CARTER CARBURETOR SMALL LOW SPEED / IDLE JET FOR FORD GPA, GPW, WILLYS MB SLAT & MB
WO116165 - GPW9543
Carter carburettor small low speed/idle jet
For Carter WO carburettor
Small low speed/idle jet for the Carter WO carburettor. This precision component regulates fuel delivery during idling and low speeds up to approximately 30 km/h. The jet has calibrated orifices that precisely meter the fuel quantity for an optimal mixture.
|
Function Low speed/idle jet |
Carburettor type Carter WO (model 539S) |
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Vehicle Ford GPA, GPW, Willys MB Slat & MB |
Item Individual jet |
Features
- Precision calibrated orifices for correct fuel mixture
- Regulates fuel delivery during idling and low speeds
- Small version (small low speed jet)
- Replacement part for Carter WO carburettor
- Essential for smooth idling and correct engine performance
★ When overhauling a Carter carburettor, it is important that the jets are clean, undamaged and correctly calibrated. Worn or incorrectly adjusted jets can lead to a mixture that is too lean or too rich, manifesting in irregular idling or poor engine performance.
Application
For Carter WO carburettor model 539S as used on Ford GPA amphibious jeep, Ford GPW, Willys MB (including early Slat grill version) and Willys MB. This carburettor was fitted to the L-134 'Go Devil' engine during WWII (1941-1945).
Installation notes
The jet must always be secure and must not be damaged. Use a suitable narrow screwdriver that fits completely into the slot to prevent damage. Check that the air bleed holes are clean — blocked holes due to carbon deposits disrupt the air-fuel mixture. Clean jets only with compressed air, never with wire or drills which can enlarge the calibrated orifice.
Compatibility
Specific to Carter WO carburettor. Note: modern rebuild kits sometimes contain incorrectly calibrated jets that are too small and cause idling problems. In case of problems, it may be necessary to reuse the original jet after thorough cleaning.
Historical context
The Carter WO carburettor (model 539S) was the standard carburettor on all WWII Willys MB and Ford GPW jeeps from 1941-1945. The low speed circuit with idle well jet and low speed jet provides fuel delivery from idle to approximately 30 km/h, after which the high speed circuit takes over.
This description was generated automatically. Unsure about fitment? Contact us at info@willys.be.
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This part is intended for the restoration of historic military vehicles. Fitting, aligning, deburring or reworking is part of that work and is inherent to the nature of these goods. Dimensional variation also exists between original vehicles.
Installation requires technical knowledge of the vehicle. Unsure whether this part suits your version? Ask us before purchase at info@willys.be.
ALL_CATEGORIES : Carter - CJ2A, Carter - CJ3A, Carter M38, Carter - CJ3B
This part fits:
| Model | Years |
|---|---|
| Military jeeps | |
| Willys MB (early) | 1941, 1942 |
| Willys MB | 1942, 1943, 1944, 1945 |
| Ford GPW (early) | 1942 |
| Ford GPW | 1942, 1943, 1944, 1945 |
| CJ series | |
| Jeep CJ-2A | 1945, 1946, 1947, 1948, 1949 |
| Jeep CJ-3A | 1949, 1950, 1951, 1952, 1953 |
📐 Diagrams & technical drawings
From the original Technical Manual CJ2A_PL_1949 — Parts List — only for Willys CJ-2A / CJ-3A (1949)
From the original Technical Manual TM 10-1513 — Maintenance Manual — only for Willys MB / Ford GPW (1942)
