2004 Yamaha 150 four stroke high idle problem

[Bronzer]

I just bought a bass boat with a 2004 Yamaha 150 four stroke outboard. It idles around 1200-1300 rpm, and it grinds when I put it in gear. Even once in gear, it idles at the 1200-1300 level. The previous owner says it has been that way the whole time he has owned it. I know it should be around 750 rpm at idle. Is this something that I can adjust or am I going to have to take it to a mechanic?

 

[99yam40]

need to take to a Yamaha shop with a Yamaha master tech if you do not have the knowledge and tools to find the problem.
Something is broke or disconnected

also I would think the lower clutch dogs and gears are not in very good shape if he has been running this thing like that for 12 years

 

[wrench 3]

Check the throttle linkage to make sure that it's returning all the way to the idle position. Also check for vacuum leaks (a hose off etc.)