Hi, all. I'm having an issue with my Mercruiser 120 carb and a high idle. It is a 1984. I don't have the serial number with me at work. Sorry - I can post it later. I've done a few searches and haven't really found my exact issue. At start up, the boat will idle at 8-900 RPM. If I put the boat in gear or rev the engine out of gear, the idle will not return back to it's normal 8-900 position. It runs at about 11-1300 RPM. I can push the linkage on the carb to make it return to normal, but it will not do it on it's own. When pushing the linkage, there is no resistance and it is easy to do - not forcing anything. The return set screw on the stop at the low idle, but not at the higher idle until I push it down. This happens when the engine is warm and cold, so I don't think it is a choke issue. This also causes the engagement of the gears to be harsh and a decent "clunk". Almost like the engine interrupter switch (or what ever it's called) isn't working correctly. It will cut the engine in manually pressed. I have tried to adjust the shift linkages, I know the distributor is clean and functioning properly. It runs good and is timed correctly. I'm at a loss. I was thinking or adding some sort of return spring, but I know that doesn't really solve the actual problem, but may get me the desired results. Thank you and help is appreciated.
