Shopping Cart

Your cart is empty.

Your cart is empty.

CLEO GY6 50cc-100cc Cylinder Head Kit Assy 50mm Big Bore with 64mm Valves for 139QMA 139QMB Engine Scooter Moped ATV Go Kart Quad

5.0 (6) Write Review
Free shipping on orders over $29.99

$55.78

$ 27 .99 $27.99

In Stock
  • Fit GY6 50cc-100cc 64mm 4 Strokes 139QMB or 139QMI engines Scooter
  • Cylinder Head:Intake Valve OD 18mm;Exhaust Valve OD 16mm;
  • Head Assembly with 64mm Valves 100cc Cylinder Diameter: 50mm
  • Fit Models:For scooters with 139QMB or 139QMI engines Scooter
  • Before ordering check your head assembly for the correct valve length.


AH is specialized in providing parts and accessories for Off-Road Motorcycles, Karting, ATV and Scooters/E-Scooters

We are your one-stop-shopping choice from replacement parts to Plastic Body Fender Kit accessories. Always ready to meet the end of Motorcycle & Powersports Lovers.

  • We supply parts to support ranges of models and constantly update the catalogue to fit the latest product.
  • We offer unconditional services for our product and are ready to provide you with the best pre-sale/after-sale service.

A big part of the story between us would begin with a small part.


Escadrone
Reviewed in Canada on March 5, 2025
Piston trop petit et ring trop grand la qualité est désastreuse je déconseille
m.matrix
Reviewed in the United States on August 10, 2024
Installed all the parts without issues
Janssen
Reviewed in the United States on April 17, 2023
Now I can do 55 to 60 mph easy.
Eric Harris
Reviewed in the United States on August 22, 2022
This is a good kit to use to upgrade from stock 139qmb motor for a little bit more speed and performance out of your Chinese Scooter.
MP3
Reviewed in the United States on November 9, 2022
Purchased a kit from CLEO at $56. I give Amazon and CLEO 2 stars for ease of purchase and quick shipping and delivery with it being well packaged and all parts included. My past purchases have been on point, five star experience, no faults with the product. This time is two star review due to faulty product and is two star because of past experience or otherwise it would be a 1 star. This time quality assurance missed this fault. CLEO needs to inspect their inventory for more faulty product like this that came from their machine shop. The head, just below the valve cover, it has a hole that goes through the wall of the head. Once the engine is in operation the oil begins to leak out, spraying all over. Pictures or video option was not available. The Amazon app kept saying something went wrong on their end. Wanted to include pictures pointing out the fault for Amazon, CLEO, and future customers to view and see how easy it is to miss on inspection. And buying new, you just don’t expect it anyway. Nevertheless, it was a quick fix. Drilled the hole slightly bigger and sealed it with high temperature sealant and its good to go. The inconvenience was there but decided to fix it myself because shipping back the parts and waiting for new parts to arrive it would have been another week or two, making it a much bigger inconvenience. Anyway, stay vigilant and safe while riding and keep upgrading your machines. They are very fun to ride.Its been a couple of weeks and now able to load photos. Take a look and see the hole in housing of head.
Jeff ambourn
Reviewed in the United States on November 19, 2022
Product appears to be of good quality but missing base and head gaskets. The kit is incomplete