Premium Continuously Variable Transmission CVT Drive Belt
Replace Part Number: 669-18-30, 669 18 30
Fits 49cc 50cc GY6 QMB139 4 Stroke Engines
Outer circumference: 669 mm ( 26.3 inch), Top width: 18 mm ( 0.7 inch), Pitch: 30 degree
Good performance: Oil and heat resistant, high mileage and reliable performance ow to Select the Correct Comet Belt
1.Determine the Series Type
2.Measure the “Outer Diameter” (O.D.) of the driven pulley on the jackshaft.
3.Measure the “Center Distance” (C.D.); which is the exact distance between the center of the engine crankshaft and the center of the jackshaft. Must be precise.
4.Use the two measurements; the driven pulley outer diameter and center distance measurement to determine the correct belt part number from the relevant chart below.
Note:
Should your machine’s center distance fall between the center distance (C.D.) settings listed here, select from the two belts the one with the larger outside circumference (O.C.) for best wear and to avoid machine “creep” during idling.
Fitment:
OEM Part Number: 669-18-30, 669 18 30
This CVT Drive Belt for 49/50cc 4-stroke scooters commonly used with the QMB139 engines.
HX3187