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We’re using the TXS-241 as an example here, but other TSX numbers will follow the same ideas.
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The TSX-241 was used primarily on Ford 8N tractors (late models) and some early Ferguson TO-20/30 variants. Marvel-Schebler built several sub-versions, and not all had a removable idle jet.
- Some early TSX models (like TSX-33, TSX-67, TSX-241A) used a threaded, removable idle jet located behind the main jet.
- Later TSX models (TSX-241B, C, D, etc.) often deleted the separate idle jet, integrating it into the idle passage drilled directly into the casting.
If your idle jet hole seems too large for any standard jet, you may be looking at:
- An orifice that was factory-drilled (no jet ever installed), or
- A stripped or oversized casting where the jet once threaded in.
🔹 2. How to Check if Yours Uses a Jet
- Look inside the idle well (near the main jet boss).
- If you see distinct threads (fine, short threads), it used a threaded jet.
- If you see no threads and a clean bore, that was a drilled orifice (no jet used).
- Check your carb tag number (e.g., TSX-241, 241A, 241B, 241C).
- The suffix letter is crucial; Marvel-Schebler made small internal changes between these.
- Example:
- TSX-241A → removable idle jet
- TSX-241B/C/D → fixed idle passage (no separate jet)
🔹 3. Common Confusion Point
The idle jet is often mistaken for the economizer (main discharge) jet, since both sit near each other in the bowl. The economizer jet always threads in; the idle feed may or may not.