 RR
2020 Beta 300 RR Race
2020 Beta 300 RX
2021 Beta 300 RR
2021 Beta 300 RR Race
2021 Beta 300 RX
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