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  1. M

    2007 Mercury 25 EFI Possible Power Loss?

    Hey everyone. It's been taking a while for my J16 to hop on plane lately. I went down and pitch and only lost top end, not gaining any holeshot. Motor doesn't seem to have as much umph as when I first got it (could be in my head). I'm not sure on the RPMs, tach is on order. Idles good and...
  2. M

    Electrical Question/Issue

    I noticed the other day that my exhaust housing had some ground wires (well I'm guessing that's what they were) that had rusted off. Here's a pic: I attempted to reconnect them with some new wire and it seemed to work but, after driving home today, I noticed one came off again because I...
  3. M

    Bent Prop Shaft on 25 EFI

    The prop shaft on my '07 Mercury 25 EFI is very slightly bent. So slight that even a reputable repair shop in the area didn't even catch it on a test ride and removal of the lower unit. However, we did notice it the next time I took it in when we hand spun the prop. It's very slight and...
  4. M

    2007 Mercury 25 EFI Gear Oil From Water Intake

    I just noticed today that I have a little gear oil dripping from the water intake of the lower unit. I've only run it once since it was in the shop and they pulled the lower unit for the water pump. It's not a heavy drip or anything. It's VERY slight and after the last 8 hours hasn't even...
  5. M

    Procedure for 25 EFI Impeller Replacement

    Can someone give me a detailed procedure on replacing the impeller on my 2007 25 EFI? I need to get it done before the weekend and can't afford to buy a shop manual at the moment. I've always done all of my outboard work but it was always on a 2 stroke...a little weary about diving into the...
  6. M

    2007 Mercury 25 EFI Shop Manual

    I'm looking for a downloadable shop manual for my "new to me" motor. Can't really afford the hard copy right now so I would REALLY appreciate any help with getting a hold of one. I found one for my old '98 Merc 25 2 stroke but can't seem to find one for the EFI. Thanks!!
  7. M

    2006 Mercury 25 EFI Whining Noise

    When running on the hose, and even in the water at low speed, the motor runs quiet and smooth. But once the RPM pick up and approach WOT, it starts to have a whining noise and won't get up to speed. Feels almost as if it's slipping somewhat...but not a prop slip. The motor has <20 hours of...
  8. M

    Plug Wire Shock

    I have a 1998 Mercury 25 hp 2 stroke and it has been idling rough for quite a while. Top end seems okay. When running some fresh fuel through it on the hose today I decided to investigate. Pulled out the bottom plug wire and the motor shut off. Put it back on, restarted, and went to pull the...
  9. M

    New Thermostat Opening and Staying Open

    I just replaced all of the gaskets on my '98 Mercury 25 2 stroke, did a complete water pump job, and replaced the thermostat. In the process, I removed some corrosion from the powerhead at the thermostat housing bolt holes. I had to used a gasket maker in conjunction with the dry gasket to...
  10. M

    Driveshaft Oil Seal With Pic

    I haven't had a chance to check the LU oil for water intrusion yet but does this look as if it needs replacing? The brass sleeve looks pretty corroded but is basically irreplaceable since no parts places carry them anymore. Should I look at getting a different sleeve and replacing the seals...
  11. M

    1998 Mercury 25 2-Stroke Overheating

    My opinion was the water pump and thermostat job was botched but I want to explore other options. It seems to pump less water when up on plane and the motor is properly mounted. I am in the process of re-doing what the crap mechanic messed up...one thing being replacing the 143 degree...
  12. M

    It's HOT!!!

    My motor pees good and the tell tale is luke-warm when idling. After a cruise, the pee stream is steaming hot. I can't put my hand under it. The block is pretty hot, too. I also noticed that after the run the exhaust relief had a lot of smoke coming out of it. But after a couple of seconds...
  13. M

    Leak Around Spark Plugs?

    I have a strange leak around both of my spark plugs. It's been there for a while but I'm just trying to finish working out my kinks to get this motor to new condition...it needs to last a while. I never noticed it before I had my water pump and thermo done in which they replaced the water...
  14. M

    Causes of Mid-Section Squeals/Squeaks?

    I've made numerous posts and no-one has helped me yet. :( I hate to clutter the forum but I know it has a good reputation of having numerous very knowledgeable people. Anyway I have a squeak/squeal that occurs when I come off WOT runs and lasts for a while until dwindling away. It sounds as...
  15. M

    1998 Mercury 25 Squeaky

    I've been hearing a squeaky noise coming from the exhaust housing after the motor reaches operating temperature. Motor runs great and pees great (although the pee gets pretty hot...not unbearable to touch but close). Just had a complete water pump job done, too. But the issue existed prior to...
  16. M

    1998 Mercury 25 Issue

    A little update...I ran the boat today at a lake and I noticed 2 things: 1) It was pissing sh*tty (again...right after a COMPLETE water pump job) and the pee stream was lava hot 2) It was still squeaking after a WOT run I headed back in making sure the motor wasn't overheating, which it...
  17. M

    1998 Mercury 25 2-Stroke Shift Linkage Adjustment

    My motor shifts fine in and out of forward but only shift into reverse when it wants to (while the motor's running of course). I decreased the idle RPM and it help a little but it's definitely at a very low idle right now. Only other thing I could think of is shift linkage needs adjusting...
  18. M

    1998 Mercury 25 2-Stroke Squeak

    I have narrowed down the squeak issue to some sort of air/fuel mixture coming off WOT. The reason being as I didn't notice it while I was running WOT (maybe I just couldn't hear it) but when I got back down to 1/2 throttle I did notice it. I decreased RPM to idle and went to give it more gas...
  19. M

    1998 Mercury 25 Chirp

    My motor runs great but has a chirp/squeak noise after I run WOT/full throttle. I can cruise around all day and it's fine, no noise. But If I run at high RPM or WOT, it does it. Any thoughts?
  20. M

    1998 Mercury 25 tiller revving while shifting into neutral when approaching boat ramp

    I've had this problem twice now. The motor runs great all day and shifts good all day. But when I shift into neutral approaching the boat ramp (coincidence?) it revs (don't think it was still in gear but sounds like it is flirting between neutral and forward...was too busy panicking and trying...
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