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XRB Race Series Methanol Carburetor

XRB Race Carburetors

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XRB Race Series Methanol Carburetor

ATM’s Methanol XRB Series are our most versatile "race" carburetors with a 4150-style flange and "no vacuum ports". They are the perfect blend of a precision die cast aluminum ATM™ carb body with ATM 2-circuit, 4-emulsion billet metering blocks. Fuel is managed by ATM™ all aluminum dual inlet, dual sight-window fuel bowls. They are available in 5 sizes from 650cfm to 1050cfm (4150 flange) applications.

Methanol XRBs come with a shiny tumbled polish finish and black anodized billet metering blocks and throttle bodies.

Please ensure to submit your custom build sheet for your order.  This will ensure that your carburetor is built correctly for your application. Please submit at: Custom Build Sheet Online Form.

Product Details

XRB Series


X = cause it's cool

R = Race

B = Billet

ATM Innovation’s Methanol XRB "race" carburetor is a step up from its XRSB series. While it shares many of the same features with the XRC, the XRB is intended for racers that frequently take apart their carburetors for precise tuning changes – the billet metering blocks and billet throttle bodies add another level of durability over die cast components. They also offer more race details like “slabbed” throttle shafts that promote smoother flow and less turbulence.

ATM’s XRB carbs use the ATM™ die cast aluminum carb body that has a fully contoured high-flow air horn and externally changeable idle- and high-speed air bleeds. When combined with ATM’s 2-circuit, 4-emulsion billet metering blocks with 4-corner idle adjustment, the XRSB becomes one of the most “tuneable” race carbs on the market. These billet metering blocks also have changeable idle fuel and power valve channel restrictions.

Dynamic fuel handling is important in hard-cornering racecars and ATM’s™ all aluminum dual inlet, dual sight-window fuel bowls were designed exactly for this purpose. They are fitted with 7/8”-20 inverted flare fittings for leak-resistant connections.

They are available in 5 sizes from 650-1050 CFM (4150 style).

  • ATM™ die cast aluminum main body w/changeable idle and high-speed air bleeds
  • Billet 2-circuit, 4-emulsion metering blocks add durability for frequent calibration changes
  • 4-corner idle adjustment
  • ATM™ all aluminum dual inlet/dual sight-window fuel bowls
  • Billet throttle body with slabbed throttle shafts
  • Dual bolt pattern throttle-body (4150/4500)

Part #: XRBA

Price: $786.70
Size CFM:
Have you submitted your custom build sheet for your order?:

Customer Reviews Write A Review

Sort Reviews by: Date | Rating Comments

1 5 out of 5 stars by PeeWee on October 6th 2022

Love This Carb!

XRB Race Series Methanol Carburetor

Pros: This carburetor was very close, right out of the box! I have never purchased a carburetor that had the throttle response right of the box like this one from ATM! We had some self-inflicted issues being new to methanol, so I called ATM and they were very helpful and got me sorted out within 10 minutes. Angela, Doug, Calvin and the rest of the ATM team are the best!

Cons: I didn't buy one sooner!

Product Q & A

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