2024 KTM 300SX Fuel-Injected 2-Stroke Test

#motocross #racing #sports #motorcycle
The 2024 KTM 300SX two-stroke was an all-new bike last year, with a ground breaking throttle body fuel-injection system, electric start, electronic power valve, dual map options, all-new chassis, WP XACT air forks, and more. For a motocross-specific two-stroke, this bike has an ultra-smooth power character that makes it easy to lug in the corners, and has tons of power in the mid and high rpm range, pulling up to 55 horsepower. In this video, MXA test rider Connor Styers shakes down the bike and Josh Mosiman shares all the details we know about this bike after spending a year on the 2023 version.
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[@bobkinney7913]

IMO , if the AMA was serious about growing the sport they would allow 150 2t in 250 class, and 300 2t in the 450 class.

[@mikebrown41182]

There is for sure several reason they wont, on reason is ecause the Honda - Kawasaki - Suzuki - japanese manufactures came to an agreement over 20 years ago not producing any more two strokes. So if they allow one single manufacture to enter he class with one bike under three different brads KTM - Husky - GasGas, the japanese would not be particular happy.

[@bobkinney7913]

@@mikebrown41182 Well, I guess we will just have to keep em alive in the woods! Appreciate the feedback!

[@chaddeans4549]

Yes, they need to bring back the 2 stokes back into racing. Let the best bike win

[@bobkinney7913]

@@chaddeans4549 100%!

[@SpeedStacking3000]

250 2strokes are allowed to race with the 250 4 strokes since years here in Switzerland, we got about 3 guys in the top 10 over here racing Husqy 250 2strokes

[@mikebrown41182]

Josh is solid. Well spoken, goes fast, always fun to watch and listen to. And i guess one have to thank KTM for still evolving two strokes.

[@KillinReapers]

He definitely has an awesome family. He was a Honda guy, but Ktm is better right now with this trail king.

[@mikebrown41182]

@@KillinReapers He does, and he got swedish roots wich is cool!

[@KillinReapers]

@@mikebrown41182 Yeah Hellen Moseman is awesome, straight up from Sweden. She would always go out of her way to ask if someone needs help, even after not seeing them for years. Super happy for Josh now after those years with him in school/baseball. Genuinely a good dude. Watchout for Micheal though haha ;).

[@mikebrown41182]

@@KillinReapers Helen, typical swedish name 😄. Haha i like Josh, i Dont know much about Michael, but Josh hangs out with another swede fast freddie, i’ve met him when i worked with Josh Hansen and the guys overseas for a supecross event in Sweden, great guys!

[@Davido50]

That's why he's the future or MXA. -Ohio

[@vintagetrikesandquads4012]

I love the power delivery, sound, and smell of 2-strokes--especially with Klotz premix. I'm glad KTM is keeping up 2-stroke development. I'll give the 300sx a serious look.

[@Cr125stin]

I love the smell of Klotz as well. I’ve ran Klotz R50 for years

[@Davido50]

I use Maxima 927 myself. *Top ends last super long esp when ya keep fuel fresh /not run too lean a mix etc*

[@YZFMX256]

I will say i love my 300sx, definitely the best bike I’ve owned hands down.

[@kevinsnow9157]

You do an excellent job on these bike break downs josh !! Thanks for another banger!!!

[@bryceridesbikes]

I think they should bump up the displacement rules so 150s and 300s should be allowed to race with their 4 stroke counterparts.

[@daneg]

word. the displacement rules initially established were always a crock, and the improvements to 4-strokes since then have only made them more of a sham.

[@gerardabbatte331]

Just about any local motocross track has many two strokes racing four strokes every weekend.

[@bryceridesbikes]

@@gerardabbatte331 we might see more 2 strokes in the pro ranks if they could add an extra 25cc or 50cc to keep the horsepower deficit in check. The ktm 300cc making 55hp is right in line with 450s, seems like they should be allowed to race together at ama level racing.

[@gerardabbatte331]

@@bryceridesbikes I agree but do not make the AMA rules. As a local Vet racer they do not affect me. Racing is 90 percent rider and ten percent bike. They are all competitive. A skilled 125 rider can and will smoke the average 450 rider.

[@justincoats7236]

Everyone but the AMA thinks they should be able to race against the 450s.

[@daneg]

this machine needs to be eligible for competition in 450 pro nationals. the established displacement rules are a sham to "force" riders onto 4-strokes. Just allow it and see how it sells. eh?

[@Davido50]

True👍🏻or only play riders /dune guys will buy it. Maybe that's enough for KTM group to build it? 🤔

[@aklaunch]

Thank you Josh. I really appreciate your videos and the magazine. I don't even ride dirt bikes. My son is 4 and rides 3 days a week on his PW50. He loves pouring over the magazine. I like to watch the videos and see where the front line is.

[@spacejaime]

That O'Neal/Gaerne combo looks super sharp!

[@artsteale3443]

It would be interresting to see a compairason of the SX300 to the XC 300 since the XC has the duel cartridge forks.

[@gerardabbatte331]

I have a 1992 KTM MX300. They did make them back in the day 😊

[@vetb882]

No freaking way dude. 03 250SX 2T. BRAAAP

[@daneg]

I just realized...those traffic cone MXA helmets finally look good in that they match the color scheme of the KTMs. Josh looks pretty slick with the O'neal color scheme. 😄

[@justincoats7236]

My brother always wore an orange helmet so we could find him racing.

[@Davido50]

That's alot of 2-stroke MX bike for even a Vet guy like myself. The 250cc KTM & Yamaha are plenty powerful & ya can race in local or national events. It's sweet but I'd prob go for a new '24 KTM 250SX or '24 Yamaha YZ250. 💯

[@jonathondavis170]

It may be down 5 HP from the 450cc 4t, but it has more power/weight ratio, and much less engine parts/rotational mass/momentum - so that equals the bike being easier on your body to ride and manuever. This bike honestly felt amazing when I sat on it at the dealership - like an old boot or glove! However, I own a TM Racing 300cc 2t and Honda 450cc 4t, and enjoy the 4 stroke more! lol But boy, does it wear you out much quicker...the 300cc 2t feels like a magic carpet compared to the 450cc tractor after riding back to back! lol -And that's with a completely built/tuned engine, clutch, A kit suspension, GET ECU etc. on the Honda...and I TRIED to make it easier to ride for longer periods of time, but it just has too much rotational mass and torque inside the engine no matter what is altered...but the fun factor is there on both! 💪 Get out and RIDE! Praise you, JESUS! 🙌

[@mikebrown41182]

That is also Stock. If you mod it you could with ease get into the 60 range similar to the 450´s.

[@codenamenoob4973]

​@@mikebrown41182at the rear wheel? Even 500 2 strokes tuned struggle to break the 60hp

[@mikebrown41182]

@@codenamenoob4973 Depends on dyno, the numbers on "firebreather" 250 two strokes is 53-54 now ofc heavily modified. I dont see any barriers for a solid engine tuner to get to 60 with the new implemented technology. 500 two stroke to break 60 sounds quite of, but in the end HP is not everything. Anyway here you go kzbin.info/www/bejne/fXKceZt7p7qKb5o

[@bloomerb4162]

Huh, I ride a 2022 tc 250 and I tell my friend who gas a 23 yz250f, that his bike feels like a magic carpet. Have a 017 tc 250 with 300 kit but has a lectron on it, nothing right off throttle.

[@windexglasscleaner6800]

@@codenamenoob4973all the 500s are old designs, nothing compared to some of the new ktm tech. I’d say pipe, silencer, head, and a tube could do close to 60. Port the cylinder and be over 60

[@Errwea1]

Never knew cc stood for cubic centimeters. Thanks for throwing that out there ❗️

[@tomvanheeswijk5560]

In Europe there are many problems with the new-gen 2 strokes , do they hold up good in u.s ?

[@MrPeterson294]

Hell yeah brother!!

[@vinceedwards3978]

Was that you passing Jason Anderson in Talladega???

[@shereemitch]

How about this, If your a privateer and not in the top 20 you should be able to run one of these? Make the AMA/FIM could try it out for a year or two.

[@gamermoejoe]

I love my new 250sx! Do woods so I get to do the 250 class 😭

[@stevesmith756]

Have they fixed the FI problem and the piston clearance problem?? Maybe I’ll wait another year

[@Pugman69420]

You guys should do 250 SX versus 300

[@marcusbarnes5929]

Hows does the ktm 300 sx compare to the ktm 450sxf?

[@piedawg12]

I've had 5 kids ask me about the rev limiter at the track since you posted this

[@vetb882]

Make sure you sell them kids the blue powerband, the BLUE one.😂 The red and orange powerbands are not always a perfect fit. Also, make sure their land line is working, if it's not tell them to call Verizon and have them add more dial tone fluid... Guys, you gotta keep it topped off. BRAAAP

[@mark_Hershey]

Did they give you all one that doesn’t have the random tbi “bog” issue?

[@Corteum]

What is better for a 2-strroke? Electronic-fuel-injection or Direct-injection?

[@johnrickey5631]

bike looks awesome just sitting on the bike stand.

[@daneg]

is the rev limiter necessary on this bike? I mean does the FI or mapping or something make it necessary vs. (e.g.) the YZ 250?

[@SpeedStacking3000]

Its Injectec so it is necessary, it would rev to the moon otherwise. Your YZ kind of limits itself cause it has a carb...:)

[@morley3810]

@@SpeedStacking3000 Actually RPM on a 2T is typically limited by the reeds, and speed of pulses through the transfer ports, definitely not the carb. I'd also like to know why the KTM has a rev limiter. Still has reed valves and still has basic 2 stroke operating principles.

[@faranloyannick4258]

Hello .c'est pour augmenter la fiabilité,cela évite d'user le moteur prématurement,comme sur les 4t

[@danw9946]

I love this bike. I was able to buy my 24 300sx on June 6h of this year obviously. Got it super early and haven’t been happier.

[@RobertLeMay848]

Is a 300 kit still available as an add on to the 250sx?

[@ExellentRachet]

There was no kit listed for the 250 SX in the powerparts section of the KTM website when I looked.

[@Corteum]

Is there any way to turn it into a 350?

[@lancejohnson1442]

Josh you should reach out to Dean at R&D he can remap the stock ECU too! Twisted Dev is great so is R&D!

[@vwsandvettes3253]

Wait does the '24 300sx have 55hp or 57hp? The KTM website shows it has 57hp.

[@kelevra558]

Hey man, do you guys need a 6'5 250 lb test rider? I'm a top 3 guy in my local vet pro class, sort of biased to Yamaha but I can go fast on literally anything. I've raced everything from a '95 cr250 to my 2021 yz250 with a 325cc big bore kit, to my 2003 yz450 I've dumped copious amounts of American dollars into to create the completely polished then transparent purple powdercoated frame, 20% nitro 80% c16 burning 77 horsepower monster it is today. A paddle tire is the only rear tire it sees these days because of all the one off custom machined parts my late grandfather and I made. I can't risk racing it and loosing what reminds my entire family of him. The old girl was his last big project and I gotta say he did the best work I think I've ever seen in my life. From the billet cylinder head to the billet piston with 12 tiny holes drilled in the top and special chamfered piston rings that allow oil to be what seals it up to create a virtually frictionless compression when oil pressure is introduced. It's by far and away the most violent and terrifying motorcycle I have ever ridden and I daily a 214whp R1m. It has absolutely nothing for my old yz up to about 100mph when 4th gear tops out. If someone can, let me know. I know more and more big dudes are riding these days and we have absolutely zero opinions because there's no test riders who are actually fast our size. That I've seen anyway. I have pretty damn decent whips l, as you can see from my profile picture, and people tell me I'm the nicest guy in the world. I'm not sure about that I think I'm kind of an asshole. But I enjoy being around like minded people and debating how Yamaha is and always will be the best manufacturer of on and off road motorcycles.

[@corbettcorbett2688]

Can you do a xc review on a moto track

[@Andy-co6pn]

Still on an air fork ??

[@seppomontaalasmaaman1339]

Does anyone know how does those Kymco cylinders hold up?

[@andrewpereira1117]

So far no disasters, on alot of forums

[@bdubz01]

Over 100hrs on my 23 and 40 on my 24 and absolutely flawless. But I did have an Elko cylinder grenade on myb19 tc 250

[@seppomontaalasmaaman1339]

@@bdubz01 Thanks!

[@nicholassmith2631]

What does TC do on the ktm bikes I have it on my 450 and it doesn’t do shit

[@lennartdiedrich2734]

why went ktm away from the 150 ?

[@BERZERKERSV4]

Anyone notice name “Kymco” proudly cast into the jug ?

[@chrisgleis4297]

Spoke lock nuts

[@Proter333]

Que moto 😍

[@Zt3v3]

KTM used to make a 300sx, it's not new, it's just back again.

[@jonsainsbury8726]

Air forks???

[@kochj0713]

AMA are dumb for not allowing 300cc 2st with 4504st. Not good…for the sport

[@chaddeans4549]

They scared a cheaper 2 stroke will win

[@boblogIIIfan]

They should do like a 3502t vs 4504t

[@toddcragun9656]

So they say there is no engine braking. Is that true?

[@santanikx9]

kymco cylinder? i didnt know ktm were with kymco mopeds lol

[@Lucas.stalcup]

I wish I would never have sold my old Kawasaki KX100 I miss it so bad.

[@bodie29]

If 4-strokes are so great, why not allow 250 2T to race 250 4T, and come out with a 450 2T to race with 450 4T.

[@dimz_ap]

At the same cc the 2stroke would ripout the 4stroke all day,the issue is 4stroke is more environment friendly than 2stroke,so they shut it. But truth is,they could milking more money from 4stroke than 2stroke,more complicated and more engine parts

[@eldiablo4616]

E-Bike makers scratching their heads right now lol

[@JustSharetheStoke]

Do my eyes deceive me or is that really a Kymco branded cylinder? That’s insane…

[@powersportsenthusiast1986]

i saw that as well. im hoping thats not what it appears to be.

[@romainbrb6935]

Kymco like the farming ATV’s? I saw that too on top of the cylinder

[@powersportsenthusiast1986]

@@romainbrb6935 they have their hands in a lot of things and manufacturers it seems, not just quads

[@biggussniffus5537]

Kymco make parts for many other motorcycle manufacturers. Nothing bad about the brand, they're great.

[@joshmosiman1955]

Nope, you’re right!

[@Ranger4444]

The $20 a gallon question is do you need to run ras gas on this thing or can you run 93 and not worry?

[@stevedouglas1654]

I never run pump gas in my YZ285. Ethanol free super unleaded & VP110. Just sayin 👍

[@stevesmith756]

Keep it ethonal free

[@joshmosiman1955]

We run pump fuel 91 and it’s great!

[@microsoft790]

@@stevedouglas1654nowhere in this state sells high octane fuel except race fuel places it’s such BS.

[@stevedouglas1654]

@@joshmosiman1955 I’ve been told years ago that ethanol free gas is way better for 2 stroke pistons and leaves no varnish in my Smartcarb carburetor. It’s easy for me because our local farm feed co op gas station has it and VP race gas at the pump. Great bike review tho. Getting a 2024 Husky TX300 👍

[@alexnajarianmusic]

55hp is great for only 300cc. Imagine if they made a 500cc two stroke.

[@markilleen4027]

even a 400, would be nice, i just want more gears though

[@thelawnmanky]

I thought they went to spring forks in 2024??? You sure about those air info you put on this video??video??

[@1176hambone]

Thats for XC and XC-W models

[@ls2goat406]

Is that a Kymco cylinder I see?

[@bdubz01]

Yes and after 100hrs on my 23 without a single issue I'm happy with it. My 2019 tc 250 grenaded the Elko cylinder in 30 hrs

[@BenIngold]

The broll in this video would make a great second video.

[@derkbrock5996]

U definitely can race it in the open pro sport and plus 25 class at ama events some false info there

[@n.elliott9122]

Needs oil injection and an oil reservoir. Come on, Suzuki had it on the DS line of bikes back in the '70s and '80s and it was bulletproof.

[@bryceridesbikes]

The trail bikes are doing that, less weight on the mx bikes not having the separate system.

[@powersportsenthusiast1986]

the xc-w line has that

[@stevesmith756]

It’s an MX bike. Mix it

[@MiikeyLawless]

Those were much lower performance bikes. If that pump fails, the engine is kaput.

[@chrisvozza6530]

Bad ass bike . But yea they mainly made it for the vets I feel

[@paulelm4645]

They need to make it full 300cc it's only 292

[@goa0026]

Why are you saying KTM never made a SX300 . They had 300 up until at least 1995 i think

[@vwsandvettes3253]

Soo siiiiccckkkk 🤣

[@vwsandvettes3253]

Now they need to make a 350 SX!!!

[@rwa3114]

I KNOW OF TWO 2023'S THAT THE PISTON IS COMING APART WITH LESS THAN 30 HOURS !

[@bxrnl2114]

People hate on KTM but except Yamaha no Japanese manufacturer has full size 2 stokes anymore And Yamaha has been making the same bikes for many years meanwhile KTM is fuel injecting 300 2 strokes

[@warclownband]

i was gonna ask how you guys get bikes that are rideable and maps that work, and was hoping that the 24 was better. then i seen it.... 2:13 ---- KYMCO.

[@jimollila1569]

😀😀👍👍

[@PalataoArmy]

2:14 so ktm using china parts, kymco?

[@LaurentiusTriarius]

If it's reliable that's really interesting.

[@bdubz01]

Over 100hrs on my 23 and not a single issue

[@zackk695]

In 2023 or even back in 2000 we should t even have arm pump from a clutch. I believe a clutch should be so easy to pull in it only takes a few lbs of pressure. Watch how that will happen in 5 years. They should just figure it out now and all the other faults with their bikes.

[@barnescycle]

Only a stud would own a 300 2 stroke

[@vwsandvettes3253]

Can someone PLEASE get the AMA out of our way and thereby allow common sense back into the sport? Btw I LOVE this 300sx, and I want one in addition to a 2024 YZ250. Thanks MXA!

[@federico297]

9399$ in the US vs 12600$ equivalent in Italy (11450€)...... Nice........

[@michaelj.kastner5165]

Make a 500-cc KTM

[@chriscardoza9785]

Where does it fit in motocross must be a old guys bike l guess.

[@daneg]

theoretically, you could bring a CR 500 2T to the gate drop in a local race. It's technically the 250 Open A/B/C (at least around here). but for national stuff like loretta's and AMA pro racing, it's not allowed on the track.

[@CBCycles]

How on earth can the AMA not allow this bike to compete with the 4T’s, it’s giving 50% engine away ffs!! Would love to see the AMA grow a pair and make its own rules instead of being ruled by the Japanese manufacturers

[@3000KTM]

i wish they wouldn’t smooth the power out on modern bikes … don’t people ride 2 strokes because they like that hard hit , taking it away is taking the piss

[@zackk695]

I still don’t know who screwed up this sport but it’s just common sense that if it’s a 125 it should race in that class, 250 in its class and 450 in the 500 class. Whoever came up with this idea really had a screw loose. They won’t let the 2 strokes ride in their class because they would literally smoke the 4 strokes. Well to damn bad. Whatever agreement the manufacturers made can be undone. It’s time and we’ve had enough of those 4 strokes. The 2 stroke is a true motor cross racing machine and just because they have to make the motors 50% larger on the 4 strokes just to compete is ridiculous. To damn bad if they can’t race their class against the 2 strokes. The Doug Henry winning the event on a Yamaha that was actually a 450 in the 250 class was also a stupid move. Doug Henry was riding great and would have won on 2 strokes. The 4 strokes caused the fan base to be non existent. We have to reach the kids and the sound of a 4 stroke to a kid is no different than listening to a lawnmower. If KTM was smart they would put their top riders on a 300 2 stroke KTM and race the 450 class and they would easily win

[@kentr2424]

Steve Whitelock of the AMA and whoever was running the MXGP's in the late 90's (Giovanni something or other?). They're the ones who pushed for the 4 strokes - especially the displacement limits.

[@zackk695]

@@kentr2424 That’s true and look what it did to the sport. They can be easily taken over. The sport should be 2 strokes only which are true race bikes. The limits your referring to should have been limiting the size engine used in racing and only equal cc motors race against each other but then they started allowing the 450’s to race the 250 class in the pros because the 250 2T would smoke the shit out of a 250 4T. It wasn’t fair then and still isn’t right. Now you have racers not even running bikes wide open due to 4T having power on the low end so it’s not even racing. When you watch 2 strokes race they are on the pipe and running hard. There are 2 Sonos is still making the 2 stroke out of the 4 but this is all up to Honda. Honda is the biggest name and if they were to release a new line of 2 strokes on the newer frames then there would be a year waiting list to get these bikes and they would easily win in the expert and pro class

[@manuelalejandrosanchezgome9706]

Kymco????😮

[@kick8472]

Fake News! KTM made the KTM 300 MX back in the 90s. Also a 350MX which I had. (2-stroke, not 4)

[@nicholascanjura5051]

I wish stank dog race this machine in the 450 class

[@jorgearraiol6350]

2.13.... kymco?????????

[@derkbrock5996]

Try $10,000 plus

[@jedielder7970]

Yes, let 300 2-strokes race in the 450 class! AMA, do a fan survey and let the chips lie where they fall. Be real.

[@jarredtremain4644]

2bangas rule any cc. Funny how 450cc 4strokes were allowed to race in 250cc 2stroke ama racing which ruined alot of the excitement of motocross racing, it ended up changing names of classes and 300cc aren't allowed. 450s aren't winning extreme hard enduro because most are on 150-300cc 2bangas as they're heaps quicker, lighter and reliable. Bring back the excitement. I'm on 2018 husqvarna te300 last of carby models, it's a rocket ship animal, so exciting to ride. Avagud1

[@HWG-wm8ld]

I’ll stick with my YZ. The 2k$ I’ll save will go to tires and maintenance.

[@googlesucks3520]

Cope harder

[@Blucru90]

Fucking airforks

[@timothydudley3106]

It’s real BS allowing a 4 stroke to use a 450 cc while two strokes can only use 250cc it’s not right a 4 stroke has more hp so how the hell you can call it fair?

[@neilr4867]

Kymco cylinder. Made in Taiwan.

[@andrewpereira1117]

Taiwan makes the best chips in the world

[@samuelleary4439]

SX stands for SUX

[@fabiobragagnini9781]

Juste 🤮🤩🤮

[@longzee7259]

10k for a Taiwanese 2stroke.!

[@mixerguru]

that motor has "KYMCO" stamped on it WTF.....i dont know dude doesn't sound very healthy and again is has kymco stamped on it which means that the motor is built by a Chinese scooter company who's product is awful im have several to beat on.

[@izzy69ize]

Graphics suck

[@lennartdiedrich2734]

time to allow 300 in 450 and 150 in 250 class

[@kolasillers7776]

No sound better in the world like two stroker and Audi Quatro 5 cylinder. Hate sound of four stroke .Sounds like dying rhino.

[@CrashEightyTwo]

Wow democrats must have choose the colors, that is one ugly bike.

[@tdubbs934]

Its not rainbow colors at least…

[@ExellentRachet]

What does this video about a motocross bike have anything to do with politics?

[@MX-rd3fc]

I liked the 250 much better. This is more an xc to me

[@Hawaiicountrylivin]

New bikes suck.cant buy bikes for all the kids cause to expencive

[@michaelj.kastner5165]

Get a job, if you really love your kids you would buy them a new dirt bike, don’t be a loser Dad!!!