Description
This carburetor mount O-ring fits the Honda Acty Truck HA3, HA4 (1990-1999). It seals the carburetor to the intake so no unmetered air leaks in. Your Acty's chassis number is required for this part - there are two versions of this gasket, so add your chassis number (for example ha4-1234567) at checkout for verification.
In Stock - ships from our California (USA) warehouse
Fast, reliable delivery - no overseas backorder wait.
Vehicle Fitment & Compatibility
Confirm your chassis code against the table below before ordering.
100% Fitment Guarantee
Not sure about fit? Add your chassis/VIN number at checkout and we confirm it before we ship. If a part does not fit your Acty, we exchange it or refund you in full.
Signs you need this carburetor mount O-ring
- A high or hunting idle from a vacuum leak
- A hardened or flattened O-ring at the carb mount
- Rough running that changes when you spray the base
Features & Function
- Seals the carburetor to the intake
- Correct O-ring for the Acty mount
- Stops an unmetered-air vacuum leak
Installation Specifications
- Difficulty: Easy.
- Estimated time: about 30 to 45 minutes.
- Required tools: A screwdriver and basic hand tools.
Oiwa Garage Tech Note
"This is the outer carburetor mount O-ring. A hunting idle that changes when you spray carb cleaner near the base is a leaking mount seal. Fit a fresh O-ring and torque the carb evenly."
Frequently Asked Questions
How do I check the carburetor mount seal?
With the engine idling, spray a little carb cleaner around the carb base; if the idle changes, unmetered air is leaking past a hard mount O-ring - replace it.
Should I torque the carburetor evenly?
Yes. Fit the fresh O-ring and torque the carb base evenly so it seals without warping the flange and creating a fresh air leak.
Fitment verified by the Kei truck specialists at Oiwa Garage · Listing updated June 2026.