Yes you can put a regular check valve in place of the other one on the injector nozzle. I have installed then in the injector line going to the head...but this is a tough place as the check valve will get beat up. I suggest putting in between the pump and carb. I currently have a 160 with this setup in it. It works great.

If the plastic one rotates easily its probably leaking. When a new one is installed it will not move hardly at all. Very tight. Try running without it and you will see there is not much difference. Its very subtle.


Troy Newman
Team YS