KTM125SX 2023 TBI first dyno runs

After a few ups and downs we finally managed to get some full power dyno runs out of our new 2023 KTM125SX. Results were... interesting... watch to find out more!

[@themotocrossmodchannelWulfMX]

I have a 23' 125sx here in the US, Im doing a deep dive 125sx exploring the tech and mods, etc..Im getting it dyno'd this week so I will post results along with what fuel/mix, etc.. Follow my channel for the mods and I am super interested in the ECU tuning due to the non closed loop so the ECU won't be able to make changes to any porting or head work internally inside the engine or any other mods that effect the volumetric efficiency, I would say that the bike will potentially have some negative side effects that won't be able to reeled back in. Things that come to mind to mid that would normally be an area to address for more mid/top is raising the front transfers and exh port a hair. Adding a .010" base gasket to raise the port timing will excite things and for sure a pipe and reed cage should help as well...I can't find a compression gauge that fits into the head area, its tight in there and the frame is in the way., I would like to see what the static CR is at so if changes are made, there is a baseline like raising the comp and go after the squish clearance. My dyno runs are going to be bone stock, then a full FMF pipeset, then reeds and then also the PV "internal" mod with the map switch to see if that opens up the ECU mapping. More soon!

[@tmaxx51]

If you tear yours down, it would be awesome to see you degree out the cylinder as it comes from the factory! Curious to see if the changes on these new bikes are more than just electronic control.

[@SL4US]

What were the results

[@themotocrossmodchannelWulfMX]

@@SL4US bone stock 29 rwhp...I have been able to successfully source a USA cracker and have mine cracked right now, (check my videos)

[@bobyfatlol]

dude the it's like the best bike you can get the power just so good

[@SL4US]

From a post in 2001 discussing how ktm could inflate hp numbers 1) Use crankshaft HP, not rear wheel hp 2) Run it in a pressurized dyno room with extra oxygen pumped in and don't correct for standard atmospheric conditions. 3) Allow a wide range of squish band height and combustion chamber volume on the spec sheet, and make sure that the engine you dyno is at the extreme end of the range for max HP. 4) Special fuel

[@mikebrown41182]

Stunning, cool to hear about the different power placement. But if i have to voice my opinion, people are also getting more lazy and "comfy" easier to ride, the true guts of the two strokes should be with the bark and keep it at high rpm but yes there is only a handfull that can do it.

[@SL4US]

Dirtbike mags results were around 36 on their dyno. I think ktm publishes their results at the crank and not the rwhp so those numbers would make sense

[@HuntertheHoleshotKing]

When will the 250 and 300 dyno runs be posted

[@UltraSS-nj8kd]

Nice always good to see the real world results. Even though power isn't everything delivery might be more important in most cases. I'd be highly curious on what parts are the actual same myself. The average mileage range would be the question i have on the new TBI vs TPI Vs Carb. If it improves significantly over either one?

[@lifewithabe312]

They pipe is different from last years model. There’s a couple of other guys on KZbin that measured 37.24 and 38.6@10666rpm. One guy got 39.8 with a different head and a hgs exhaust system

[@learningtofly6804]

Super interesting to see! Dave how much Torque was it generating? Thank you!

[@themotocrossmodchannelWulfMX]

That is my question as well..

[@markbuckholz3184]

The torque curves are simply related to the HP curves with a bit of math, by seeing the HP curve, you could calculate the associated torque values. Just simple math. If there is 10% more hp at 8,000 rpm, there is 10% more torque.

[@stephanepillard5302]

As said before Torque and Power curve are math related: Power = Torque x Rotational speed This is it. Check correct units (IS) : So we have Torque in Nm = Power un Watt / Rotational speed in radian per second with One turn = 2 x Pi radian . So Rotational speed (rad/s) = RPM x 2pi / 60

[@suzuki06g]

Nice job!, looking forward to what your able to do with a '23 300xc (I have one 😊). At the same time I'm also restoring a '90 RM250 for vintage racing and I wonder if you could recommend what a good but safe squish band clearance would be for that old bike?

[@petermoss4824]

watch that highland cycles guy ..... there's a dongle gizmo that's supposed to change to 3 different overall maps in the ECU .... kinda like powervalve springs .... whatever ..... i'm keeping my carb, thank you !!!!

[@thebeardedyorkshireman8368]

How difficult did you find buying and importing? I only ask as I would like the KTM SX250 Factory but we do not get it in the UK so looking to buy from one of the regions that do get it and import it to the UK. I believe it’s a USA only bike? If anyone knows of another region I can buy from please let me know.

[@quintinlindsey7967]

By the looks and sound of it that electric power valve seems to have taken the fun out of riding a two stroke making the power more linear when the pipe hits, anyone know this to be true or am I just imagining? If you take the hard hit of the powerband out of the two stroke well that's like taking the wheels off the rollercoaster!

[@RUSTY-A-L]

Well done have you tested any of the GPX 2 stroke models? I understand they have a new 300cc two stroke version.

[@Joe69]

Looking at the ignition map, timing is completely gutted at 10,500 rpm.

[@kawicepticon8866]

noticed this too straight away..I'd assume its due to more regs than a mechanical need. Id love to tighten up the squish, throw some timing at her and feed her some c12 . I have a month or so until I will start digging into this puppy.

[@Joe69]

@@kawicepticon8866 I've been trying to figure out the best oil for fuel injection, mix it with some mrx02. i used to run klotz.

[@kawicepticon8866]

@@Joe69 I dont think the fuel injection will tend to lead towards a different brand more then others.. I would think KTM would have tested all types of brands of oil at a couple different ratios to make sure the fuel/oil flows as much as commanded. I use Motul 800 in all my premix rigs . Klotz has been a great product for ages I dont think you can wrong with their product.

[@Joe69]

@@kawicepticon8866 the manual for the ‘23 requires a JASO certification. Which our favorite castors do not have. Castor tends to produce a lot of residue and maybe it’s problematic for a fuel injector

[@themotocrossmodchannelWulfMX]

I’m only getting 28 rwhp on 93 oct, 40/1x stock stock stock and have had all updates done at the dealer and the pv is up to snuff. Any ideas? Not happy here and a lot of guys here in the US are having issues with the 125 not running right and down on power. I have a 1986 Honda cr125 that makes 26rwhp on the dyno..my AF is 18:1, KTM won’t help, not happy!

[@SL4US]

Did you use the right map

[@duckdiver5549]

it needs 98 octane fuel. i use VP T2 and my '24 runs very strong and crisp.

[@nojfrom.baya.]

I bought a motor that is the same thing that you see in the tank is it a mix already made?

[@jeffgongas7808]

Map 2 Green is full power 'Advanced' whereas Map 1 White is 'Standard' (less power). In the US, it is well known that there is an issue with Map 2 that many are trying to figure out and it is unrideable and dangerous for advanced riders.

[@i_dodge_trees]

What's the issue with map 2?

[@ryanlongley5052]

Thought map 2 was full power?

[@jeffgongas7808]

Correct.. There is an issue with MAP 2 that is causing it to run poorly.

[@mikeb4334]

Is the air:fuel ratio on the tbi bikes low in the high rpm? The carb model looks a lot better.

[@themotocrossmodchannelWulfMX]

mine is 18:1 and 28rwhp,,I'm pissed and documenting this now for them to answer for this!

[@filo5914]

White map how hp? Green map how hp?

[@thatfast3002]

Which carb was on the carb bikes? Should be a Keihin or it doesn't count lol

[@mikie758]

Keihin throttle body. EFI , Not carbed.

[@SL4US]

Yall do realize KTM has been claiming over 40hp for their 125 since like 2000-2001 but have never lived up to it when anyone else dynos it

[@insane_axom_op4218]

How can I order in India plz tell bro 🥺🥺💝

[@kevinfossey9267]

Good Old ktm, keep throwing money! 😂 💰10,000, and you still got to have work done, or try harder! Old school 😂

[@SL4US]

Yamaha W

[@Motoinc]

Over at 999Laser KZbin channel the got 32 hp.(35.5 old model same dyno)...also slow...maby they are just slow

[@SL4US]

I think Ktm is either posting bogus numbers or its a number taken at the crank