Re: 9.5 yamaha 4 stroke too fast
9.5 or 9.9?<br /><br />Have you looked into a prop with a smaller pitch? I've seen some small Yamaha props with huge round blades like an old electric fan. Props that come on those are generally for pushing rowboats. Yours is a special application and you should get an appropriate prop for it.<br /><br />You can also try lowering the idle speed. It adjusts with a screw like most other types of carburetors. You can get those to idle as low as 500rpm or so. (It'll go lower, but the fuel pump needs at least 500rpm to draw fuel.)