Home › Forum › Ask A Member › A tale of two magnetos › Re: A tale of two magnetos
If you look in from the front of the carb with your head low you should see a boss on the crankcase. When the hash mark in the throttle cam lines up with that hash mark the throttle butterfly should just begin to open. There are adjustments in the linkages or maybe adjustment made by loosening the bolts that hold the throttle cam in place, depending on year and model. My understanding and my experience leads me to believe this is a rough setting and a little one way or the other may result in superior performance. What you are really doing is determining where on the spark advance curve the high speed jet starts coming into play adding it’s input to the low speed jet.