SmartCarb For Yamaha YZ125
$649.00 – $748.00
Wake your YZ up!
The all-new 36mm SC3 model SmartCarb replaces the stock carburetor in stock bore or big bore (144cc) Yamaha YZ125 dirt bikes, offering holeshot-winning performance, corner-ripping torque, and tool-free tuning.
MagVolt® Throttle Position Sensor option recommended for bikes equipped from the factory with TPS for 3D ignition mapping (2022+). Click or swipe through the photos to view the Type 1 and Type 8 connectors. Select the type that matches the connector type attached to your stock carburetor.
Every SmartCarb ships pre-adjusted specifically for your bike setup. 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
What’s New!
The SC3 SmartCarb replaces the stock Yamaha YZ125 carburetor.
This isn’t your grandpa’s carburetor. The All-New SmartCarb SC3 brings carburetion firmly into the 21st century. It is a precision air/fuel metering instrument that provides better-than-EFI fuel atomization, precise mixture control, and automatic air density compensation in a single circuit, externally adjustable, jet-less fuel system.
SC3 Upgrades:
- Patented CloudForge™ Venturi Design | Optimized signal generation and fuel atomization
- Moisture Management | Improved throttle control in extreme humidity
- Larger Vent Scoop | Faster float bowl venting/fluid communication
- Blended Slide Cutaway | Cleaner off-idle throttle response
- O-ring Float Bowl Gasket | Improved sealing and sleeker look
- Doubled Fuel Rate | 2X fill passages for quicker float bowl fueling response
- “Tucked” Fuel Fitting | Improved fuel line routing
- Complete SC3 Design Overhaul | Better fitment with smaller form-factor
- Reduced Part Count | Cost savings passed to our customers (-$100)
- Lighter Weight | 12% reduction
SmartCarbs are proudly designed and manufactured in the USA!
Learn more about How It Works
Maxwell Craig (verified owner) –
Recently installed a smartcarb on my YZ125 and I absolutely love it. It came a little rich, which is a good safety precaution. After using the simple adjustments that you can use on the fly on the first ride, I now have my bike dialed in perfectly. I’ve always knew how much of a different jetting can make, but I was never able to find consistent combos that didn’t have a flat spot. With the smartcarb, my bike runs better and more linear than ever before.
Lorin Wall –
One of the first upgrades I did to my yz125x. No more worries about weather changes or elevation changes. It’s like owning a fi bike, but with carb simplicity. Didn’t have to do a thing to it. Told smart carb what was on the bike my location and the carb came ready to ride. Only complaint I have is they don’t make this available for more models of bikes. Such a great thing that should be more available. This is well worth the money.
Tubol Moto –
I spent Monday to Saturday every week tuning my stock carb and still getting shitty performance. I decided to get ssc2 for my 125x and I’m getting very good power delivery and doubled my mileage.. Better low end too..
Jimmie B. (verified owner) –
Ordered for my 2023 yz125- the bike now uses significantly less fuel and also has smoother power delivery all throughout the rev range. Worth it for those wondering.
David Lodermeier –
Yamaha YZ125 2022
I researched what was the best carb replacement was for two stroke motorcycles and the benefits and performance lead me to Smart carb! I reached out to them to get some recommendations on the carb as this is brand new bike, Nathan reached out to me and was able to dial me in.
I received the new carb and was excited to get this on and test it out. I rode the bike with the stock carb a few time previous to getting the Smart carb to compare. Out of the box the bike ran really crisp and power was great all around. After a few motos on the track and pushing a little harder I noticed it was had a bog at the end of a jump section, so I pulled over shut it off and Made the adjustment on the side of the track. Bam!! Leaned it out some and tested it out. It was better but not quite enough.
Never messing with something like this with no jets I wasn’t sure how many clicks I needed to go. Leaned it out a few more clicks total of 10 click leaner (they come a bit rich to be on the cautious side) and the bike really cleaned up and the response was even better. Off the bottom it was really crisp and quick, then as you transition to the mid to top the thing just keeps pulling. The power curve was strong al the way through and I noticed that there was not lean popping or fluttering when you rev over jumps like you get with typical carbs.
Hands down this carb will make your bike run stronger throughout the power band and keep you from pulling your hair out trying to figure out jetting specs. Best mod to a stock 125 you can do that bolts on and ready to rip out of the box.