Originally Posted by mcollinstn

The throttle arm controls both the intake butterflies AND the timing plate under the flywheel. There are separate adjuster screws for both of them. Even a low butterfly openings, the timing advance alone will make those motors rev when there's no load on them.

Pull the cover. Disconnect the throttle cable from the big arm. Make sure it all moves as it is supposed to from idle position to wide open throttle position. Hold the arm and let somebody fire it up. See if you can move the arm far enough to let the motor idle down to under 800. Vacuum leaks can also contribute, but chances are that you have something out of adjustment from the throttle cable itself to something in the arm and actuators.

There are stop screws for max timing advance, minimum throttle plate opening, etc. Just take a look while you move the arm and watch it all. It will make sense.

You'll notice that the throttle plates only open a tiny amount as you increase the throttle until you get most of the timing in, then the throttle plates start opening.

MC

Originally Posted by vegaskeith

Thanks MC! I did mess with the timing arm and got it to slow down a bit. I need to put it in the water and bring a buddy with to run the throttle. I'll let you guys know if I get it running better!