Secondary Gear Kit NCY 17/41 for GY6 139QMB/QMA

The NCY QMB139 upgrade kit for your 50cc 4-stroke is finally here! This kit is specifically designed for 88cc big bore engines and increases your gear ratio by 30%. This is the mother of all upgrades for 50cc qmb139 scooters. Only effective if you have a full 88cc kit with a big valve head and stroker crank.

The NCY QMB139 upgrade kit for your 50cc 4-stroke is finally here! This kit is specifically designed for 88cc big bore engines and increases your gear ratio by 30%. This is the mother of all upgraded equipment for 50cc qmb139 scooters. Only effective if you have a complete 88cc kit with a big valve head and stroker crank.

Specifications:

• Type: Secondary
• Ratio: 17/41 (2.41)
• Assembly: Press