Carter RBS Choke Thermostat – TH1120B
Upgrade your carburetor's manual or remote choke setup with the Carter RBS Choke Thermostat (TH1120B). Crafted in the USA, this two-piece, bi-metal thermostat fits any RBS-style carburetor using a 1.75? cap.
Product Specifications
-
Cap Diameter: 1.75?
-
Cap Depth: ~0.57?
-
Design: Two-piece housing with a removable coil that can be rotated for ideal alignment
-
Function: Manual/remote thermostat, not electric—relies on intake manifold heat.
-
Manufacturing: Made in the USA with durable bi-metal construction suitable for modern, ethanol-blended fuels
Why Choose TH1120B?
-
Flexible Installation: Two-part design allows coil alignment in any orientation.
-
Reliable Choke Operation: Controls choke opening as engine warms—essential for consistent cold starts.
-
Durable Construction: Built to OEM tolerance and resistant to modern fuel blends.
-
Broad Compatibility: Fits nearly all RBS-form carburetors using the 1.75? cap.
Frequently Asked Questions
1. Which carburetors are compatible with the TH1120B?
This thermostat fits RBS-style carburetors that use a 1.75? cap diameter.
2. How should the housing be oriented during installation?
The TH1120B features a removable coil that can be rotated in either direction, making it easy to install regardless of choke housing orientation
3. Is this a new production part or used?
It’s a brand-new, current-production component, manufactured in the USA to ensure consistency and quality
4. What are the physical dimensions?
Cap Diameter: 1.75?
Cap Depth: 0.57?
5. What’s the difference between TH1120B and TH1120?
The TH1120B includes the housing with the removable coil and splits into two pieces for easy orientation. The TH1120 typically refers to the complete thermostat assembly with fixed coil.
6. Is the TH1120B available now?
Yes, it’s in stock and ships same-day for orders placed before 12:00 PM PST on weekdays. Availability is listed under the product price.
7. How much is shipping?
Shipping is based on your chosen method and location. For a full breakdown, visit our Shipping Information Page.
8. How does this thermostat compare to OEM parts?
The TH1120B is a USA-made replacement designed to exceed original specs, offering improved durability and compatibility with ethanol fuels—unlike many imported versions.
9. Does the chassis allow for ethanol-blended gasoline use?
Yes, the thermostat housing and materials are ethanol-resistant, making it safe for use with modern fuel blends, including E10 and E15.
10. Is there an electric choke conversion kit for this one? Note: the choke housing must be installed. Not meant to convert a manual to electric choke.
Yes, this is the electric version.
