Decompression Valve, Vortex DDS / DDJ / DVS / DJT / DST / VTJ / VTS / VTN

The decompression valve for Vortex Engines is one of the new features of the non-gear engines since the KF engines. For OKJ and OK engines from Vortex, the decompression valve is used as a sort of starter for the engines as you pull the tab up when pushing the driver onto the track. What happens is when you pull the tap up you will enable the compression of the engine and it will start. On the kart trolley, the rear wheel will be very hard to turn around when the tap is up but it decompresses when you press it down in order for you to put kart chain lube on and check sprockets, etc. 
This is made for Vortex engines in OKJ, OK, OK-N Rok DVS. 

Original Vortex spare part.