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You are here: Home > Parts Department > Scooter Parts > Parts by Scooter Model > MD50QT-4, 49/50cc Scooter Parts
Stock Engine Parts

High Performance Parts
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Battery - 3 A BS Battery - 7 A BS Battery - 9 A BS
Our Price: $39.99
Sale Price: $34.95
You Save $5.04
Our Price: $49.99
Sale Price: $39.95
You Save $10.04
Our Price: $59.99
Sale Price: $49.95
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Battery - Yuasa, Made in the USA Battery - Yuasa, Made in the USA Battery - Yuasa, Made in the USA
Dimensions: 5.875" x 3.75" x 3.375"
Voltage - 12v
Capacity - 6Ah
Weight - 2.5 Kg
Charging Current - 0.6 A
Dimensions: 5 7/8" x 4" x 3 3/8"
Voltage - 12v
Capacity - 9Ah
Weight - 2.5 Kg
Charging Current - 0.9A

GTX9A-BS
Belt - 669-18-30 (Short Case Version) Belt - 729-17.5-30 (Long Case Version) Belt - 743-20-30
Our Price: $28.99
Our Price: $36.99
Our Price: $32.99
QMB139 Belt 669-18-30 (Short Version) QMB139 Belt 729-17.5-30 (Long Version) Scooter Belt - 743-20-3
Belt Size:
669 mm Length
18 mm Width
30 degree tooth angle

FAQ: How do I know if I have a long or short case? The long case measures 17" and the Short case measures 15 7/8" these measurements are base on where the gasket sits on your cvt cover.
Belt Size:
729 mm Length
17.5 mm Width
30 degree tooth angle

Compatible with the 729-17-30 belt size.

FAQ: How do I know if I have a long or short case? The long case measures 17" and the Short case measures 15 7/8" these measurements are base on where the gasket sits on your cvt cover.
Belt Size:
743 mm Length
20 mm Width
30 degree tooth angle
Belt - 743-20-30 (Kevlar) Belt - 835-20-30 Belt - 835-20-30 (Kevlar)
Our Price: $53.99
Our Price: $34.99
Our Price: $55.99
Scooter Belt - 743-20-3 Kevlar Scooter Belt - 835-20-30 Scooter Belt - 835-20-30 Kevlar
Belt Size:
743 mm Length
20 mm Width
30 degree tooth angle

This belt is made with a durable bullet proof Kevlar material and last longer than the stock belt.
Belt Size:
835 mm Length
20 mm Width
30 degree tooth angle
Belt Size:
835 mm Length
20 mm Width
30 degree tooth angle

This belt is made with a durable bullet proof Kevlar material and last longer than the stock belt.
Brake Cable - 74 inch Brake Cable - 78 inch Brake Lever - Hydraulic Brake Lever (Right Side)
Our Price: $23.00
Our Price: $23.00
Our Price: $9.95
Brake cable overall length: 74 inches/ 198.12cm Brake Cable - Rear Right Hydraulic Brake Lever
Brake cable overall length: 74 inches/ 188 cm / 1880 mm Brake cable overall length: 78 inches/ 198.12cm Right Hydraulic Brake Lever
Brake Lever - Left Brake Brake Lever Switch Brake Shoes - Drum Style for 139QMB 50cc Scooters
Our Price: $14.95
Our Price: $4.49
Our Price: $17.99
Lever - Left Brake Brake pads for QMB139 50cc Scooters
Scooter Left Brake Lever. Compatible with many scooters that use the same style lever. Universal brake lever switch for scooters, dirt bikes, atvs and more....

Specifications:
Switch Diameter- 8mm
Switch Length- 31mm
Overall Length- 425.25 mm(16-3/4")
Switch Pin Diameter- 3mm
Specifications:
Outer Diameter: 106mm
Thickness: 25mm
Carburetor - 139QMB 50cc (Kunfu Brand) Carburetor Intake Manifold - 139QMB 50cc CDI - 139QMB 50cc
Our Price: $59.99
Our Price: $19.95
Our Price: $14.95
QMB139 50cc Carburetor CDI Assembly
Stock Carburetor for the 49/50cc 139QMB 4-stroke engines.

Specifications:
Diameter: 38.5mm / 1.5 inches
Brand: KUNG FU
Specifications:
Mounting Holes Spacing: 45mm (center to center)
Intake Metal side: 18mm
Intake Rubber Side: 27mm
CDI assembly for the 139QMB 50cc engine
Clutch and bell housing Assembly (Stock) - 139QMB 50cc Clutch Pads - High Performance Clutch 139QMB 50cc and Honda DIO Clutch Pads - MRP High Performance Clutch 50cc 139QMB and Honda DIO (includes 3 sets of springs)
Our Price: $49.95
Our Price: $59.99
Our Price: $63.99
QMB139 Clutch Bell Housing MRP High Performance Clutch 50cc
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 139QMB 49.5/50cc and Honda DIO engine. High performance clutch kit for the 50cc 139QMB and Honda DIO engines.
Clutch kit includes three sets of springs.
Clutch Spring set - 139QMB 50cc High Performance (1000 RPM) Clutch Spring set - 139QMB 50cc High Performance (1500 RPM) Clutch Spring set - 139QMB 50cc High Performance (2000 RPM)
Our Price: $9.95
Our Price: $9.95
Our Price: $9.95
Clutch Spring set - DIO/QMB 50cc High Performance (1500 RPM)
High performance clutch springs for the GY6 / 139QMB 50cc engine.
Fits the Honda DIO and 50cc Chinese scooters.
High performance clutch springs for the GY6 / 139QMB 49cc engine.
Fits the Honda DIO and 50cc Chinese scooters.
High performance clutch springs for the GY6 / 139QMB 50cc engine.
Controller - Left controller with switches and brake lever Controller - Start Button and Headlight Switch Assembly (Right Side) Controller - Turn Signal, Horn and High/ Low Beam Switch Assembly (Left Side)
Our Price: $29.95
Our Price: $35.00
Our Price: $35.00
Left controller with switches and brake lever Start Button and Headlight Switch Assembly Turn Signal, Horn and High/ Low Beam Switch Assembly
Left controller with switches and brake lever Start button and headlight switch assembly for the Cyclone street legal scooter. Turn signal, horn and high/ low beam switch assembly for the Cyclone street legal scooter.
Cylinder Head Rebulid Kit - 139QMB Fig. 3 / Part No. 01
139QMB Cylinder 50cc
Fig. 7 / Part No. 07
139QMB Starter Clutch
Our Price: $69.99
Our Price: $49.95
Our Price: $29.99
QMB139  Cylinder 50cc QMB139 Starter Clutch
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.

Flasher Fuel Sensor Unit - Float Fuel Sensor Unit - Float
Our Price: $6.95
Our Price: $29.95
Our Price: $29.95
Flasher Fuel Sensor Unit - Float Fuel Sensor Unit - Float
Turn signal flasher for the Cyclone street legal scooter or other similar models with a 139QMB engine. Float unit, sensor and wiring for the Cyclone street legal scooter or other similar models with the 139QMB Engine. Float unit, sensor and wiring for the Cyclone street legal scooter or other similar models with the 139QMB Engine.
Head Light Horn Assembly Ignition Coil (Stock) - QMB 50 to GY6 150cc
Our Price: $49.95
Our Price: $3.95
Our Price: $19.99
head light for scooter Horn Assembly Ignition Coil
Includes light bulb. Horn for the Cyclone street legal scooter. Ignition coil for the 4-stroke Chinese street legal scooters. Ignition coil fits the 139QMB/ GY6 125/150cc engine.
Key - Blank key for Chinese scooters and pocket bikes Key Switch Group - C Lock - Seat Trunk Lock
Our Price: $3.95
Our Price: $49.95
Our Price: $24.95
Blank key for Chinese scooters and pocket bikes Complete key switch set. Seat Trunk Lock
Blank key for Chinese scooters and pocket bikes Complete key switch set.

Includes:
Ignition switch
Trunk Lock
Seat Trunk Lock
Luggage Box - Model 1 Luggage Box - Model 2 Magneto/Stator - 139QMB 50cc
Our Price: $89.99
Sale Price: $59.95
You Save $30.04
Our Price: $84.99
Sale Price: $49.95
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Our Price: $39.99
LUGGAGE BOX BLACK W/RED LAMP LUGGAGE BOX BLACK W/RED LAMP QMB139 Magneto Stator
Universal luggage box for all scooters with rear mounting rack. Includes rear reflector, lock, keys and all mounting hardware. Made from durable black graphite plastic. Easy to install.

Dimensions: 23L X 18W X 12H inches.
Universal luggage box for all scooters with rear mounting rack. Includes rear reflector, lock, keys and all mounting hardware. Made from durable graphite plastic. Easy to install.

Dimensions: 17L X 15W X 11H inches.
Specifications:
Total diameter: 88mm
Center inner diameter: 29mm
Center Bolts (center to center): 41mm
Stator: 8 coils
Plug: 3 pin
Wires: 2 loose wires
Magneto/Stator Drum - 139QMB 50cc Mirrors - Left Side Mirrors for 50cc/ 150cc Scooters Mirrors - Right Side Mirrors for 50cc/ 150cc Scooters
Our Price: $29.99
Our Price: $12.95
Our Price: $12.95
QMB139 Stator Housing Left Side Mirror for 50cc/ 150cc Scooters. Right Side Mirror for 50cc/ 150cc Scooters.
Specifications:
Overall diameter:  112mm
Inner diameter:  90mm
Shaft diameter:  14mm (inside)
Inner shaft has a Woodruff key slot
Left Side Mirror for 50cc/ 150cc Scooters.

Specs:
8mm - Thread Size
Standard clockwise rotation to tighten.
Right Side Mirror for 50cc/ 150cc Scooters.

Specs:
8mm - Thread Size
Standard clockwise rotation to tighten.
Petcock Fuel Valve Piston Ring Set (stock) - 139QMB 50cc Rim - Front
Our Price: $14.95
Our Price: $19.99
Our Price: $59.95
Scooter Petcock Valve QMB139 Piston Rings 50cc (Complete Set) Rim - Front
Universal petcock valve. This valve is usually mounted on the bottom of the gas tank and work on vacuum. Includes:
Part No. 14, 15 and 16

Specifications:
Diameter: 39mm
Includes bearings
Rim - Rear Rocker Arm Assembly - QMB149 50cc Roller Weight 16 X 13
Our Price: $59.95
Our Price: $39.95
Our Price: $7.20
Rim - Rear Rocker arm assembly for the 50cc QMB139 engine. Roller Weight 16 X 13  (4g)
Rocker arm assembly for the 50cc 139QMB engine. Roller Weight 16 X 13
Comes as set of 6 weights.  
Fits the Honda DIO and 50cc Chinese Scooters.
Sizes: 4g, 4.5g , 5g, 5.5g, 6g, 6.5g, 7g, 7.5g, 8g, 8.5g, 9g, 9.5g, 10g, 10.5g, 11g
Roller Weights 18 X 14 Slider Weights QMB 49-80cc (16X13) Solenoid
Our Price: $9.95
Our Price: $34.80
Sale Price: $19.95
You Save $14.85
Our Price: $12.95
Scooter Roller Weight 18 X 14 SLIDING ROLLER 16 X13 4GR Solenoid
Roller Weight 18mm X 14mm
Comes as set of 6 weights.  
Fits the GY6 125 and 150cc Chinese Scooters.
Sizes: 8g, 8.5g, 9g, 9.5g, 10g, 10.5g, 11g, 11.5g, 12g, 12.5g, 13g, 13.5g, 14g, 14.5g, 15g, 15.5g, 16g, 16.5g, 17g, 17.5, 18g
These slider weight's replace your stock roller weights. They will help improve your take off speed (low end torque) while increasing your mid range torque, as well as your overall top end speed. This is by far the easiest and cheapest modification you can do to your engine to achieve great results.

SLIDING ROLLER 16 X13

Comes as set of 6 weights.  
Fits the Honda DIO and 50cc to 80cc Chinese Scooters.
Sizes: 4g, 4.5g , 5g, 5.5g, 6g, 6.5g, 7g, 7.5g, 8g, 8.5g, 9g, 9.5g, 10g, 10.5g, 11g
This solenoid fits the 139QMB engine.
Spark Plug - Iridium High Performance Spark Plug (CR8HIX) Spark Plug - QMB 50cc to GY6 150cc Speedometer
Our Price: $12.95
Our Price: $2.99
Our Price: $49.95
QMB139 50cc Spark Plug Speedometer for 50cc - 150cc retro style scooter.
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.

Speedometer for 50cc - 150cc retro style scooter.
Speedometer Cable Starter Motor - 139QMB 50cc Throttle Cable - 71 inch with 90 degree elbows ( Version A)
Our Price: $19.95
Our Price: $34.95
Our Price: $19.95
Speedometer Cable QMB139 Starter Motor GY6 Throttle Cable - 71 inch with 90 degree elbows
Speedometer for the Cyclone street legal scooter. Throttle Cable - 71 inch with 90 degree elbows ( Version A)
Throttle Cable - 75 inch with 90 degree elbows ( Version A) Throttle Cable - 75 inch with 90 degree elbows ( Version B) Throttle Cable - 80 inch with 90 degree elbows ( Version A)
Our Price: $18.95
Our Price: $18.95
Our Price: $19.95
GY6 Throttle Cable - 75 inch with 90 degree elbows Throttle Cable 75 inch with 90 degree elbows. Throttle Cable - 80 inch with 90 degree elbows ( Version A)
Throttle Cable - 75 inch with 90 degree elbows ( Version A) Throttle Cable - 75 inch with 90 degree elbows ( Version B) Throttle Cable - 80 inch with 90 degree elbows ( Version A)

Note: This cable has a 90 degree bend on both ends with threads on both ends.
Throttle Cable - 80 inch with 90 degree elbows ( Version B) Throttle Cable - 86 inch with 90 degree elbows ( Version A) Throttle Grip - Left Side
Our Price: $19.95
Our Price: $19.95
Our Price: $6.99
Throttle Cable - 80 inch with 90 degree elbows ( Version B) GY6 Throttle Cable - 86 inch with 90 degree elbows Universal grip (fits left side only).
Throttle Cable - 80 inch with 90 degree elbows ( Version B)

Note: This cable has a 90 degree bend on both ends with threads on carburetor hook up end.
Throttle Cable - 86 inch with 90 degree elbows ( Version A) Universal grip (fits left side only).
Throttle Grip - Right Side Tire - 3.50-10 (Duro) Tube - 3.50-10
Our Price: $7.99
Our Price: $32.43
Our Price: $8.95
Universal throttle grip (right side). Includes plastic inner tube for throttle cable hook up. Tire - 3.50-10 (Duro) Tube - 3.50-10
Universal throttle grip (right side). Includes plastic inner tube for throttle cable hook up. Tire Size: 3.50-10
Brand Duro
Tube Size: 3.50-10
Valve set - 139QMB 50cc Engine (complete set) Variator Kit - High Performance Teflon variator kit 139QMB 50cc Variator Pulley (Complete Assembly) - 139QMB 50cc
Our Price: $19.00
Our Price: $69.95
Our Price: $49.95
Variator Pulley - High Performance variator pulley 50cc four stroke Variator Pulley - QMB139 50cc (Complete Assembly)
Valve set for th GY6 / 139QMB 49.5/50cc engine.  Valve Size: Big valve 18mm diameter and Small valve 15mm diameter. High performance Teflon variator pulley kit for the 139QMB 50-80cc engine. And the Honda Metropolitan and Ruckus 50cc 4T.

Includes:
Front Pulley
Back Plate
Buffer Slides
3 sets of roller weights 6.5, 7.5g and 8.5g
CVT variator assembly for the street legal scooters with the 139QMB 50cc engine.

Includes:
Roller Weights 8.5 gram
Voltage Regulator, 12V Wire Harness Assembly
Our Price: $9.95
Our Price: $18.00
Voltage Regulator, 12V Wire Harness Assembly
Universal 12 volt, voltage regulator 4 prong. Wire harness assembly for the Cyclone street legal scooter.