W-O CARTER CARBURETOR HIGH SPEED NOZZLE FOR FORD GPA, GPW, WILLYS MB SLAT & MB
Carter carburettor high speed jet
For W-O carburettor
High speed jet for Carter W-O carburettor. This jet regulates fuel delivery at high engine speeds and is essential for correct engine performance. Suitable for restoration and maintenance of WWII jeeps fitted with Carter carburettor.
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Type High speed jet (main jet) |
Carburettor Carter W-O (539S / 636S / A1223) |
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Application Ford GPA, GPW, Willys MB & MB Slat |
Function Regulates fuel mixture at high speed |
Features
- Replacement high speed jet for Carter W-O carburettor
- Essential component of the fuel circuit
- Determines fuel delivery at higher engine speeds
- Works together with metering rod for optimal mixture
- Original specification for WWII jeeps
★ Technically correct component for restoration and maintenance of Carter W-O carburettors. The high speed jet is a critical component — an incorrectly adjusted or blocked jet leads to performance problems, overheating and incorrect fuel consumption.
Application
This high speed jet fits Carter Model W-O carburettors as fitted to Ford GPA (1942-1943), Ford GPW (1941-1945), Willys MB including Slat Grille models (1941-1945), and early civilian Willys CJ-2A and CJ-3A models. Carter part numbers: 539S (WWII production), 636S (post-war production), Willys WO-A1223, Ford GPW-9510.
Installation notes
The high speed jet is located in the carburettor bowl and works together with the metering rod. With throttle closed, the metering rod sits deep in the jet and restricts fuel delivery. When opening the throttle, the rod lifts and increases the effective flow area. Blocked jets must be cleaned carefully — do not drill out or enlarge unless specifically required for engine modifications. Always check float level (3/8") and metering rod adjustment (2.718") when replacing jets.
Compatibility
CAUTION: Carter W-O carburettors for WWII jeeps (539S) and early CJ models (636S) are very similar but have slight differences in linkage design. The jets are interchangeable. Not compatible with later Carter YS, YF or other carburettor types. Standard jet diameter is 0.070" (part number 120-151S). Only use different jet diameters after careful tuning — oversized jets cause overly rich mixture, carbon deposits and engine damage.
Historical context
The Carter Model W-O was the standard carburettor on all WWII Willys MB and Ford GPW jeeps, and remained in service on early post-war CJ models. It is a simple downdraft carburettor with mechanical accelerator pump and economizer — reliable and low-maintenance, but sensitive to modern ethanol fuels which attack the leather components.
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 |
| Willys M38 | 1950, 1951, 1952 |
| CJ series | |
| Jeep CJ-2A | 1945, 1946, 1947, 1948, 1949 |
| Jeep CJ-3A | 1949, 1950, 1951, 1952, 1953 |
| Jeep CJ-3B | 1953, 1954, 1955, 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968 |
📐 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)
