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CLEO GY6 50cc-100cc Cylinder Head Kit Assy 50mm Big Bore with 69mm Valves for 139QMA 139QMB Engine Scooter Moped ATV Go Kart Quad

4.6 (5) Write Review
Free shipping on orders over $29.99

$55.78

$ 26 .99 $26.99

In Stock
  • Fit GY6 50cc-100cc 69mm 4 Strokes 139QMB or 139QMI engines Scooter
  • Cylinder Head:Intake Valve OD 18mm;Exhaust Valve OD 16mm; Head Assembly with 69mm
  • Valves 100cc Cylinder Diameter: 50mm Wrist Pin OD: 12.77mm
  • 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.


Michael Farmer
2025-06-30 16:06:23
Very satisfied with the seller even sent parts not listed would highly recommend
Package came in and I was missing a piston ring
2025-02-04 11:23:11
Open the package and seen I was missing a piston ring
Laura Ann Coffey
2024-12-16 15:49:36
Fast shipping. Item as described
Patrick M.
2024-12-02 14:11:32
I bought one of these and installed it on my 2015 ice bear maddog that has extra long case transmission, I put a 125cc carburetor on it with high performance clutches and my maddog is doing 60 mph worked great for me no problems! 👍
Fain
2024-11-28 15:17:13
Big bore kit was supposed to have gaskets with it