MBK 51: General Information - Spare and Tuning Parts
The MBK 51 is a classic moped from French manufacturer Motobécane, which later became MBK after Yamaha took over. It launched in the late 1970s and became the company's flagship and best-selling model. Numerous versions were available, ranging from simple, practical mopeds for everyday use to sport models such as the liquid-cooled Magnum Racing.
The MBK 51 remains very popular among fans of vintage mopeds, especially in France. That is why we offer parts of all kinds for every version of this iconic 50cc moped.
MBK 51: Technical Specifications
- Two-stroke engine
- Cooling: air-cooled or liquid-cooled, depending on the model (AC / LC)
- Drivetrain: belt primary drive, chain final drive, with or without a variator
- Starting method: pedals or kickstarter
- Brakes: drum brakes
- Frame made from pressed and welded sheet metal with an integrated fuel tank
- Front suspension: telescopic fork
- Rear suspension: twin shock absorbers
MBK 51: Our catalog
Our online shop offers a wide selection of spare parts for all MBK 51 models. We stock everything for a restoration to original condition or a powerful racing moped build. The range includes cylinder kits, exhausts, carburetors, tires, wheels, suspension, headlights, tuning parts, and even screws.
Frequently Asked Questions About the MBK 51:
Are parts interchangeable between the MBK 51 Club, V, Magnum, and Magnum Racing?
Care is needed here, as not all parts are the same. Many parts differ depending on whether the moped has pedal or kickstarting, liquid or air cooling, and points or electronic ignition.
Will an aftermarket replacement cylinder, piston, or cylinder head fit my AV10 engine?
A cylinder kit for the AV10 engine will fit in any case. Most cylinders, pistons, and cylinder heads available today are exact reproductions of the original parts. The choice includes standard cylinders and sport cylinders with more power.
Which carburetor and intake manifold are suitable for stock or tuned setups?
Stock setups often use 12 or 14 mm Gurtner carburetors. A 15 mm Dellorto SHA carburetor can also be fitted and is easier to tune. PWK carburetors are even an option for extensive tuning projects, provided a suitable intake manifold is available.
Will an MBK 51 exhaust fit all versions?
MBK 51 exhausts are the same across all versions, at least for the AV10 engine. The main consideration is whether the exhaust matches the cylinder's performance, especially if a cylinder kit has been fitted.
Which variator and clutch fit my MBK 51 moped?
Not all 51 models have a variator, so the clutch needs to match the version with or without one. The starting method, whether kickstarter or pedals, can also affect the choice of variator. Care is needed here.
Are electronic and points ignitions interchangeable?
No, the crankshafts differ.
Will wheels, a fork, brakes, or body panels from another MBK 51 version fit?
In some cases, yes; in others, no. A close comparison of shapes and dimensions is therefore important before ordering certain parts.
Which chain, front sprocket, and rear sprocket does my MBK 51 use?
All versions require a size 415 chain. An 11 x 56 sprocket combination is common, but this can vary by version. As a general rule, a smaller front sprocket and larger rear sprocket improve acceleration at the expense of top speed. A larger front sprocket and smaller rear sprocket increase top speed at the expense of acceleration.
However, taller gearing can cause problems on an engine with limited power.
