Kris Keefer Breaks Down Fuel Injected 2023 KTM 300 SX Two-Stroke 

I’ll have some cylinder heads available soon. The 300sx chamber shape is completely different than the 250. Im excited to try different shapes. If you guys want to test anything let me know.

We can remap those new ECUs... We are runing some test .. but in about 2 weeks we will have everything ready for all SX 2 stroke 2023 models.

The 2017 and up 250sx bikes didn't vibrate bad at all, the 12-16 did pretty bad. Keefer obviously knows his stuff but it would be nice to hear from people more in tune with riding 2-strokes on a regular basis (not just "I like it because you can ride it more like a 4-stroke"). Bike sure is intriguing to try...

Did want the 450 but I always love the 2 strokes going up. It’s something bout this 300sx that got me wanting to buy one in couple weeks

Great video!! Thanks guys🤘

More 300sx content!!! This was great 👍

Honest and great analogy of this bike. You made me want to get one and get back into it as an old man of 59 yrs! lol, thanks!

I'm a 125-150 2 stroke guy, but that 300sx would be a great bike for this aging senior rider! Great video guys!

Man did it live up to the hype! I wanna get this but XC 300. Since I came from riding a Traditional 2 Stroke it would be great having my 2 stroke skills transfer but It has leniency as I haven’t ridden in 2 years. At first I was considering yz250 but then this bike was announced it’s really something else. Props to KTM for innovating on 2ts still. Best thing that came from this generation we can choose operation options on 2 strokes now 🤘

Still love my 2017 250xc. Does everything well and everyone that rides it loves it.

Great review, Keep us posted on this bike. Ive been out of racing and riding mx for 10 years. Want a new bike again and want to start riding again. plus 55, 6'4" 210. MX/fast trails. Luv your reviews!

Sounds like my next buke as well. Been riding a 250sx for the past several years and just love it but a couple extra horses and electric start sounds like the perfect bike.

Finally some 2stroke testing from keefer!!

Coming from a 2013 250sxf. I really have to stay on the front of this bike all the time in air and on the ground to keep the front end down. Map 1 is great, feels like a more powerful 250f map 2 is crazy fast and you can feel some of that 2 stroke powerband. The frame and suspension is very stiff. I'm only 150lbs but it feels like my supercross bike. 144psi in the fork 4.2 rear spring, stock was 4.5. The shock damping is still firm but I have more comp clickers I can back out on. I do like a firm suspension though. This bike does awesome in sandy turns!

I like that an anti premix guy is testing this bike. That's real feedback. I love my heavily modded 2022 SX250. I'm buying this bike once they figure out the injection. 927 and VP until the wheels fall off.

Nice review. For us off road guys, 300 2Ts are God's gift to dirt bikes. Have not ridden the new TBI, but it sounds awesome.

This is excatly what I need in my life. Finally.

Good review guys sometimes talking about specs detracts from reviews ,talking about how it makes you feel for me is more important ,plus being an older guy your in my demographic , as for tuning i am sure Two Stroke performance ( should or will have a performance head and ecu tune hopefully)etc ( not affiliated with two stroke performance) ,subscribed👍

I got one as a Christmas present! Already riding it. I got the FMF fatty pipe.

I loved my KTM 380 EXC years ago- Power like hell, but also really good for lazy cruising:)

Can we PLEASE get these in the 450 or 250 class in the ama nationals

I have a 2023 300 tbi, it’s great in every way for me, except the random bog/cut out of power that seems to plague a handful. Did it on a jump face. A dudes new husky on a facebook group did it on a jump and he broke his shoulder. It’s like the kill switch is hit when you grab a handful of throttle. Some kind of electrical glitch, either fuel delivery or power valve, map reset…something. It’s very random and when you least expect it. Again, best bike I’ve ever had except this issue.

Welcome back. 2T all day every day.

never wanted an orange bike more. thing sounds sweet!

i just purchased my ktm 300sx on saturday!! i love it can wait to hear your recommendations on exhaust

Yes, Laret is the man!

Run race fuel , notice a huge difference you don’t get that loaded feeling right before you load , that’s on an 18 model I’m assuming this will run the same way 👍 makes it even better to ride

Would love to see a project done with one of these

My buddy just bought one of these from TJ'S in Austin Tx - Loves the bike but it has been shutting down (fuel pump) every so often - almost made him crash hard - Chad Reed just had a fuel pump incident that put him in the hospital I know it was a 450 4 stroke but seems to be same kind of issue - did you guys have any problems with this yet - just wondering

dyno numbers are very good close to 450

Honda, Kawasaki, and Suzuki should have kept making full size 2 strokes. They are loosing a large chunk of the market and it makes no sense. Younger riders are jumping ship after the minis are done. They may be going all in on electric and people just aren't going to like it. If they brought back the RM125, RM250, CR250, CR125, KX125, and KX250 even in their last model with upgraded plastics they would make a total killing. They may have made a deal with the new green deal I guess.

I have a yz250f would this bike be too much bike for me?

Is it still easy to work on like a 2 stroke should be?

Im in Australia and I put my deposit down the day after the bike was announced. Should be here late December. Would not wanna be a ktm dealer here...so hard for them to get any stock..Australia gets drip fed..dealer says my 300 will be the one and only one he will be allocated this year...bugger all 125's and bugger all 250's either although they do seem to be ok for 4 stroke supply. It was sheer good fortune that wet weather gave me an unexpected day off that day and I raced into the dealer..if I had to wait a week longer, someone else would have got it...would lkve to know how many allocated to Australia in total..20? 30? Woulld not likely be many more than that

Question guys, Im actually pretty new in the Motocross segment, Being riding for only 6 months, 50 years old kkkk 220 -6,2 . Would you say this could be a good fit bike for me ? Im currently riding a Kx450 2020, white map , riding Far from its limits, but I feel somehow comfortable in it ( Despite everyone telling me NOT to buy a 450 ) ..... 2 stroke has been always a dream for me to ride, but feels a bit difficult for me as a late starter in the segment.... *Im just looking to have some fun...... Thank you Guys, awesome Channel.

Yeah, fourfiddy's are for sure easier to ride and more importantly easier to be consistent on. I would love to ride this bike!

It’s good to know you guys were having a horribly good time on this motorcycle! Now you have to explain this to all of your four stroke riding buddies.

Any eng brake? B nice to have a map to dial up or down engine braking. Generally accomplished with exhaust

Have you guys seen any pistons exploding? I've seen several vids from customers about this? This bike is AWESOME. Imagine putting a little work in the motor. Great competitor to 450s. I want it.

I have one on the way.This will make KTM # 30 ( most came from Zack Osborne’s family Dealership in VA.) and 300 # 14 .Ive had 2 450’s But I just prefer a 300 2 stroke myself.

The big guy reminds me of Ron Lechein.

I've seen two 250sx, one in 2 different dealers. They said the 125's and 300's are all already sold.

the soul of motorcross is 2 stroke.

heck yeah. only comment i have is dang your front looks soft for moto!

ah, Keefer?... you said maybe run race fuel to limit running rich. but no... race fuel and avgas have a higher octane, which means a lower flash point, which in turn acts like the bike is richer. if you want to lean the thing out or help it not load up, run a slightly lower octane fuel (or switch brands). the bigger the two-stroke bore, the more the OEM normally reduces the compression ratio. lower compression prefers a lower octane. it cant burn all the fuel per stroke if the octane is too high, so the engine will be slower. this was true when Arctic Cat made their first 1000 cc twin two -stroke in a snowmobile (2007). It was a dog on premium, but ran perfect on 87 octane. the book for this new 300 suggests 93 octane, but keep in mind our fuels are different than overseas. its common to see 97 and even 98 octane when traveling abroad. so to them 93 is not the highest grade fuel. but in saying all that, each gas station in every part of the country, has various ages of fuel... so the octane readings are all over the place. plus different refineries put out different quality of fuels, so be careful. get your gas from a station that has a high turn over of fuel. running a hotter spark plug may also help prevent a bike you can't jet from loading up.

You just described my old RMX250

Does It freewheel like a normal 2 stroke?

If Yamaha was smart, they would sell a conversion fuel injection kit for their bikes. They would make a killing. Keep manufacturing the bike the way it is since the motor is the best ever made. Update suspension, frame, brakes, and plastics as things change.

What is the break in procedure?

And it was c12 in the bike 🤘

Well well well what if they were allowed in the pro level racing supecross… nvm FIM / AMA wanted them dead. They are coming back, now allow them and a higher dicplacement to race in the 450 class. It would raise the level and give the sport a second breath if you will. The sport has been very one dimensional with the four strokes since 06. Make it happen!

If the green map opens the power valve all the way then why would it have more power down below? Would be better if they got someone who understood two strokes a little more to this review. There are a couple other inconsistencies in this video as well.

I would mix it 40:1 to lean it out a touch

To people who say it's like riding a perfectly jetted carb bike, I'd say move the needle a half a clip ans go 1 size down on the pilot jet and the air screw will do the rest 😆

People who aren’t familiar with two strokes are the ones saying this bike feels like a four stroke. That’s a stupid statement. These bikes feel just like the 17-19 KTM two strokes with a well jetted keihin carb. The bikes run awesome, but they aren’t even close to four strokes on feel.

pipe and silencer? just wait for Vortex ecu

Braaap!

I agree 👊.. Sounds total Factory ✊ Sweet bike.. Thanx Fellas.. 😉

Forks looked a bit soft and hanging down in the stroke.

Sounds like it needs a carb...the way nature intended. Imagine how fun it would be if it ran properly.

Looks really good !

Why should elevation matter with how a tbi runs?!

So they are now taking the fun out of two strokes. It figures.

I bet some race gas would make a huge difference. Those things are going to be hard to get. The ole supply/demand rule will be in full effect.

I bet this will be their best selling two stroke (out side of the minicyles 50cc-85cc).

This man need a light 500af

Will Brownie race one at the 2T nationals ? He won't be riding it lazy 😬

what bikes are direct injected?

What are you talking about “direct injection” ? There are no direct injection two stroke dirt bikes in production from any manufacturer. Direct injection is used on some snowmobiles and two stroke outboard boat engines. Not sure if you know what direct injection is.

It's fuel injected- it automatically adjusts to the elevation...

This Bike is what every 2 stroke fan has been waiting for. 300 grunt with Fuel Injection!!

Man I'd love to have one

23

Is there enough room to make it a 360 ?

direct injection??? tpi is tranfer port injection not direct injection.

KTM should provide an adjustable gear shift lever and an adjustable rear brake lever. It's not "Ready to Race" when you have difficulty operating the hand and foot controls. Kris Keifer, to make it run better.... with a few more hours on it? did you try changing the spark plug? did you try changing the fuel/oil ratio?

If its feeling blubbery Try 50:1 it will lean out the fuel as slightly more oil and increase lubrication Slightly.

Sounds like it's lost all the characteristics i love about a 2 stroke

God I want this bike so bad

I’m just hear to say, they should make a jap 300 four-stroke!

Ktm 300sx or husqvarna fc350?

I see the pistons are exploding in these new Ktm 300’s.

I totally agree!! 4 strokes are just better!!

Uiiiiii❤

Why are two people who don’t like or ride 2 strokes reviewing a 2 stroke? Any 2 stroke that feels, rides and reacts like a 4 stroke loses my interest instantly.

This bike needs a softer seat.

Can't believe KTM charge a fortune for a bike with a frame from the 90s

Fast but brokeback.

Not a 2 stroke guy... means you tuck it under.

😂😂😂 rutted track.... looks like tarmac (live in Europe)

Tldw if youre fat/old get a 250 four stroke.

Four stroke doesn't have a soul ..

From a racing perspective, would it be a crime against humanity if “they” compared 300 4T with 300 2T? Or else it’s rubbish

the plastics on that thing are horrible. more shroud. less...whatever that side plate thing is doing.

Competition is not about beeing lazy and than you got all your answers today sport is about money tehnical material in this case the bike and less human qualities hard work talent and so on the 4 stroke gave the oportunity to all lazy fat ass to rine even in some competition people that have nothing to do with sport and potential brake theyr neck on a 250 two stroke. From my point of view this bike suppose to be tested by top factory pilots not by people who still ride just for fun no offence.

This is such a bad and sloppy review….

Too bad so many of them are blowing up.

Is this one of the ones that cripples the bike so they can sell features back to you piecemill? If so it needs to be boycotted so freaking hard. I hope no one ever buys this crap.

A 450 is to much bike for 99%ppl the 300 or 350 is perfect no need to go bigger unless you’re racing it’s not a big dick challenge you’ll fine you ride a 300 or 350 much better than a 450 any day

I want one to smell the two stroke.