Cart 0

Head 50mm QMB139 Big Bore Head with 64mm Length Valves GY6 49cc > Part # 169GRS70-64

  • $ 5999

Grand Rapids Scooter's 50cc QMB139 4-stroke 50mm, Big Bore cylinder head.

Please note: replaces Cylinder Heads with 64mm Valves (Short Valve Style). Goes with Part #151GRS258 or 169GRS54 for use of 64mm Valve Set Up.

Supported Models: Bintelli, Tao Tao, Peace Sports, Wolf, Schwinn, Puma, SYM, Alliance, Motorino and Kymco.


  • Intake Valve Diameter: 21.5mm
  • Intake Port Diameter: 24mm
  • Exhaust Valve Diameter: 18.9mm
  • Exhaust Port Diameter: 22mm
  • Valve Length: 64mm (compatible with 64mm Short Valve Style Heads) 
  • Does not come with camshaft, please see Related Items


We Also Recommend