Crankcase breather set NARAKU silver 139QMB/QMA GY6 50, GY6 125- 180cc 4-stroke

Crankcase breather system by Naraku. A simple yet effective design by Naraku, suitable for all 139QMB/QMA (GY6 50) Kymco and GY6 125–180cc 4-stroke engines. The kit replaces the factory-fitted oil filler plug/dipstick and is positioned vertically or upward and secured beneath the bodywork with the supplied cable ties.
Why a crankcase breather?
As the piston moves downward, pressure builds up in the crankcase, reducing power because the piston’s work is not transmitted exclusively to the crankshaft but also has to overcome the back pressure in the crankcase. With sufficiently large ventilation, the engine revs more freely and can transfer more power to the road.
The same effect becomes negative during the piston’s upward movement: this creates negative pressure, which is also balanced through the vent.
Of course, all engines already have a factory crankcase breather, but it is quite small and not really suitable for modified and more powerful engines.