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You are here: Home > Parts Department > Scooter Parts > Parts by Engine Model > 50cc OEM Stock 4-Stroke Engine Parts QMB139 > Cylinder Head (Figure. 2)
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Big Bore kit 50 to 80cc Upgrade - 139QMB
Need more acceleration and top speed or just simply need to rebuild you head? If yes, then you need to upgrade your 50cc to an 80cc with this big bore kit. Fits the 50cc 139QMB engine.

Click on image for more info
Our Price: $159.95 		Qty Add
QMB139 50cc Intake Manifold Insulator
Carburetor Intake Manifold Insulator - 139QMB 50cc
Intake Manifold Insulator for the 139QMB 50cc engines.

Click on photo for more info.
Our Price: $2.99 		Qty Add
Cylinder Head Rebulid Kit - 139QMB
Cylinder head rebuild kit for GY6 / 139QMB 50cc engine. Includes : Cylinder Head, Cam Shaft, Rocker Arms, Valves and Gaskets. Kit comes with valves installed as shown in the picture.
Our Price: $69.99 		Qty Add
QMB139 50cc Rocker Arms Upper Housing
Fig. 2 / Part No. 01
139QMB Hexagon Nut 7mm for Rocker Arms Upper Housing (Set of 4)


Our Price: $1.05 		Qty Add
QMB139 50cc Rocker Arms Upper Housing
Fig. 2 / Part No. 02
139QMB Washer 7x14mm for Rocker Arms Upper Housing (Set of 4)


Our Price: $0.63 		Qty Add
QMB139 50cc Rocker Arms Upper Housing
Fig. 2 / Part No. 03
139QMB Rocker Arms Upper Housing


Our Price: $19.95 		Qty Add
QMB139 50cc Rocker Valves
Fig. 2 / Part No. 04
139QMB Rocker Valves (Set of 2)


Our Price: $15.99 		Qty Add
QMB139 50cc Valve Adjustment Bolt
Fig. 2 / Part No. 05
139QMB Valve Adjustment Bolt (Set of 2)


Our Price: $2.49 		Qty Add
QMB139 50cc Valve Adjustment Nuts
Fig. 2 / Part No. 06
139QMB Valve Adjustment Nut 5mm (Set of 2)


Our Price: $1.15 		Qty Add
QMB139 50cc Rocker Valves Inlet Shaft / Pin.
Fig. 2 / Part No. 07
139QMB Rocker Valves Inlet Shaft / Pin.


Our Price: $4.99 		Qty Add
QMB139 50cc Rocker Valve Exhaust Shaft
Fig. 2 / Part No. 08
139QMB Rocker Valve Exhaust Shaft


Our Price: $2.15 		Qty Add
QMB139 50cc Holder Cam Shaft
Fig. 2 / Part No. 09
139QMB Holder Cam Shaft


Our Price: $25.99 		Qty Add
QMB139 50cc Pin 8×14
Fig. 2 / Part No. 10
139QMB Pin 8×14mm (Set of 2)


Our Price: $0.67 		Qty Add
QMB139 50cc Bolt 6×85mm
Fig. 2 / Part No. 11
139QMB Bolt 6×85mm (Set of 2)


Our Price: $0.99 		Qty Add
QMB139 50cc Insulator O-Ring
Fig. 2 / Part No. 13
139QMB Gasket for Insulator


Our Price: $0.67 		Qty Add
QMB139 50cc Cylinder Head
Fig. 2 / Part No. 14
139QMB Cylinder Head


Our Price: $39.95 		Qty Add
QMB139 50cc Exhaust Valve
Fig. 2 / Part No. 15
139QMB Exhaust Valve


Our Price: $8.99 		Qty Add
QMB139 50cc Valve Outer Spring
Fig. 2 / Part No. 16
139QMB Valve Outer Spring


Our Price: $3.49 		Qty Add
QMB139 50cc Valve Inner Spring
Fig. 2 / Part No. 17
139QMB Valve Inner Spring


Our Price: $3.25 		Qty Add
QMB139 50cc Valve Cotter
Fig. 2 / Part No. 18
139QMB Valve Cotter


Our Price: $2.99 		Qty Add
QMB139 50cc Holder
Fig. 2 / Part No. 19
139QMB Holder


Our Price: $3.49 		Qty Add
QMB139 50cc Inlet Valve Intake
Fig. 2 / Part No. 20
139QMB Inlet Valve Intake


Our Price: $8.99 		Qty Add
QMB139 50cc Valve Guide Inlet Valve
Fig. 2 / Part No. 21
139QMB Valve Guide Inlet Valve


Our Price: $5.49 		Qty Add
QMB139 50cc Valve Guide Exhaust Valve
Fig. 2 / Part No. 22
139QMB Valve Guide Exhaust Valve


Our Price: $5.49 		Qty Add
QMB139 50cc Valve Oil Seal
Fig. 2 / Part No. 23
139QMB Valve Oil Seal


Our Price: $2.99 		Qty Add
QMB139 50cc Valve Washer
Fig. 2 / Part No. 24
139QMB Valve Washer


Our Price: $0.99 		Qty Add
QMB139 50cc Valve Spring Seat
Fig. 2 / Part No. 25
139QMB Valve Spring Seat


Our Price: $2.99 		Qty Add
QMB139 50cc Stud Bolt 6mm x 32mm
Fig. 2 / Part No. 26
139QMB Stud Bolt 6x32mm (Set of 2)


Our Price: $1.10 		Qty Add
QMB139 50cc Stud Bolt 6mm x 65mm
Fig. 2 / Part No. 27
139QMB Stud Bolt 6x65mm (Set of 2)


Our Price: $1.49 		Qty Add
QMB139 50cc Valve Guide O-Ring
Fig. 2 / Part No. 28
139QMB Valve Guide O-Ring


Our Price: $0.99 		Qty Add
QMB139 50cc Gasket of Cylinder Head
Fig. 2 / Part No. 29
139QMB Gasket for Cylinder Head


Our Price: $8.99 		Qty Add
QMB139 50cc Leader of Inlet Valve Intake
Fig. 2 / Part No. 30
139QMB Leader of Inlet Valve Intake


Our Price: $4.49 		Qty Add
Gasket Set - QMB 50cc (Long Case Version 17 inch)
Click on image for more info.
Our Price: $15.99 		Qty Add
Gasket Set - QMB 50cc (Short Case Version 15 7/8 inch)
Click on image for more info.
Our Price: $15.99 		Qty Add
Gasket Set - QMB 60cc (Complete)
Complete Gasket set for GY6 / 139QMB 60cc engine
Our Price: $20.00 		Qty Add
Rocker arm assembly for the 50cc QMB139 engine.
Rocker Arm Assembly - QMB139 50cc
Rocker arm assembly for the 50cc 139QMB engine.
Our Price: $39.95 		Qty Add
QMB139 50cc Spark Plug
Spark Plug - QMB 50cc to GY6 150cc


Our Price: $2.99 		Qty Add
Valve set - 139QMB 50cc Engine (complete set)
Valve set for th GY6 / 139QMB 49.5/50cc engine.  Valve Size: Big valve 18mm diameter and Small valve 15mm diameter.
Our Price: $19.00 		Qty Add
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