Motor bogs until I tap the choke button....

[bsutravis]

I'm dealing with a '77 Mercury 1150 / 115HP - Ser. Num 4569747

This past weekend my old Tower of Power developed a situation where it would seem to flood and die when I attempted to throttle up beyond idle. I could get up to about 1200 RPM, and then as I continued to push down it would just bog down and die unless I pulled back to idle. I didn't do it everytime, but I'd guess 75% of the time when I went to give it the gas it would do this. What I did discover though, was if I would give the choke button a tap while I was adding throttle the motor would give a hiccup, and then it would go ahead and let the RPM's to increase like normal to the point I could get to WOT with no issues. Sometimes I'd have to hit the choke a couple times though the RPM increase, but it would work to get me up to plane and eventually WOT.

Does this sound like a sticking carb float? I pulled the plugs and nothing was fouled.... I'm looking for possible areas to look towards to get my old merc back to the point that I can do a normal hole shot with no hesitation or bogging down and dying.

Thanks for the help............

 

[Chris1956]

Re: Motor bogs until I tap the choke button....

You have too lean of an idle mixture. Likely due to dirty idle passages it the carbs, since it just started. Sounds like a through cleaning and rebuild is in your future.

 

[93chevy]

Re: Motor bogs until I tap the choke button....

Use sea foam in your gas tank. My 92 115 was doing the same thing. After running for about three days off and on the problem has almost disappeared. This is some good stuff!