Products

Universal Parts 69mm Valve Assembly for 50cc 4-stroke QMB139. Includes intake and exhaust valves, inner and outer springs, valve washers, valve sea...

Universal Parts CVT cover for short case 50cc, 4-stroke QMB139 engines. This cover includes the kick start mechanism which has been pre-installed f...

50cc QMB139 4-stroke Cylinder and Head Kit With 69mm Valves. Choose from 39mm, 47mm or 50mm bore in the Drop Down Box. 47mm Bore Upgrades your Scoo...

Complete cylinder and head kit for QMB139 4-stroke 50cc engines. Choose from 39mm (stock), 47mm (72cc upgrade), or 50mm (81.3cc upgrade) bore from ...

Universal Parts PAIR Style (Emissions) Cylinder Head for 50cc 4-stroke QMB139 engines. PAIR is an acronym for Pulsed Secondary Air Injection System...

Universal Parts Drive Face Gear for 50cc 4-stroke QMB139 engines and engine based scooters. Outer Diameter: 4 ½ inches Inner Diameter: 13mm Splines...

Universal Parts 64mm Exhaust Valve for 50cc 4-stroke QMB139 engines. Valve Diameter: 16mm Shaft Diameter: 5mm Overall length: 64mm QMB139 50cc/49cc...

Universal Parts 69mm Exhaust Valve for 50cc 4-stroke QMB139 engines. Valve Diameter: 16mm Shaft Diameter: 5mm Overall length: 69mm QMB139 50cc/49cc...

Universal Parts Final Gears for QMB139. Choose 51 or 52 Tooth From The Drop Down Menu. 52 Tooth Option on Clearance. 51 tooth is found in short cas...