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You are here: Home > Parts Department > Scooter Parts > Parts by Engine Model > 50cc OEM Stock 4-Stroke Engine Parts QMB139 > Drive Starter (Figure. 5)
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QMB139 Belt 669-18-30 (Short Version)
Belt - 669-18-30 (Short Case Version)
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.

Our Price: $28.99
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QMB139 Belt 729-17.5-30 (Long Version)
Belt - 729-17.5-30 (Long Case Version)
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.

Our Price: $36.99
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QMB139 Plate Drive Gear
Fig. 5 / Part No. 02
139QMB Hexagon Nut for Variator Pulley (12mm)

12mm hexagon nut.

Our Price: $1.99
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QMB139 Plate Drive Gear
Fig. 5 / Part No. 03
139QMB Washer for Variator Pulley 12mm x 20mm

12mm x 20mm Washer for Variator Pulley.

Our Price: $1.05
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QMB139 Plate Drive Gear
Fig. 5 / Part No. 04
139QMB Plate Drive Gear

Specifications:
Outer Diameter: 33.5mm
Inner Shaft Hole Diameter: 14mm
Extended 3 Points Length: 9mm

Our Price: $4.99
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QMB139 Belt Cooling Fan
Fig. 5 / Part No. 05
139QMB Belt Cooling Fan

Specifications:
Outer Diameter: 89mm
Inner Diameter: 38.5mm

Our Price: $4.99
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QMB139 Drive Gear Face
Fig. 5 / Part No. 06
139QMB Drive Gear Face

Specifications:
Outer Diameter: 113.5mm (longest point)
Inner Diameter: 14mm

Our Price: $7.49
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QMB139 Drive Face Spacer/Shaft
Fig. 5 / Part No. 07
139QMB Drive Face Spacer/Shaft

Specifications:
Length: 38mm
Outer Diameter: 20mm
Inner Diameter: 14mm

Our Price: $2.49
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QMB139 Front Variator Pulley
Fig. 5 / Part No. 08
139QMB Front Variator Pulley

Specifications:
Outer Diameter: 87.5mm
Inner Hole Diameter: 20mm
Slot For Roller Weight: 13.5mm
(Uses 16mm x 13mm Roller Weight)

Our Price: $19.95
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QMB139 Roller Weights
Fig. 5 / Part No. 09
139QMB Stock Roller Weights 16mm x 13mm / 8.5g (set of 6)

Specifications:
Diameter: 16mm
Width: 13mm
Weight: 8.5 g

Sold as set of 6

Our Price: $6.95
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QMB139 Roller Ramp Plate
Fig. 5 / Part No. 10
139QMB Variator Back Plate

Specifications:
Outer Diameter: 74.5mm
Inner Diameter: 14mm

Our Price: $3.95
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QMB139 Roller Ramp Plate Buffer
Fig. 5 / Part No. 11
139QMB Variator Back Plate Back Slides (Set of 3)

Sold as Set of 3

Specifications:
Groove Width: 10mm
Groove Depth: 8mm

Our Price: $2.95
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Roller Weight 16 X 13  (4g)
Roller Weight 16 X 13
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

Our Price: $7.20
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SLIDING ROLLER 16 X13 4GR
Slider Weights QMB 49-80cc (16X13)
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

Our Price: $34.80
Sale Price: $19.95
You Save $14.85
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Variator Pulley - High Performance variator pulley 50cc four stroke
Variator Kit - High Performance Teflon variator kit 139QMB 50cc
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

Our Price: $69.95
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Variator Pulley - QMB139 50cc (Complete Assembly)
Variator Pulley (Complete Assembly) - 139QMB 50cc
CVT variator assembly for the street legal scooters with the 139QMB 50cc engine.

Includes:
Roller Weights 8.5 gram

Our Price: $49.95
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