SmartCarb For KTM 300
$674.10 – $764.10
Ready to Race? Get equipped!
This SC2 model SmartCarb replaces the stock Keihin PWK or Mikuni TMX in 300cc KTM dirt bikes, offering superior 21st century carburetor performance, efficiency, and ease of use.
Choose the 36mm size if you spend more time at low revs riding trail, woods, singletrack, enduro, or tight/technical conditions where the bottom end or low speed is a priority. Choose the 38mm size if you spend most of your time in the upper throttle range, riding motocross, GNCC, supermoto, desert, or if you are snowbiking.
Every SmartCarb ships pre-adjusted specifically for the bike for which it is ordered. Please provide information in the forms below about any engine/exhaust modifications, how you ride (riding style), and what fuel selection and oil premix ratio you use.
Questions about compatibility, sizing, or fitment? Contact Us!
Products shipping internationally may be subject to import duties/taxes.
Description
This SC2 SmartCarb replaces the stock KTM 300 carburetor. It is a precision metering instrument that provides extremely fine fuel atomization, precise mixture control, and air density compensation in a single circuit, jet-less fuel system.
- CNC billet aluminum construction
- Patented single fuel circuit design
- Extremely fine fuel atomization
- Optimal air/fuel ratio control
- Designed & manufactured in the USA
Learn more about How It Works
Justin Pribanic –
Awesome experience ordering, installing, and first rip on our 55 mile enduro ride with the SC2 36mm. Just plug and play hard! ’08 300 XC.
Nick Stoldt (verified owner) –
Just got the SC2 slapped into the ole 06 KTM 300. Should be able to ride about 140 miles on the desert tank 😂
Shout out to the guys at SmartCarb for a fast delivery and PERFECT tuning out of the box. No adjustment needed whatsoever. My compliments to the chef 🤌
Bill Ebert –
I have a 2017 KTM 300 XC. Love this bike but I put on a 36mm SC2 because I never had the jetting perfect and worse some days. The SC2 has my great bike running just awesome, and works from hot, dry Tucson air to Taylor park in the Colorado mountains!
Pawel –
I got this carb, as had enough Mikuni tmx. Well spend money. My 300 never was working good as it is.
Settings was nearly on point, idle was most i had to work on it.
Power delivery its perfect, and bike can go and go. Starts faster then tpi (we did tests 🙂 )
Will get now second for my kid bike.
Greg Norvell –
This is my second SmartCarb. I had a Cast 38mm for about 4 years and switched to a SC2 36mm for the last 1 1/2 years. The SC2 is simply incredible. Once I dialed in the metering rod height (using the methods in the unofficial SmartCarb tuning guide), I haven’t touched it. It has been so long, I can’t remember how many clicks lean I am at… I live in Montrose, CO at 6K ft elevation. We regularly ride from 3.5K to 12.5K and I never make adjustments. This is the reason why I bought the SmartCarb. Regardless of the elevation/temperature, the bike runs great. When my buddies are fiddling with their carbs, I am off riding. The only thing I ever have to do is turn the idle screw in/out a 1/2 turn when I go to Kansas City and then return to Colorado. I put the SC2 on my 300, waited 5 hours for the metering rod to lap and then tuned it per the unofficial SmartCarb tuning guide and haven’t looked back. The SC2 is worth every penny in my opinion. Customer service is also top notch.
2017 300 XCW – 630+ hours
RKTec Head
Stock type pipe
FMF Turbine Core II
Randy L –
OK here is the story on the SmartCarb you guys sent me. It worked as advertised. It ran great and idled great from the first touch of the button. I never changed anything from the way it was sent to me. It ran cleaner on the bottom than my Lectron. It will hit hard in the mid and on top when you want it. It lugs down low when crawling through rocks and I was also impressed with how it will pull a taller gear as an experiment when just chugging up inclines.
I’m happy!
John G –
I’ve been meaning to post this report since last August when a group of us from Georgia (Elevation 1,500-3500 ft.), seven on 2Ts and two on 4Ts visited Crested Butte (Elevation 8,500-13,000 ft.) for 5 days of riding. The three 19 300 TPIs were hard to start every day, had frequent altitude compensating symptoms and ran weak in general. A Lectron equipped bike ran ok but was also weak, blubbery, and drooling. The two Mikuni carbed bikes needed a step leaner needle and pilot and ran ok as expected. The two SmartCarb equipped bikes started and idled without choke, ran clean, strong, and smooth all the way up to 13,500 ft. The last 500 ft. was a long hill climb, on the pipe all the way, and I still had a perfect idle at the top. Neither SmartCarb bike had a dial touched all week. My bike was notably stronger since I have an RK Tek head, so when we swapped bikes, the comments were “that’s the strongest 300 I’ve ridden.”
Along with the other great features like the no leak float bowl, reliability, simplicity, and outstanding customer service, the SmartCarb is a no-brainer. It has exceeded my expectations both in Colorado and for the 100 hrs. I’ve ridden with it these past 9 months.
omarmech83 –
Speak about SmartCarb is very easy as use the carb, performances really increase power, increase fuel economy…..forget jets, forget screwdriver to set air screw, just two fingers and make the setting, never found a carb like this on the market and then you have a Billet carb with an amazing look, just one word: PERFECT!!!!!
And SmartCarb has a fantastic aftermarket costumer care……a carb to try….
Geoffrey B –
I reached out to Corey and Nathan after discovering their technology on a forum for the 17-18 KTM Mikuni Carb issues. Being a competitor, I could no longer afford to question how the bike was going to respond to a new venue, higher or lower elevations, or changes in ambient temperature.
I was able to fit the 38mm Cast SmartCarb directly to the bike with only minimal modification which they supplied and it was pretty well tuned right out of the box, only a few small tweaks to idle and the metering rod before we were off to the races. The bike was a totally different animal!
The SmartCarb blew me away at how well it performed. No more guess work, no more hesitation, no more second guessing how the bike will respond to the inputs I provide.
Thank you Corey, Nathan, and team for designing such a high quality product that is leagues above the rest. I cannot say enough good things about the design and am excited to continue racing with the product!
CanuckXCW –
Installed 36mm billet SmartCarb on my 2009 KTM 300 XCW. Construction appears to be high quality. Install was snug but no modifications were required to the airbox. Did not need a new throttle cable. Stock cable is fine. Bike starts and idles very well. Carb was dialed in at the factory for a 300. My bike has a 250 top end on it now. Runs very well. Feels like increased over rev even with an older restrictive Gnarly pipe. I think it is running a bit rich, possibly because it was dialed in for a 300, not a 250. I decided to not touch the clicker when I got it. It is running well and I still haven’t bothered to adjust the clicker. Hope this billet will fit the 2017 KTMs or 2017 Huskies but we will have to see about that.
wfopete –
Personally I believe a lot of riders do not know what a properly jetted bike runs like and surely don’t want to spend hours “getting to that point.” Nor can they identify a jetting problem from an ignition, fuel, PV or some other problem with the bike. I would put up with jetting that is a little off rather than “constantly fussing with it.” Yes, I change it seasonally but after that I just put up with it and ride. I bought a SmartCarb because I wanted good jetting and consistency. With the SC I can set it, forget it, and just ride; it doesn’t matter if it’s 40 degrees or 85 degrees out or if I’m at sea level or 8000′. Here’s another plus of these SmartCarbs, they are useful as a diagnostic tool, so if your bike isn’t running correctly you can pretty much eliminate “jetting” as the culprit.
Pete Petrick
SmartCarb Fan
scot.macdonald –
As an “early adopter” of the 36mm billet Smart Carb, I have enough time and experience to confidently say this is a game changer if you ride a 2 stroke. I have over three years of riding over two different bikes and have been continually impressed with the performance. The smooth electric power band from the torquey bottom to the stout over rev makes my 2012 KTM 300XC much more enjoyable and less tiring to ride. Also, the “set it and forget it” jetting aspect is not an exaggeration. As an example, in February of 2014, I was riding in the northeast in 20 degree weather and snowing at sea level. I then took my bike to Arizona and rode for a week in the mountains in 85 degree temps and 5000-6000 feet without ever touching an adjustment. The bike ran great under both conditions. Try that with a Keihin!
Lastly, I would like to mention how great Corey and the SmartCarb staff have been to work with. Corey has graciously suffered through my questions while tuning and has been available to provide advice on weekends and evenings.
Get one, you won’t be disappointed.
KEVIN.E.BROWN –
Looking back, I can’t believe that I’ve been running a SmartCarb for 3.5 years & over 250 hours on my 300 XC-W. All on the same top end. There is no way I’ll be going back to the OEM carb and I really don’t see any benefit in a FI or DI system due to the added complexity they would bring, given how trouble free the SC has been.
I usually ride in a few local enduros/hare scrambles a year. One is the Sandlapper Enduro just outside of Columbia, SC. I’ve won my class at that race three years in a row and two of those races were part of the National Enduro Series.
Thanks again for the “electric motor” feel of the SmartCarb!
jared.busenitz –
I recently took a single track trip to CO with the plan of riding some of the “good stuff” What a blast! It was an incredible trip. I built a ton of tracks for my GPS of stuff I wanted to ride, and barely got to 1/4 of it… partly due to only 3 1/2 days of riding… partly b/c some of the stuff was so fun I had to ride it multiple times.
This was my first time in the high country with this bike:
2013 KTM 300XC
38MM billet Rev. H SC w/ flange cut off stock air boot
Gnarly pipe
FMF Turbine Core SA Hardparts silencer
Red PV spring w/ Kreft adjuster, dialed to how I like it.
13-50 gearing (stock)
At 1000′ in KC, I normally run the stock head that has been recut for better performance on pump gas. For the high elevation trip, I purchased a 300SXS head and had it milled for 8000′-12000′ on pump gas. I took the stock carb w/ a new air boot, kitted w/ appropriate jetting just in case. I didn’t want my trip ruined due to some niggling issue.
All that to say… I didn’t touch any of the extra parts. The bike & carb setup was unreal! Crazy good, especially considering I was riding well above the tree line in many cases.
With stock gearing, 1st gear was great for the gnarly. 2nd and 3rd were dialed for moderate to fast paced flowing ST. 4,5,6 were only used for transfers. It had a stupid amount of low end grunt for the gnarly stuff, & I rode lots of that. Some of the terrain would have been difficult to hike through, let alone get a dirtbike through. It was amazing how it lugged & refused to stall… absolutely no need for an auto-clutch. It chugged & churned, but would respond with authority when asked.
I wish I had a more scientific fuel mileage estimate, but I do not run a gauge cluster, and just used my GPS for mileage for the day… sometimes forgetting to reset the mileage. Doh! I never ran through a stock tank full in one day, but easily had 60 miles on a not-quite-full tank to start, with plenty more to go… never hitting reserve. I’m guessing I could have rode 90-100 miles of reasonable riding. That’s just a guess though. Fuel mileage was much better than my buddies 200xc-w with a 3.3 gallon tank.
I had a submarine moment where I drown my bike & had to dewater it. I was trying to hurry through a section to meet up with some buddies on the other side of a pass. I came up to a water crossing that I had been through in previous years. It was larger & wider, but did not think much of it, trying to make time. I wheelied in, landed, and water poured over the seat, into my pants, etc. I got one more blip of power, then blaaaaaaahhhhh.
I had to push the bike out of the crossing. I thought… oh no… with this carb, how is this gonna work?
I rested the rear wheel against a stump and tipped the bike up to empty out any water from the exhaust. I then pulled the plug and ran the starter. The exhaust and motor was full of water. The air filter was water logged. I was 15 miles from anything, way in the sticks. I went through my routine as best I could. I cleared the air filter, slapped a new plug in it, after getting as much water out from the plug hole & exhaust as possible.
It started instantly and I went on my way. I put a new air filter on when back at camp and never experienced another issue.
Now, after about 30 hours on this carb, I am a raving fan! Everyone who rides the bike is too. They are mazed by the crispness and rideability of the bike, epecially when they compare it back to back with theirs. In fact, I went riding today with a friend who now has to have one too! 🙂
Thanks for a great product & great customer service Corey! I am watching in anticipation for your future products. You continue to elevate the game in a way that provides accessible drastic improvement for an average Joe.