300TPI 2020 Power Kit Dyno Curves
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TSP Power Kit – 2020+ KTM, Husky & Gas Gas 300 TPI

38 reviews Add your review

This is the ONLY complete solution currently for sale on the market that addresses all the necessary TPI issues – head, ignition and fuel. It is also the MOST COST EFFECTIVE solution by far. All other solutions are either more expensive or only tackle part of the problem. In order to address all the necessary issues using other parts you would need a programmable ECU, an aftermarket head, a new plug and an idle screw.  Buying all these separately adds up to roughly twice the cost of our package! Watch the Power Kit Install Video here.


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Top End Rebuild Kit
TSP TPI Injector Relocation Kit
Crank Case Pressure Sensor
SBMP Oil Pump Delete Kit
tpi fuel filter kit
aluminum fuel tank fitting
twin air filter
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TSP CNC Head Insert – 2019+ KTM/Husky/GasGas 300 TPI Models
Original price was: $170.00.Current price is: $150.00.
Your bike's VIN# is needed for all ECU Re-flashes. Typically 17 characters and can be found on the bike's frame steering tube or registration/pink slip.

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TSP Power Kit 300 TPI

The TPI Power kit package will transform the power delivery of your 300 TPI.  The Power Kit includes the following:

  • A 2 piece TSP CNC machined cylinder head in Low, Medium, High or Very High compression.  See below for more detailed explanations of each compression ratio.
  • TSP heads include a complete head gasket kit
  • Reflashing of your STOCK ECU with improved fuel, oil and ignition 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. Both maps have more oil everywhere compared to stock. Map 1 is the fully tuned map delivering maximum performance. Map 2 has less ignition advance and more fuel than Map 1 and is softer everywhere. Map 2 is the ‘safe’ map we suggest using for prolonged high speed riding, deep sand, or if you want to temporarily reduce power in very technical terrain.
  • A new NGK spark plug, better suited to the improved power the engine makes with this kit
  • 50 mm bolt and spring necessary to do the ‘idle screw mod’. Not always necessary to install but we supply it just in case.

This package makes an astonishing difference to the 300 TPI and offers the following gains over a stock bike:

  • Much more torque at low/mid revs, where you need it most, with a nice increase in power higher up in the rev range as well.
  • Drastically improved 0-1/2 throttle performance
  • More oil than the stock maps for improved reliability.  The stock 20/21 maps give significantly less oil than the previous year models.
  • 2 ignition maps: hard and soft. The stock map switch works like normal to select between the customized maps.
  • Much smoother, crisper power delivery at part throttle.
  • 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 TPI bikes unpleasant to ride at times.
  • Safer air/fuel ratios at high rpm and large throttle openings so the engine is safer during prolonged high speed running
  • Better throttle response and smoother power delivery
  • 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

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.  After all, the TPI engine is basically identical to the previous carb engine, except for the fuel injection system.  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 we have years of experience testing and tuning fuel injected 2 strokes prior to the release of the TPIs in 2018.

All ECU features work normally, including oil injection, fan and warning lights. There are no issues with hard starting and no need to tune via apps or software.  Just install and ride!

We provide an idle setting bolt that can be installed if you feel the need to change the idle speed or air screw setting after fitting the kit, however the vast majority of bikes will run fine without it.

This kit provides a very robust tune, and has been developed to work with the stock exhaust and any after market exhausts as well.  The head and ECU give a WAY 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.

We supply installation instructions plus recommended settings for the air screw and power-valve preload adjuster.  All our TPI packages are designed to work with premium pump fuel of 91 octane, assuming you choose an appropriate compression ratio for your elevation.

This is the ONLY complete solution currently for sale on the market that addresses all the necessary TPI issues… head, ignition and fuel. It is also the MOST COST EFFECTIVE solution by far. All other solutions are either more expensive or only tackle part of the problem. In order to address all the necessary issues using other parts you would need a programmable ECU, an aftermarket head, a new plug and an idle screw.  Buying all these separately adds up to roughly twice the cost of the TSP package!

Combustion chamber designs for the 300:

  • LOW COMPRESSION – this head was designed to suit extreme enduro riding or for riders who are more interested in smoothness over power gains.  It offers strong 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.
  • MEDIUM COMPRESSION – this head is our top seller for the 300 and suits the majority of trail riders and racers who want better bottom and mid power and a small gain up top as well. The power delivery is much stronger and more tractable than stock and suits a wide range of riding conditions. best suited to run on 91 octane fuel from sea level up to 4,500 ft.
  • HIGH COMPRESSION – this head and suits riders who want harder hitting power everywhere, especially down low.  It completely transforms the TPI into a weapon. Also best suited for normal trail riders who live at higher elevation from 4,500 ft and above. Best with 91 octane fuel.
  • VERY HIGH COMPRESSION – this head design suits very high elevation riding above 6,000 ft. When used at the appropriate elevation it will give similar results to the Medium or High Compression heads near sea level.



  • Purchase the TPI Power Kit by placing an order on this web site
  • Input your bike information
  • Select your desired combustion chamber
  • View Shopping Cart to verify order
  • Proceed to Check Out – enter your contact info, shipping info, and payment – click “Place Order”
  • Send us your stock ECU with a copy of your completed “Work Order Form” download form here
  • Shipping info is included on the “Work Order Form”
  • Include a copy of the “Work Order Form” in the box with your ECU
  • Once we receive your ECU and your completed “Work Order From” we will reflash your ECU and return it with the appropriate head, spark plug and idle screw.
  • Expected turn-around times are two days from the time we receive your ECU and “Work Order Form” to when it gets shipped back to you.

Note: In order for us to reflash your ECU, please ship us your ECU with a copy of a work order form, and be sure to include your bike’s VIN # on the work order form.  We are not able to flash your ECU without the VIN #.

38 reviews for TSP Power Kit – 2020+ KTM, Husky & Gas Gas 300 TPI

  1. Chad Frye (verified owner)

    This is an awesome upgrade, made my 300 more linear and responsive. Good job South Bay!

    (1) (0)
  2. Zach (verified owner)

    Nice components, awesome communication with south bay moto performance. Thanks again!

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  3. Tim

    Steve and Stacy were a pleasure to deal with!
    The kit delivered exactly as advertized, exactly what I was looking for. My 300 was not that fun to ride because the mid rage was too aggressive. Now the bike has a ton of bottom end, is very linear through the middle, then revs out surprisingly well. Totally recommend the kit!

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  4. Jordan Tuel (verified owner)

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  5. Matt M (verified owner)

    If you have a TPI, this kit is a MUST. Completely transformed my 2020 TE300i w/ a medium compression head. Solved all my idling issues with the screw and added so much power, smoothness and crispness from bottom to top. Steve and Stacy at SBMP are awesome and made the upgrade process very easy. If you are on this site looking at these kits, just pull out the credit card already!

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  6. MIKE H. (verified owner)

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  7. Keith T. (verified owner)

    Great products and great people to work with. Turn around time was phenomenal and no BS. Steve at South Bay Moto Performance was great to work with and helpful with any questions I had.

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  8. Zack P. (verified owner)

    Great overall products. Steve and Stacy were great, and provided excellent communication! I opted for the oil pump delete and Injector relocation kit as well. All products were top quality and the turn around time for the ECU flash was extremely fast. If you own a 300 TPI, this product is a must. Throttle response and overall power are great. My bike runs like a carb 300 now. Thanks again.

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  9. JUSTIN (verified owner)

    Great Customer Service Complete different bike with the TSP power kit

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  10. Anonymous (verified owner)

    Really Woke the bike up
    Super fun to ride now
    Definitely worth the money

    Image #1 from Anonymous
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  11. Anonymous (verified owner)

    You guys did great!

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  12. Christian Wimpfheimer (verified owner)

    Great improvement throughout power, revived bike,

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  13. Dennis (verified owner)

    Excellent service and turn around time !

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  14. Ben Hale (verified owner)

    Would highly recommend this package made a huge difference! Thanks South Bay for being onit!!!

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  15. Andriy B. (verified owner)

    I love it

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  16. Brandon H. (verified owner)

    The low comp head with the ECU remap worked perfectly. Couldn’t be happier, it transformed my 300 xcw into what I needed. Much improved low end and linear power delivery. The folks at south bay moto were very responsive and made sure everything went smooth.

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  17. Aaron (verified owner)

    Fast shipping, great communication, great products.

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  18. Anthony Romero (verified owner)

    Beyond expectations!!! 2 thumbs up !! Worth EVERY penny!!!

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  19. Brian Pratt (verified owner)

    I purchased the mid comp hd, reflash, and the injection relocation kit. The results are astounding! This is my 5th 300 and none have run as crisp as this one. Bottom is smooth, crisp and strong and its a hooligan on top! Bike will now hit crisply when asked on long boney off throttle, downhills when faced with a sudden step down! Never had that before!

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  20. Anonymous (verified owner)

    Great people to do business with.

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  21. Paul D. (verified owner)

    Great customer service, great follow up, and great customer support after the fact. Steve is a wealth of knowledge, and very kind in answering my stupid questions, without making me feeling like an idiot. I recommend them 100%. You won’t regret doing business with them, they are worth every penny.

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  22. Sam B. (verified owner)

    Bike has never run better! Completely satisfied and happy with my decision to go with TSP and South Bay. Strong bottom end response and no more “pipe bang” on deceleration.

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  23. Benjamin (verified owner)

    Products are top notch. Customer service was great. I called numerous times leading up to my purchase and the staff at southbay spent the time answering my questions and giving me advice. The communication after the purchase was just as good. Fast shipping and great packeging! The tsp power kit and the IRK for my tpi bike was a game changer!

    Image #1 from Benjamin
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  24. Jacob Mahler (verified owner)

    Bike rips! Like it before, never knew that it could be this good.

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  25. David Corbett (verified owner)

    Steve was very helpful and I’m glad he recommended the med comp head. The power is much smoother and linear and really helps get the traction to the ground better. Night and day difference!

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  26. Tony Zabala (verified owner)

    Very happy

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  27. Ken M. (verified owner)

    I have tried different heads, different tunes, different injector relocation kits but none have provided as much fun factor as the TSP Power kit for my 2023 KTM 300XCW. I went with the high comp head, injector relocation kit and tune for these two items. Rode it for the first time last week and I could tell immediately I made the right choice. The bike was snappier right off the bottom and all the way through the rpm range. It would lug but never stall and with a little twist of the throttle it would come to life. The bike finally runs as I had had hoped it would. Couldn’t be happier!!!

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  28. Carl Carbon (verified owner)

    Added this kit to my TE 300 tpi. It is now the best running bike I have been on.

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  29. John Lofgren (verified owner)

    The bike has finally come alive. Very happy with the kit.

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  30. DUSTIN SLACK (verified owner)

    Easy to install and the bike runs amazing with the new mapping

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  31. Christopher P. (verified owner)

    Completely changed the bike and the engine characteristics. The overall power delivery is impressive and is starting to tear the knobs off my AT81EX tire! Looking forward to the riding season opening back up in New England. Thank you!

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  32. Kyle W. (verified owner)

    Everything worked perfectly! From the purchase to the install & the ride. I couldn’t be happier with the product & the service at Southbay.

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  33. Ryan Murphy (verified owner)

    2023 Ktm 300 xc-w Reflash Kit. Great product and made a world of difference. My bike runs perfect now and has a ton of crisp power. The customer service was outstanding and they answered all of my questions promptly. Great job South Bay 🤙🏻.

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  34. Stephen C. (verified owner)

    Works as advertised. More smooth power everywhere!! Highly recommended.

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  35. Brent Nelson (verified owner)

    Head and tune are great. Love the way my bike is running. Even better than the products I purchased is Steve’s customer service. He has been helping me with an unrelated problem I’m having on my bike. And he absolutely could have told me no. He is a solid dude and I am now a lifelong customer.

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  36. Noah H. (verified owner)

    Completely changes the bike and wakes it up! I added the injector relocation kit as well and that was the cherry on top. The bike has so much more pull on the top end, it loads faster without over revving or losing power. I definitely recommend the hi comp head and IRK for any TPI owners. The install was simple and just took time because of the nature of install, the provided video helps a lot.

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  37. Kenyon Bitle (verified owner)

    Runs much better, way crisper and cleaner.

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  38. Kenneth P. (verified owner)

    Great customer service! And the kit made unreal amount of power.

    (0) (0)
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Below are the make(s) and model(s) that will fit this part.

YearMakeEngine CCModel
YearMakeEngine CCModel
2020KTM300XC TPI
2020KTM300XC-W TPI
2021Gas Gas300EC TPI
2021Gas Gas300EX TPI
2021KTM300XC TPI
2021KTM300XC-W TPI
2022Gas Gas300EC TPI
2022Gas Gas300EX TPI
2022KTM300XC TPI
2022KTM300XC-W TPI
2023Gas Gas300EC TPI
2023Gas Gas300EX TPI
2023KTM300XC-W TPI
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