'90 15hp merc. cold start issue

[swfl mike]

I posted about this before I rebuilt my carb. and was originally pointed in the direction that I need to have the motor lync 'n sync'd. I just want to get a second opinion before paying a tech because money is tight right now.

Before I rebuilt the carb it wouldn't stay running, it would make a puff out of the exhaust and die. Now that I cleaned it and put in new gaskets/needle it runs like a dream when it's warm... but, when starting it cold, it still makes the puff noise and almost stalls out and does this for a minute or two until it's warm.

If it's a timing issue I'm going to have to pay to have it done. But, could it be something more simple like plug gap, or plug wires? Wires appear to be fine. I bought new plugs and the guy at the merc. shop said they were pre-gapped. Anyone know what they're supposed to be gapped at? BR8HS 10.

 

[swfl mike]

Re: '90 15hp merc. cold start issue

Anyone have this happen before???

 

[bryanwess2000]

Re: '90 15hp merc. cold start issue

Is the idle mixture screw turned 1 1/4-1 1/2 turns out from seated.
I only ask because I bought a 8hp mariner and the guy got it running
after 2 pulls but when I tried to start it 2 wks later, no go. After I wore
my arm out pull starting it I checked the idle mix screw and it was set at 3/4
turns out. Its started on 2-3 pulls ever since I adjusted it.

 

[swfl mike]

Re: '90 15hp merc. cold start issue

I'm not sure specifically where it's at right now I just backed it off of being fully closed by a few turns. I'll set it to that setting and give it a shot tonight. Thanks for the response

 

[crem1]

Re: '90 15hp merc. cold start issue

Did you check out your fuel pump?

 

[swfl mike]

Re: '90 15hp merc. cold start issue

Yeah the fuel pump is attached to the carb. and the rebuild kit came with the carb. rebuild, so it's in new condition.