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2007 25 hp Mercury will not run at wide open throttle

merciervic

New member
I have a issue with my little 25 Merc, it’s a 2007 tiller manual choke 2 cylinder single carb model. The motor runs great a low speed but when you try to run WOT it bogs down. I have had the carb cleaned at my local marc dealer, changed the fuel line, cleaned the tank, changed the plugs, and changed the water pump, all of these things helped a little (maybe it sure starts easier) but it still will not pull WOT. I have checked the compression 116 lbs on both cylinders. I’m stumped any one have any sugestions?
Thanks
Vic
 
Re: 25 Mercury will not run at wide open throttle

Vic,

I had a similar problem with my 25HP Merc, although it is a 1995 w/remote steering. It turned out the fuel tank vent was clogged and whenever I tried to run WOT, the carbs were not getting enough fuel. I replaced the old tank (it was pretty shabby anyway) and it fixed the problem.

Dave
 
Re: 25 Mercury will not run at wide open throttle

I have the exact opposite problem with my 25 Mariner. It runs fantastic at full throttle but wants to die at low speed and idle. If I hold the choke out it will idle, but even when it's warmed up when I push the choke in it won't idle. Isn'y there an idle screw I can adjust to turn the idle up a little bit? If so where is it?
 
Re: 25 Mercury will not run at wide open throttle

Ohnomark, sounds like your slow jet is stopped up. Clean and rebuild the carbs, and you should be good to go.
 
Re: 25 Mercury will not run at wide open throttle

Try backing out the idle mixture screw 1/4 turn at a time and see if that helps.

Jeff
 
Re: 25 Mercury will not run at wide open throttle

I have the exact opposite problem with my 25 Mariner. It runs fantastic at full throttle but wants to die at low speed and idle. If I hold the choke out it will idle, but even when it's warmed up when I push the choke in it won't idle. Isn'y there an idle screw I can adjust to turn the idle up a little bit? If so where is it?


Me too, was gonna ask that question but saw this 1st. Mine may or may not idle, but, it's real low.Can I add about 100 rpms? Thanks Dickey
 
Re: 25 Mercury will not run at wide open throttle

Had that problem with my 1985 model & it was a small crack in pickup tube in the fuel tank it finally got big enough that it would just die & I found it??? Hope this helps
Can someone tell me what the timing is suppose to be set on??? THANKS
 
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