9.9 - won't idle after carb overhaul

[jb5]

I'm a newbie member, but I've gotten some great tips from the forum already.<br /><br />I have a problem that I brought on myself... I overhauled the carb on my 1987 9.9 merc (it wasn't running too well last season - stalled and hard to start)and apparently got something wrong. (next time I'll follow my instincts and take it in for the work).<br /><br />The engine starts and runs great in neutral at higher speeds (with the manual throttle open), but as soon as I try to bring it to normal idle speed, it dies out.<br /><br />I assume I got something wrong when I reassembled the carb (the shop manual wasn't all that helpful). I know that I got the lower hose connected ok, the fuel supply and ignition are good. It seems like maybe a fuel mixture problem in the low speed circuit.<br /><br />I'm wondering if anyone else has seem a problem like this or could direct me on where to look for my mistake.<br /><br />Thanks for your help,<br />jb

 

[fishingdan]

Re: 9.9 - won't idle after carb overhaul

Did you remove the idle mixture screw and clean out any junk? Did you replace the idle mixture screw? <br /><br />Have you set the idle mixture screw per the manual?

 

[jb5]

Re: 9.9 - won't idle after carb overhaul

I took out the idle mixture screw and blew air through the jet. I reset the screw to specs in the manual and have tried re-adjusting since I put it on the boat.

 

[Jack Lake]

Re: 9.9 - won't idle after carb overhaul

JB, Have you got yours fixed yet? I had the same problem, rebuilt the carb, changed nothing. It's in the shop getting fixed now, but I noticed somebody posted the same problem last year, but didn't post what the solution was...

 

[Jack Lake]

Re: 9.9 - won't idle after carb overhaul

For anyone having the same problem:<br />Mine is fixed now, the spring and ball in the primer assembly were jammed, allowing too much fuel into the carb, that's why it would only run with the throttle plate open. Runs like a dream now!