Product Details
DESCRIPTION: NCY 139QMB upgear kit for your 50cc 4-strokes is finally here!This kit is made specifically for 88cc big bored engines and increases your gear ratio by 30%.This is the mother of all upgears for the 50cc 139QMB scoots.Only effective if you have a full blown 88cc kit with a big valve head, and stroker crank.
139QMB ENGINES: upgear kit for your 50cc 4-strokes is finally here! This kit is made specifically for 88cc big bored engines and increases your gear ratio by 30%. This is the mother of all upgears for the 50cc 139QMB scoots. Only effective if you have a full blown 88cc kit with a big valve head, and stroker crank.
Additional information
| Weight | 2 lbs |
|---|---|
| Dimensions | 6 × 4 × 2.1 in |
Compatibility / Fitment
Use the fitment details below to confirm this part matches your scooter before ordering.
- Engine Size: 50cc
- Engine Code: 139QMB
Fitment Guide: This compatibility information is based on manufacturer and supplier data. Listed models are common known applications and may not include every compatible scooter. If your scooter has multiple versions or production changes, confirm the correct match before ordering. Check photos, measurements, original part numbers, engine code, model, and related fitment information whenever possible.
Common Fitment Questions
Q: Will this fit a 139QMB engine?
A: This SKU is listed as compatible with 139QMB engine-code fitment. Always compare your original part and scooter details before ordering.
Q: Is this for 50cc scooters?
A: This SKU is listed with 50cc engine-size fitment. Confirm exact model, year, and part style before ordering.
Additional information
| Weight | 2 lbs |
|---|---|
| Dimensions | 6 × 4 × 2.1 in |





