Hello, I´m Keith from alabama. I have ridden bikes on and off all my life and am always looking for something else to play on. I just recently bought a 1981 yamaha dt 175 2 stroke. It is in pretty ruff shape. I,m just trying to get it going to have a little fun on. My question is about the power valve. It is operated by the throttle cable, I have got it losend up, but the two vacum hookups from the powervalve that come out the top of the engine case that are not hooked up. Can anyone tell me were they go and how it is suppose to operate? I am not familiar to much with this.