VW Idle Cut-Off Solenoid 12V - 049-129-412C Brosol Carburetor

Idle Cut-Off Solenoid (12-Volt) – 049-129-412C

The 049-129-412C is a 12-volt electromagnetic plunger designed to control the idle circuit of your carburetor. When the ignition is turned on, the solenoid retracts a needle to allow fuel to flow through the idle circuit. When the ignition is switched off, the plunger immediately snaps forward, cutting off the fuel supply. This is a critical safety and performance component that prevents "dieseling" or "run-on," where the engine continues to sputter after the key is turned off.

Manufactured by Brosol, a long-standing OEM producer for Volkswagen, this solenoid features the correct metric threading for a leak-free seal. If your engine refuses to idle unless the choke is on, or if it dies the moment you let off the gas, a failed 049-129-412C is often the culprit. It is a simple "plug-and-play" replacement that restores factory-smooth idling and shut-down characteristics.

Detailed Vehicle Compatibility

VW Beetle:

• 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974

VW Super Beetle:

• 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979

VW Karmann Ghia:

• 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974

VW Thing:

• 1973, 1974

VW Transporter (Bus):

• 1967, 1968, 1969, 1970, 1971

Product Highlights & Features

• Anti-Dieseling Protection: Instantly kills fuel flow to the idle jet when the ignition is cut, preventing damaging engine run-on.

• Precision Plunger: Features a high-quality internal coil and spring that ensures rapid and reliable actuation every time the key is turned.

• Brosol OEM Quality: Built to the original Solex specifications used on millions of Volkswagens worldwide for a guaranteed fit.

• 12V Operation: Specifically wound for standard 12-volt electrical systems found on 1967 and newer air-cooled models.

Technical Specifications

• Part Number: 049-129-412C

• Brand: Brosol

• Voltage: 12-Volt

• Thread Type: Metric

Installation & Maintenance Tips

• Testing the Solenoid: With the ignition on, pull the wire off the solenoid and touch it back to the terminal. You should hear a distinct "click." If you don't hear a click, the solenoid is either stuck or the internal coil has failed.

• Do Not Over-Tighten: The solenoid only needs to be snug enough to crush the small brass sealing washer. Over-tightening can distort the carburetor body or snap the solenoid threads.

• Wiring Check: Ensure the "power-on" wire is securely attached. A loose connection here will cause the engine to stall intermittently at stoplights.

• Failing: If the engine won't idle and the solenoid doesn't click, you can unscrew the unit and cut off the plunger tip as an effort to get your vehicle home. 

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