NCY PERFORMANCE CYLINDER HEAD ASSEMBLY 50MM 81CC KIT 49 50CC QMB SCOOTER MOPED

Description

NCY GY6 50/QMB139 50mm Cast Iron Cylinder Kit w/o head
Want a real screamer? Then this 88cc big bore kit for you, although its not a bolt on item for most QMB 139 bikes. Most of the time, engine cases must be cut. Order part number, Engine Bore Tool if there is no access to a machine shop. Its also recommended to get part number, 50mm big valve head as well, as some stock heads will not fit.
Have a look at our Decompression Tube Assembly which replaces your dipstick and allows excess crank case pressure to be released. Good idea to install one of these alongside any cylinder kit upgrade.
NCY 81cc Aluminum Performance Cylinder Head.
Great quality alloy cylinder head designed to work seamlessly with  81CC cylinder kit. Give your 139QMB the power to handle today's city traffic.
You can use this cylinder on all 139QMB engines from SYM, Kymco, QLink, Filly 50 as well as other Chinese scooters with the 139QMB engine.
Note:Rocker arm assembly may be required for some models. Please check the valve stem height as it relates to the rocker arms installation.
Be sure to add
an exhaust
, upgrade your
carburetor
and
air filter
for a complete upgrade.
Not legal for use in California on pollution controlled vehicles. Check local laws before installing.