90 HP Mercury idling issues...

[BoneDigger]

This is a 2000 model 2-stroke "classic" design. It does well at idling speed when I am trolling, but when the boat is in neutral, it will run great for a short time, sputter, then shut off. It cranks right back up, runs fine for a minute or two in neutral, sputters and dies. Cranks right back up... It will troll at 2.5 mph all day without a hitch. Any ideas?<br /><br />Todd

 

[steam_mill]

Re: 90 HP Mercury idling issues...

I've got the same engine. The same thing happens to me when I first start it up if I have not either pumped the bulb at least 10 times or not have moved the idle lever (?) far enough.<br /><br />When warm, it will not stall. I suspect your idle may be too low. What are you idling at?<br /><br />Joe

 

[Wellcraft 89]

Re: 90 HP Mercury idling issues...

Are you having any high rpm surging at all ?<br />chk fuel vents chk your air mixture screws,mine had the middle one ,not the same as the bottom and top from the factory <br />ran okay first couple times out when new ,but started to stall the same as yours.adjusted runs fine now.<br />fuel pump could be starting to act up <br />also carbs could be dirty or gummy<br />what do the plugs look like? all the same or one different?<br /><br />Rich