Kacarber AT125 Carburetor Replacement for Coleman AT125-B/EX/UT 125cc Quad — Direct-Fit 4-Stroke, OEM-Style Mounting

The Kacarber AT125 carburetor is a direct-fit replacement carb designed to restore reliable fuel delivery for Coleman Powersports AT125-B, AT125-EX, and AT125-UT 125cc quads.

This aftermarket carburetor is built to match the critical dimensions and mounting pattern of many small four-stroke engines so you can swap it in quickly and get your machine running smoothly again. It’s engineered to be compatible with a range of 49cc–125cc 4-stroke ATVs, dirt bikes, and go-karts and includes the key measurements you’ll need to confirm fitment before purchase.

Will this carburetor fit my Coleman AT125 or similar 125cc quad?

Most likely yes, if your model is one of the listed Coleman Powersports AT125 variants or uses the same intake and mounting specs. Compare the engine opening and bolt spacing on your machine to the carburetor’s measurements to ensure a correct match.

• Engine opening outer diameter: 19 mm
• Bolt hole spacing (engine side): 48 mm center-to-center
• Air filter mount diameter: 35 mm
• Compatible with many 49cc–125cc 4-stroke engines

How does this replacement carburetor help performance and reliability?

Replacing a worn or clogged carburetor restores consistent fuel-air mixture delivery, improving start-up behavior and throttle response. The result is more dependable operation during normal riding and fewer stalls when accelerating.

• Fresh metering passages reduce hesitation and flooding
• OEM-style mounting ensures secure installation and sealing
• Designed for four-stroke small engines to match original flow characteristics

What should I prepare before installing the Kacarber AT125 carb?

Gather basic hand tools and a clean workspace; draining the fuel and removing the airbox simplifies access and reduces contamination risk. Inspect gaskets, mounting studs, and the intake manifold for wear and replace any damaged parts for a leak-free installation.

• Tools: screwdrivers, socket set, pliers
• Replace any brittle gaskets or cracked manifolds before reassembly
• Check fuel lines and filter for blockages or aging rubber

Can this carburetor be used on other small four-stroke bikes or go-karts?

Yes — it’s engineered as a universal replacement for many small-displacement four-stroke engines within the 49cc–125cc range, provided the physical connections match. Always verify the listed dimensions and mounting pattern against the engine you intend to fit.

• Compatible with some Honda CRF50, XL70, XL75, TRX70, CT70, CT90, CT110 Trailsport 90 models
• Also suitable for various 50–125cc ATVs, dirt bikes, and go-karts using similar intake measurements
• Not a plug-and-play fit for all makes—compare dimensions first

Who this is for: Riders, mechanics, and hobbyists who need an affordable, dimension-matching replacement carburetor to repair or refurbish a Coleman AT125-B, AT125-EX, AT125-UT 125cc quad or other small four-stroke machines. It’s intended for people comfortable verifying fitment and performing basic carburetor installation and tuning who want to return a stalled or poorly running engine to dependable operation.