1998 Yamaha 25hp outboard four stoke:<br />The engine will barely idle and dies when it is throttled. Seems like it is running lean.<br />I can get it to rev by placing my hand over the air intake and resticting the air to a minimum.<br />Fuel pump is good. Carb is clean. Drained gas and put new in. New primer bulb. Can anyone give me some ideas?
<br /><br />"Carb is clean." is too pat. How do you know this? Same question about the "good" fuel pump?<br /><br />All of your symptoms are of fuel starvation, or "running lean".<br /><br />If choking it gets it to run something is preventing the carb from supplying the correct amount of fuel.<br /><br />Is the bowl full on the carb? If so it is clogged jets. If not, look for restricted fuel flow from the tank vent to the carb, air leaks in the lines, failing fuel pump, stuck float needle in the carb.<br /><br />Good luck, and let us know what you find.