Durable 669mm CVT Drive Belt For 49cc 50cc GY6 139QMB Short Case Engines Fits Scooters ATVs Go Karts Mopeds 18mm Wide With 30 Degree Teeth Compatible With Roketa Baja Sunl Jonway Taotao JM Star For Smooth Power Delivery

Single-belt 669mm CVT Drive Belt for 49-50cc GY6 Scooters
✔️ 669mm long, 18mm wide, 30° tooth angle, fits 139QMB short-case

This drive belt is designed for 49cc-50cc GY6 short-case engines used in scooters, ATVs, go-karts, and mopeds. It delivers smooth power transmission and reliable performance under everyday riding conditions.

✅ Length: 669mm (26.34"), Width: 18mm (0.71"), Teeth angle: 30°
✅ Part number 669-18-30; 4-layer construction with top fabric, EPDM rubber, aramid fiber cord, and adhesion gum
✅ Oil and dust resistant; built to handle high temps and tough conditions
✅ Compatible with Roketa, Baja, Sunl, Taotao, JM Star, Jonway, Verucci and other 49cc-50cc GY6 short-case engines
✅ Easy to install: place belt on moving pulley first and test-run for 5 minutes

💡 What is a CVT drive belt and why is it handy for small-engine scooters?

- A CVT drive belt transmits engine torque to the pulleys in a CVT system, enabling smooth acceleration and reliable engagement across speeds - It helps maintain proper belt tension and reduces slippage, boosting ride consistency under load - For 49cc-50cc GY6 short-case engines like 139QMB, choosing the right length and tooth angle matters for optimal power transfer - Regular inspection helps extend belt life and keep performance steady over time