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You are here: Home > Parts Department > Scooter Parts > Parts by Engine Type > 50cc, QMB139 4-Stroke Scooter Engine Parts
Clinder Head Cover (Fig. 1) Cylinder Head (Fig. 2)
Cylinder (Fig. 3) Left Crankcase Cover (Fig. 4)
Drive Starter (Fig. 5) Driven Puller (Fig. 6)
Starting Motor Clutch (Fig. 7) Stator Comp (Fig. 8)
Cover Of Crankcase RH (Fig. 9) Generator of Oil Pump (Fig. 10)
Crankcase RH (Fig. 11) Cover of Gearcase (Fig. 12)
Crankcase LH (Fig. 13) Cover (Fig. 14)
Carburetor (Fig. 15)
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Belt - 669-18-30 - Gates Powerlink Belt - 729-17.5-3 - Gates Powerlink Belt - 743-20-30 - Gates Powerlink
Our Price: $29.95
Our Price: $29.95
Our Price: $29.95
Belt - 669-18-30 - Gates Powerlink, Made in the USA Belt - 729-17.5-3 - Gates Powerlink, Made in the USA Belt - 743-20-3 - Gates Powerlink, Made in the USA
Belt Size:
669 mm Length
18 mm Width
3 mm teeth spacing
Belt Size:
729 mm Length
17.5 mm Width
3 mm Teeth
Belt Size:
743 mm Length
20 mm Width
3 mm Teeth
BELT 669-18/30 50CC 4 STROKE (Kevlar) Carburetor - QMB139, 49/50cc Four Stroke CDI - QMB139 50cc
Our Price: $49.95
Our Price: $59.95
Our Price: $18.00
BELT 669-18/30 50CC 4 STROKE Carburetor - QMB139, 49/50cc Four Stroke CDI Assembly
BELT 669-18/30 (Kevlar)
Commonly used on 50cc four stroke scooters.
Made of high grade Kevlar for longer life.
Carburetor for the 49.5cc Street Legal Scooter. This carburetor fits the 139QMB engine.
(19mm engine aperture, 38mm air filter mount.)
CDI assembly for street legal scooters with a 139QMB engine .  This CDI assembly fits the 139QMB engine.
Clutch and Bell Housing - Stock Clutch and bell housing for the QMB139 50cc Clutch Pads - High Performance Clutch QMB139 49.5/50cc and Honda DIO Clutch Spring set - GY6 50cc High Performance (1000 RPM)
Our Price: $49.95
Our Price: $55.95
Our Price: $10.00
Clutch Bell Housing and Clutch Assembly
Clutch bell housing and clutch assembly for Chinese street legal scooters.  This clutch bell housing and clutch assembly fits the 139QMB engine. Performance Racing Clutch for the QMB139 49.5/50cc and Honda DIO engine. High performance clutch springs for the GY6 / QMB139 59cc engine.
Clutch Spring set - GY6 50cc High Performance (1500 RPM) Clutch Spring set - GY6 50cc High Performance (2000 RPM) CVT Actuator Assembly
Our Price: $10.00
Our Price: $10.00
Our Price: $60.00
CVT Actuator Assembly
High performance clutch springs for the GY6 / QMB139 59cc engine. High performance clutch springs for the GY6 / QMB139 59cc engine. CVT assembly for the street legal scooters with the 139QMB engine. This CVT actuator assembly fits the 139QMB engine.
Cylinder Body Cylinder Head Rebulid Kit - GY6 / QMB139 50cc Ignition Coil
Our Price: $18.00
Our Price: $63.00
Our Price: $25.00
Cylinder Body Ignition Coil
Cylinder body for the 49.5/50cc street legal Chinese scooters. This cylinder body fits the 139QMB engine. Cylinder head rebuild kit for GY6 / QMB139 50cc engine. Includes : Cylinder Head, Cam Shaft, Rocker Arms, Valves and Gaskets. Ignition coil for the Cyclone street legal scooter.  This ignition coil fits the 139QMB engine.
Intake Manifold - GY6 / QMB139 50cc Key - Blank key for Chinese scooters and pocket bikes LUGGAGE BOX BLACK W/RED LAMP
Our Price: $20.00
Our Price: $4.00
Our Price: $119.95
Blank key for Chinese scooters and pocket bikes LUGGAGE BOX BLACK W/RED LAMP
Blank key for Chinese scooters and pocket bikes Fits on any scooter with a rear rack (Universal mounting brackets). Includes rear reflector with 12v L.E.D. light, that can be wired to your brake light. Lockable storage and box can be easily removed to carry your personal belongings with you.  Hard graphite composite plastic for ultimate durability. This MRP luggage box is available in only flat black. The integrated stop light assembly does not need to be connected but is strongly recommended since it’s easy to adapt to most scooters.
Oil Seal - Set Piston Piston Ring Set - QMB139 49.5cc / 50cc
Our Price: $25.00
Our Price: $15.00
Our Price: $12.00
Oil Seal - Set Piston
Crank case seals for the 49.5cc Cyclone street legal scooter. These crank case seals fits the 139QMB engine. Piston for the 49.5cc Cyclone street legal scooter. This piston fits the 139QMB engine. Piston ring set for the QMB139 49.5cc / 50cc engine.
Pully - GY6 / QMB139 50cc High Performance Pully Rocker Arm Assembly - QMB149 50cc ROLLER ROUND-16 X 13 (7.5g)
Our Price: $32.00
Our Price: $39.95
Our Price: $14.40
Rocker arm assembly for the 50cc QMB139 engine. ROLLER ROUND-16X13-7.5GR
Rocker arm assembly for the 50cc QMB139 engine. ROLLER ROUND-16X13-7.5GR
ROLLER WEIGHT 16 X 13 (10.5g) ROLLER WEIGHT 16 X 13 (10g) ROLLER WEIGHT 16 X 13 (11g)
Our Price: $7.20
Our Price: $7.20
Our Price: $7.20
ROLLER WEIGHT 16 X 13  10.5G ROLLER WEIGHT 16 X 13  10G ROLLER WEIGHT 16 X 13  11G
ROLLER WEIGHT 16 X 13  10.5G ROLLER WEIGHT 16 X 13  10G ROLLER WEIGHT 16 X 13  11G
ROLLER WEIGHT 16 X 13 (12g) ROLLER WEIGHT 16 X 13 (4g) ROLLER WEIGHT 16 X 13 (5.5g)
Our Price: $7.20
Our Price: $7.20
Our Price: $7.20
ROLLER WEIGHT 16 X 13  12G ROLLER WEIGHT 16 X 13  4G ROLLER WEIGHT 16 X 13  5.5G
ROLLER WEIGHT 16 X 13  12G ROLLER WEIGHT 16 X 13  4G ROLLER WEIGHT 16 X 13  (5.5g)
ROLLER WEIGHT 16 X 13 (5g) ROLLER WEIGHT 16 X 13 (6.5g) ROLLER WEIGHT 16 X 13 (6g)
Our Price: $7.20
Our Price: $7.20
Our Price: $7.20
ROLLER WEIGHT 16 X 13  5G ROLLER WEIGHT 16 X 13  6.5G ROLLER WEIGHT 16 X 13  6G
ROLLER WEIGHT 16 X 13  5G ROLLER WEIGHT 16 X 13  6.5G ROLLER WEIGHT 16 X 13  6G
ROLLER WEIGHT 16 X 13 (7.5g) ROLLER WEIGHT 16 X 13 (8.5g) ROLLER WEIGHT 16 X 13 (8g)
Our Price: $7.20
Our Price: $7.20
Our Price: $7.20
ROLLER WEIGHT 16 X 13  7.5G ROLLER WEIGHT 16 X 13  8.5G ROLLER WEIGHT 16 X 13  8G
ROLLER WEIGHT 16 X 13  7.5G ROLLER WEIGHT 16 X 13  8.5G ROLLER WEIGHT 16 X 13  8G
ROLLER WEIGHT 16 X 13 (9.5g) ROLLER WEIGHT 16 X 13 (9g) DIO SLIDING ROLLER 16 X 13 (4.5g) DIO
Our Price: $7.20
Our Price: $7.20
Our Price: $34.80
ROLLER WEIGHT 16 X 13  9.5G ROLLER WEIGHT 16 X 13  9G DIO SLIDING ROLLER 16X13 4.5GR DIO
ROLLER WEIGHT 16 X 13  9.5G ROLLER WEIGHT 16 X 13  9G DIO SLIDING ROLLER 16X13 4.5GR DIO
SLIDING ROLLER 16 X 13 (4g) SLIDING ROLLER 16 X 13 (5g) SLIDING ROLLER 16 X 13 (6.5g)
Our Price: $34.80
Our Price: $34.80
Our Price: $34.80
SLIDING ROLLER 16 X13 4GR SLIDING ROLLER 16 X13 5GR SLIDING ROLLER 16 X13 6.5GR
SLIDING ROLLER 16 X13 4GR SLIDING ROLLER 16 X13 5GR SLIDING ROLLER 16 X13 6.5GR
SLIDING ROLLER 16 X 13 (6g) SLIDING ROLLER 16 X 13 (7.5g) SLIDING ROLLER 16 X 13 (7g)
Our Price: $34.80
Our Price: $34.80
Our Price: $34.80
SLIDING ROLLER 16 X13 6G SLIDING ROLLER 16 X13 7.5GR SLIDING ROLLER 16 X13 7GR
SLIDING ROLLER 16 X13 6G SLIDING ROLLER 16 X13 7.5GR SLIDING ROLLER 16 X13 7GR
SLIDING ROLLER 16 X 13 (8g) SLIDING ROLLER 16 X 13 (9g) SLIDING ROLLER 16 X13 (5.5g)
Our Price: $34.80
Our Price: $34.80
Our Price: $34.80
SLIDING ROLLER 16 X13 8GR SLIDING ROLLER 16X13 9GR SLIDING ROLLER 16X13 5.5G
SLIDING ROLLER 16 X13 8GR SLIDING ROLLER 16X13 9GR SLIDING ROLLER 16X13 5.5G
SLIDING ROLLER 16X 13 (8.5g) SLIDING ROLLERS 16 X 13 (10g) SLIDING ROLLERS-16 X 13 (13g)
Our Price: $34.80
Our Price: $34.80
Our Price:
SLIDING ROLLER 16X13 8.5GR SLIDING ROLLERS 16X13-10GR SLIDING ROLLERS-16X13-13GR
SLIDING ROLLER 16X13 8.5GR SLIDING ROLLERS 16X13-10GR SLIDING ROLLERS-16X13-13GR
Solenoid Spark Plug Spark Plug - Iridium High Performance Spark Plug (CR8HIX)
Our Price: $12.00
Our Price: $4.00
Our Price: $16.00
Solenoid Spark Plug
This solenoid fits the 139QMB engine. Spark plugs seals for the 49.5cc Cyclone street legal scooter. This spark plug fits the 139QMB engine. Made with Iridium, Stronger then Platinum, Higher melting point.
Requires less voltage to spark, burns more of the fuel in the cylinder, sparks at leaner air/fuel mixtures.
Works on 50-150cc GY6 Scooter Engines.
Starter - Bendix Spring Mechanism Starter Motor Stator - Stator for the 50cc QMB139 four stroke engine.
Our Price: $22.00
Our Price: $50.00
Our Price: $31.95
Starter motor bendix spring Mechanism for the 50cc QMB139 engine. Starter Motor Stator - Stator for the 50cc QMB139 four stroke engine.
Starter motor bendix spring Mechanism for the 50cc QMB139 engine. Starter motor for the Cyclone street legal scooter. This starter motor fits the 139QMB engine. Stator for the 50cc QMB139 four stroke engine.
Stator - Stator for the 50cc QMB139 four stroke engine. Valve set - QMB139 49.5/50cc Engine Variator - High Performance variator 50cc four stroke
Our Price: $56.99
Our Price: $19.00
Our Price: