Moturo V-belt 669mm for 139QMB QMA 10 inch

Moturo V-belt 669×18×30 for 139QMB/QMA 10-inch scooters

The Moturo V-belt 669×18×30 for scooters with 139QMB/QMA engines with 10-inch tires (Baotian and identical models, MY 05-09) — the variator wear part that transmits power from the engine to the clutch. Ready to install.

The V-belt sits between the variator and the clutch bell and transmits torque from the engine to the rear wheel. The dimensions 669×18×30 correspond to the original V-belt for 139QMB/QMA engines with 10-inch tires, the standard size for this engine class. The material compound provides good grip for original and slightly performance-tuned engines. When the belt is worn, the variator slips under load and the top speed drops – replacement is a mandatory maintenance task.

Replacement takes about half an hour with a variator holder, hex key set, and socket wrench for the variator nut.

V-belt for scooters with 139QMB engine, made by Moturo.

Performance · Material · Specs

• Dimensions 669 × 18 × 30, true to original size
• Suitable for scooters with 139QMB/QMA engines with 10-inch tires
• Material compound with good grip for original and slightly performance-tuned engines

Important notes – please read

Original spare part design, no separate ABE (general operating permit) required. Before ordering, compare the dimensions of your old V-belt with the 669×18×30 using the product image, as different model variants within the same engine family may use different belt dimensions.

Tools & Time required

• Variator holder for blocking the pulley
• Socket wrench for the variator nut
• Hex key set in common sizes
• About half an hour for an experienced mechanic

Scope of delivery

1 × V-belt 669 × 18 × 30. Not included: variator rollers, sliders, tools.

Frequently Asked Questions

Does the V-belt also fit scooters with 12-inch tires?
Not necessarily. Scooters with 10-inch and 12-inch tires often use different belt dimensions. Check the size of your old V-belt before ordering.

Where can I find the size of my old V-belt?
As a rule, the dimensions are printed on the side of the V-belt, e.g., 669×18×30.

How long does the V-belt last?
Depends on riding style and variator maintenance. Replacement at regular maintenance intervals is mandatory.