TSP Power Kit Carb – Sherco 300cc

TSP Power Kit – Sherco 300 SE – for model year 2018+. Extra TSP inserts are discounted down from $150 to $120 when ordered with a TSP Power Kit (The TSP power kit head already includes an insert). This gives you the option to run two different compression ratios for different riding styles and elevations. Make your selection by clicking the button below labeled “Select Options – Required to Continue”.


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This package will transform the power delivery of your Sherco 300. It will fit the Sherco 300 SE Factory Models 2018+ and Sherco 300 SE Racing Models 2019+.

The kit includes the following:

  • A new 2 piece TSP Billet machined cylinder head with a replaceable combustion chamber insert in Low, Medium, or High Comp. See below for more detailed explanations of each compression ratio.
  • Re-flashing of your STOCK ECU with improved ignition and power valve maps developed by TSP. We modify both Map 1 and Map 2, with a more noticeable difference between the maps compared to the stock maps. Map 1 is the fully tuned map delivering maximum performance. Map 2 has a softer power delivery for technical riding or very slippery conditions.
  • A new NGK spark plug, better suited to the improved power the engine makes with this kit
  • A new carb needle which provides much better fueling at part throttle than any of the needles in the stock spares kit. We will also provide a starting guide for the main jet and pilot jet. The original spares kit should contain the necessary main and pilot jets required to jet your bike to suit the TSP Power Kit. If you don’t have the original jet kit and need main and pilot jets then just ask and we can add them to your order.

This package makes a huge difference to the Sherco 300 and offers the following gains over a stock bike:

  • Much more torque at low/mid revs, where you need it most.
  • Drastically improved 0-1/2 throttle performance.
  • 2 ignition maps: hard and soft. The stock map switch works like normal to select between the customized maps.
  • Much smoother, crisper power deliver which is easier to get to the ground.
  • Much less ‘pipe bang’… this is the annoying “dang, dang, dang” noise the engine makes on deceleration. Its generally harmless but very annoying and makes some stock bikes unpleasant to ride at times.
  • Better throttle response.
  • Better fuel economy.
  • More peak power and overrev.
  • You can ride in a higher gear with lower revs in many situations and use the extra low end torque to get you places with less wheel spin and much less clutch work.

This package has been tested and raced by some of the best riders in the world and the feedback has been excellent. Everyone from factory level riders to weekend trail riders have reported a significant increase in performance and rideability.

There is no change to reliability with this setup. The ignition maps, air fuel ratios and combustion chamber designs are similar to those we have run very successfully for years on modified carb models, as a result we know exactly what it can or can’t handle in terms of performance mods.

In order to change the stock ECU data we have spent hundreds of hours developing our own process for accessing, changing and reloading the ECU data. TSP was the first to develop a tuned package for the TPI bikes and now we are the first to develop a package for the the Sherco’s as well.

All ECU features work normally after the re-flash. There are no issues with hard starting and no need to tune via apps or software… just install and ride!

The head and ECU re-flash give a much bigger gain in performance than any aftermarket exhaust can offer, and there’s no trade off by taking power from one area to improve power in another, as usually happens with pipes and some other bolt on parts.

If ordering the additional insert, please include which compression type you’d like in the order notes. These are normally $150, but only $120 if bought at the same time as the TSP Package. The new style of TSP head makes swapping of different compression heads a breeze. The additional insert means that if you planned to ride higher elevation, extreme enduro or even deep sand riding, you can have a spare combustion chamber to switch before the ride.

Combustion chamber designs:
LOW COMPRESSION – This head was designed to suit extreme enduro riding or for riders who are more interested in smoothness of power delivery over power gain. It offers stronger bottom end torque than stock with a very smooth delivery that wont 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 better bottom and mid power and a gain up top as well. The power delivery is much stronger and more tractable than stock and suits a wide range of riding conditions. Works with 91 octane fuel.

HIGH COMPRESSION – This head suits riders who want harder hitting power everywhere, especially down low, and are happy to sacrifice some overrev to achieve this. It completely transforms the bike into a weapon, but can be a handful in some situations at sea level. It can also be used at higher elevation (above 4,500 ft) to achieve a similar power delivery to the medium compression head at sea level. Must use with 91 octane fuel or higher at sea level. We don’t recommend using this design for extreme enduro due to the increased tendency to overheat in very tight, technical riding near sea level, or for high revving applications like desert racing or supermoto. Best to use the low or med designs for those applications.

Below are the make(s) and model(s) that will fit this part.

Year Make Engine CC Model
Year Make Engine CC Model
2019 Sherco 300 SE Factory
2020 Sherco 300 SE Factory
2020 Sherco 300 SE Racing
2021 Sherco 300 SE Factory
2021 Sherco 300 SE Racing
2022 Sherco 300 SE Factory
2022 Sherco 300 SE Racing

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