I am guessing that by now you have this fixed, but I had the same problem and figured I would update this post with how to fix it.
How to Fix:
If you remove the Neutral switch from the throttle, there is an 11/16" bolt that holds the throttle arm on. This bolt simply came loose. However, when I tightened it back up, the throttle arm would barely move. This was because the mechanism that the throttle arm attaches to (and moves) was positioned to where the boat was in gear. In order to put the arm back on properly, that mechanism needs to be rotated until the boat is in neutral. You can tell the boat is in neutral when the prop can be spun in both directions. Once I got it to the neutral position, I reattached the throttle arm back into the mechanism with it positioned straight up and it started acting correctly. It moved freely and it went into forward, reverse, and neutral. I have had it out a few times since the fix and it is working great!
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2001 Four Winns 180 Horizon
4.3L Volvo Penta
