I'm rebuilding a 90 model 100hp inline 4. I am happy so far with how things have gone, but I am scared about one thing. The size of the holes on the brass fittings that feed the bottom 2 cylinders when the engine is at low rpm's. They are so tiny, and I am not sure how they work. The do have a one way needle type valve inside, but they have me confused. Can anyone shed any light on how exactly they work?<br /><br />kev
