Merc bogs on accel then fixes itself

S

schmoedog

Seaman Apprentice
Joined
May 22, 2002
Messages
39
I have a newly rebuilt 1979 Merc 115. It starts fine,it idles pretty good (I haven't fine tuned it all yet) but on acceleration it starts to bog down at about 1/4 throttle for a couple of minutes then fixes itself then it runs fine at all speeds until I stop again. Since the power head is new I have been running double oil. I'm on my second tank of normal mix and it still does it. Any thoughts? Fule starvation or timing? Also I'm not getting the high end I expected. I'm running it on a 16 foot Wellcraft trihull and topping out at about 38 mph. I have a 19 stainless prop. Thanks :confused:
 
Bob_VT

Bob_VT

Moderator & Unofficial iBoats Historian
Staff member
Joined
May 19, 2001
Messages
26,022
Re: Merc bogs on accel then fixes itself

How are you getting to 1/4 throttle? You should hammer the throttle down to the plane and back down to it. It sounds as if you might have to clean the carbs too. Bogging down might be too much gas and your flooding it out.<br /><br />Bob
 
W

wet dog

Seaman
Joined
Jun 26, 2002
Messages
50
Re: Merc bogs on accel then fixes itself

I had that same problem after rebuild. too much oil, had to clean the carbs really good.
 
G

Gold Bear

Petty Officer 1st Class
Joined
Sep 26, 2001
Messages
224
Re: Merc bogs on accel then fixes itself

Schmoedog,<br /><br />See if your idle circuit is lean. That can cause the problem you are describing. Turn your idle screws out 1/4 turn and see if that helps (test in the water). If not, try another 1/4 turn. If there is still no change put the setting back to original.<br /><br />Good Luck, Gold Bear ;)
 
S

schmoedog

Seaman Apprentice
Joined
May 22, 2002
Messages
39
Re: Merc bogs on accel then fixes itself

Thanks ya'll. Goldbear wins. My mechanic told me the same thing. Now it runs like a new one
 
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