Feedback on New Fuel-Injected KTM Two-Strokes?

I absolutely love my TX300.  The power doesn't have the 'hit' like carb'd bikes but it's deceptively fast.  Like mentioned above it's seriously a jack of all trades too.  The power is crazy smooth and very predictable.  I find I ride it in green map the most as it's just easier to know what it's going to do vs the white map but maybe that's just me.  

I said earlier the thread that Jamie Ellis was on Gypsy Tales.  It was actually Whiskey Throttle.

https://youtu.be/dAey7hmUVQg?si=TkdZT-spolfhsyCu
 

I’m not an expert on sensors for FI however I understand a lot about software.  My opinion is that they will get FI much more dialed than carb bikes even with the sensors by using experience and testing.  A sensor feedback loop is obviously the best solution but good testing on dyno will get it very close, IMO.

Also the massive amount of compute available is creating a scenario where they “run” the motor completely in simulation to optimize fuel/air mixture at different RPM, elevation/temp/humidity situations.  It simply wasn’t possible even a couple of years ago.

I've had over 10 KTM 300's and right off the bat I will tell you that my comments are not exclusive to MX but will cross over a bit. If you are going to one track all the time I think a carb is quite good once your specs are dialed for different temps etc. But if you go sea level to colorado or to 14,000 foot elevation you can't beat a TBI 300. Going down really steep hills the older 300's would ding da ding da ding as the float is not  level. The TBI just idles perfect and when you whack the throttle it goes. I can also climb hills I never made before on it and really love the bike. Do I wish KTM had a tuner app? You bet but it looks like that is coming. I have 80 hours on mine with no problems. (If you notice the electric saw, those things are light and awesome for trail work)

I’ve got a 24 125 XC that I love. I’ve spent a lot of years messing with jetting as I often ride at both sea level and up over 4,000ft. Being able to just fire it up anywhere and have it run perfectly is worth it to me. I’m also willing to work through any gremlins should they arise. I’ve spent my fair share of time tearing apart carbs and understand that anything mechanical may at some point fail or have an issue. That’s all part of it imo

So as far as we know, you still have to mix the gas on these.

Hours can also be read from the ECU. But I believe (BELIEVE) that the hours are reset when the ECU is flashed. 

Oh that’s easy. I wanted the power of a 250 to help cover up my lack of skills and talent. I do want to get another 125 to try to get better on it, but it was frustrating to have as my only bike for myself. 
 

It’s really the same reason most of us old fat guys flock to 450s. They make us look and feel like we can ride way better than we actually really can.

Feedback on the price, the bike is as new as a used bike can get

Agree 100% about the carbed jetting on the 300, I had several and going from Mx to trail always meant a jetting change, not a huge deal but my 23 300sx is good everywhere…they did gain some weight and more complicated electronics but o/all this 300 is epic…I have older bikes I ride with carbs that I enjoyed dialing in and changing a jet is part of the experience, when I ride a modern bike, I”m there to ride, not play tuner..

I loved my 23 300xc. I plan on buying a 25 300sx this year. I had a 20 350sxf and the 23 300xc at the same time, the 300 was just better at everything. Except going to 13,000rpm.

I mentioned the rare metal burr that forms in the 1st hole that the pv shaft goes through. And the butter soft bridge on the cr. The plater said it’s still better than the Ktm pv sticking & having everything go bad.  

There are so many different things these 2 strokes monitor and adjust it is extremely complicated.

125 was more of a steep up hill battle than the 250/300

Once the aftermarket learned how to crack the stock ECU they were able to make it a lot better and eventually OEM learned from the aftermarket and started reflashing making them better but aftermarket is still best.

Once people start adding a pipe and head that throws the remapping out the window. To fix it takes dyno runs to do a custom remap and a GET custom remap is the best.

The stock plastic T hose with a thermostat in it screwed everything up and our Silicone T Hose with no thermostat is a huge piece at fixing the bikes.

1) People massively overstate the "hassles" of jetting a 2 stroke.  I live and ride at 4500ft and routinely go down to seal level and I do not need to rejet for it.  Once you get a good baseline setting it works well across a very broad range.  And this is with the Mikuni (on multiple bikes) that everyone swears is so difficult to jet.

2) Even if jetting was a massive hassle, it's frikkin hilarious that people bitch about a few $5 pieces of brass but yet somehow downplay the need to buy $1,000 ECU, TPS tool, frequent trips back to the dealer for re-maps and code clearing, aftermarket tuners and maps, troubleshooting clogged sensors and failed fuel pumps, etc etc.

3) Even if doing all that to a TBI bike makes it almost as good as a carb'd bike, they still weigh 10 pounds more, all things being equal.  And, as stated above, they just do not have the snot a carb'd bike has, regardless of what any dyno says.

to me they are a work in process and i know how to jet my bike. so i will wait a few years until all the bugs are fixed.

kTM 300xc. 

Love it.

Lots of `em in Moab.

Nobody can take you seriously when you say a carb works via suction lmao. Hopefully jaime didn't actually say that...

I'm curious how well KTM can get these bikes to run. Not liking how much weight all these electronics have added. These bikes have peaked my interest, still sticking with blucru for now.

I have a 24 KTM 250XCW and love it, pull really good, runs perfect and they have the new forks and work great.

Man, these comments are all over the place. 
 

I picked up a 2024 KTM 125SX last June, but I’ve only ridden it 3 times and have just 4 hours on it. Early impression for me is that it runs excellent. I had a fire breathing 2018 150SX, so this bike feels very slow in comparison. It’s very crisp, very responsive, and it’s really weird pushing a button to start a 2-stroke. Things could go the opposite direction at any time, I suppose. But right now, it runs flawlessly. 

I prefer carb personally but I imagine they can tune the TBI's to run really well. Saw a guy on the trail over the weekend with the TSP tuner on his 24' 300, looked pretty fancy. Rode a TPI 300 back to back with my 150 and it was kinda miserable. Throttle seemed like it had input lag or something.

I finally got out on my friends track to break in my new 2024 250 SX yesterday now that we dried out around here, the motor is great, it doesn't seem much different than my 2019 250 SX to me, I'm running the same gas and oil I've been running for over 40  years, Avgas and Maxima Super M mixed at 50:1, Its running clean and crisp without any drool out the muffler.

I put about a hour on the bike , getting the suspension broken in took a while, its probably not fully broken in yet but its a lot better than the first 30 minutes, it was stiff as a board at first.  lol   I backed off the compression clickers a little and it got much better.

My rear sag is about 4" with a 5.1 spring, The air forks are pretty good, I'm running 155lbs air pressure, My 2019 had a spring conversion before I bought it used so I never tried air forks before. 

I ran stock gearing 14-49 but I'm going to go with 14-51 like I had on my 2019, it was hard to pull 3rd gear through the faster sand berms unless I was being too hard on the clutch, the track is mostly sand and I ride a bunch of Southwick open practices so 14-51 should work out better for the sand.

A bit of a topic bump. I'm actually quite convinced of the TPI's reliability. But what about the parts supply? What if it blows up and I need a cylinder and crankcase? I've heard there are still long waiting times for key parts.

I've got 16 hours on a 2025 150sx, I'm 6'2", 200 lbs in gear. I run bars with a high bend, had the suspension sprung and valved, and threw an R304 shorty on it. I ride mx open practice exclusively and I absolutely love the bike. I hit open practices to have fun and this bike is it when it comes to a good time. Its light, handles great, is predictable, and has the speed to hit everything on the track. I haven't ridden a carbed 150 so its hard to compare in regards to power. I'm a bigger guy for this bike so I initially was looking for a little more and I think I found it with the shorty and gearing. I've definitely had the front end come up on me coming out of ruts so the power is there.  I have 0 regrets buying this bike and am so much happier on it than I was on my 2018 KX450. 

Forgot to mention, she loves to scream. The sound is such a satisfying part of riding this bike. 

In stock form, they are slow as hell and don’t run for shit!!!

Huh

My 25 250sx is fast and runs awesome, and it is stock.

They’re just on the lean side. They really need a reflash by TSP then your good.

I know this has been beat to death about these bikes…I have a 23 300sx with 140+ hrs…top end & clutch at 100hrs as preventative maintenance… reflash by JRoss at 40hrs, much better o/all mapping, better overrev. Like these bikes so much I bought a 25 300sx last fall at a great price… put 10hrs on it stock, I knew the gearing I like ..14-50,bike came stock with a 45 or 46 rear, which was strange as my 23 came with a 49 rear stock. Went with a remap from WMR…. Not cheap but results are staggering…bottom to top perfection and bike pulls into the stratosphere for overrev….map2 is toned down for woods/ gncc riding….all on 93 pump fuel. I don’t miss playing with the carb one bit on this bike,.. I have older bikes for tinkering….I would say they are a little more work to ride physically, after all it is a 50+ hp 2 stroke….but some guys want that, like me…I love 2 strokes…

Nope.. FI does have advantages, but for pure power output, a carb will always make a bit more peak horsepower because they are better at atomizing fuel than FI. This is well known in auto racing.