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69mm Valve GY6 Big Bore Kit air cool kit 50cc Compatible with Scooter 139QMB 49cc 50cc Engine 50mm Cylinder Block 90cc Boosts HP & Speed 5-10mph with 6 Pin Racing CDI Ignition Coil

4.8 (2) Write Review
Free shipping on orders over $29.99

$62.88

$ 26 .99 $26.99

In Stock
  • Compatible with scooters 139QMB and 49cc and 50cc GY6 engines
  • Design for upgrading from 50cc
  • Note: To ensure you are ordering the correct belt for your machine. Please reference your OEM part number listed in your user's manual or the OEM sticker on your machine.
  • The kit was air cool kit. Please check and make sure this fit for your car before ordering.


Compatible with scooters 139QMB and 49cc and 50cc GY6 engines


Donald Cuthbertson
Reviewed in the United States on February 7, 2025
I just got this kit upon opening it this isn't it 100cc kit but a 50 don't buy it
robert spear
Reviewed in the United States on November 10, 2024
it said it is a big bore kit 100cc nothing in kit is 100cc. Everything is 39mm /49-50cc so for me was useless
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