History
The original Vélosolex entered production in Paris in April 1946 — one of the simplest, most reliable cyclemotors ever built. More than eight million sold worldwide, and the cult following is still growing. Early 45 models used a 45cc two-stroke with a diaphragm fuel pump and float-less carb, hitting about 16 mph and roughly 200 mpg.
Displacement climbed to 49cc on later models. The 3800 (1966–1988) is the reference most collectors know: more power, plastic tank replacing metal, twist-grip throttle, and late-run Motobécane tail lights and frame decals. Power reaches the front wheel through a centrifugal clutch and friction roller on models 1700 and later — about 20 mph, 200 mpg, and only ~62 lbs.
The export-only 4600 added DOT lighting, electric horn, and Magura controls for US-bound bikes. Folding Pli-Solex and small-wheel 5000 variants extended the line. Solex is not a performance platform — it is mechanical minimalism done at industrial scale.
Friction roller tension and tire condition define ride quality. A worn front tire or glazed roller turns a 200-mpg antique into a slipping, buzzing frustration. Check both before you chase carb problems.
Quick specs
| Drive | Front-wheel friction roller |
| Engine | 45–49cc two-stroke |
| Weight | ~62 lbs |
| Key model | 3800 (1966–1988) |
Buying & ownership
When shopping a used Vélosolex (Solex), run a warm compression check against a known-good bike, confirm the engine turns freely, inspect frame rust (seat tube, down tube, dropouts), verify title and VIN match, and take a test ride for clutch grab and idle stability. Budget a carb clean, fresh plug, fuel lines, and final-drive service on any “runs good” listing.
Use the full buying guide checklist before you pay, and confirm legal class in your state via US moped laws.
Related on MopedMasters
- All 25 classic mopeds — compare platforms
- Manuals & PDFs — factory literature when available
- Guides hub — jetting, porting, maintenance
- Tuning calculators — port timing, intake, pipe, oil mix
- Maintenance hub — carb, oil, storage basics
FAQ
- Is this a moped or a scooter?
- MopedMasters focuses on pedal-capable / classic moped platforms with chain or geared drive — not modern CVT scooters. See moped vs scooter.
- Where do I start if I just bought one?
- Fresh fuel, plug, air filter, chain slack, and a careful first ride. Then work through the maintenance hub before performance parts.
- Can I use the online calculators on this bike?
- Yes for 2-stroke singles — port timing, intake length, pipe layout, and premix all apply. Start at the tools hub.