I'm not a "tree-hugger" but these emission valves come on everything from 50cc-250cc engines.I've removed them off all the ones I've had. I was curiuos as well and it's a one-way valve like a pvc valve that the older motors had. My assumption is that it is to trap fuel vapor and attempt to burn it before exiting the tail pipe.All the engines ran better with higher rpm's after removal.
|