Mercury 90 hp problems...need help

[triton75]

Hi all, i bought a 2005 triton with a 90 hp 2-stroke mercury on it. i am starting to see a problem when the motor is cold, it acts really cold natured for some reason. When i get out of the no wake zone, i have to really ease into the throttle because if i just nail it, the motor stumbles pretty bad.....I put new gas in it, higher octane the other day and i always add fuel stabilizer so it doesn't gunk up....I have not changed the plugs though, don't know if that would help or not......Any suggestions? Thanks for any advice....BJ

 

[Chris1956]

Re: Mercury 90 hp problems...need help

If the motor is at normal operating temp. (140*), than that is a symptom of dirty carbs or incorrect idle adjustment. You can try to richen the carbs 1.8 turn CCW, and see if that helps. If not, a carb cleaning and rebuild is in order.

If the motor doesn't warm up, check/replace the thermostat

 

[triton75]

Re: Mercury 90 hp problems...need help

this motor is a 2005 model. Does it have carburator or is it fuel injected? I'm not sure, i just popped the plugs out and plan to replace 'em first thing tomorrow. But, i didn't look to see if it's injected or not........

 

[sdudley]

Re: Mercury 90 hp problems...need help

I too have a triton, sp175 with a 90 merc 2005. I had a similar problem. I changed the fuel filter, and rebuilt the fuel pump with parts located here on iboats. If you jump down on mine, it will try to throw you out the boat... I use seafoam in my gas. If you rebuild fuel pump, it's cheap and fuel filter is cheap, use OEM for fuel pump rebuild.... Hope this works for you.