Hot Bulb Vierzon 401
Series: Other models
Not the right version? The data comes from vehicle registers holding many near-identical versions side by side. Photograph the data plate — we read make and type from it. Open the scanner e-mail address required
The Hot Bulb Vierzon 401 is a tractor. The name Hot Bulb refers to the hot-bulb engine: fuel ignites on a heated ignition head, so neither a spark plug nor high compression is needed, and the engine runs on heavy fuel. The engine has 1 cylinder, which shapes smoothness and low-speed torque. The engine is water-cooled, which keeps operating temperatures even under sustained load. The model uses rear-wheel drive. The model was built in France.
Tractors of this kind date from a time when engine power replaced draught animals, steam engines and hand labour on farms. They are simply built, with few gears and low road speeds, and were used mainly for ploughing, haulage and belt-driven work. For collectors and restorers the data plate, engine number and correct assignment to a variant are decisive, because versions of one type often differ only in details. Today such machines are found mostly in collections, museums and at rallies.
Technical data
Engine
| Cylinders | 1correct |
|---|---|
| Cooling | water-cooledcorrect |
Drivetrain and chassis
| Drive | rear-wheel driveWDcorrect |
|---|
Origin and approval
| Plant | Francecorrect |
|---|
Frequently asked questions
What engine does the Hot Bulb Vierzon 401 have?
1 cylinders.
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
- Compare the data plate and chassis number with the papers.
- Load the hydraulics and watch for sag.
- Ask about parts availability for this build year — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
We do not sell machines. We ask the dealers who carry this model and come back with price and lead time.
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This page carries 5 individual figures for this model. They come from 1 recorded source; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
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Sources: Tractor & Construction Plant Wiki (CC BY-SA 3.0) (retrieved August 2026) · Values adopted and presented in our own form; changes from the source are possible. · How we check the data
Tractor in 3D section
Turn the model, look inside and click an assembly — each one is explained.
