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  1. LaqueRatt

    Merc 75 4 cylinders, 2 carbs

    Messed with that plastic clip, never actually got it loose. Also tugged on cables a bit. Then was able to idle it down, but something seems sticky. The idle is floating around. Also think may have killed my impeller. Those stupid muffs fell off and I didn't notice right away. Geez, I just can't...
  2. LaqueRatt

    Quick Question for Merc Experts

    Guess I'm attending the school of hard knocks here. I'm learning, but it's proving to be a steep curve Haven't been revving the hell out of it really, but have been giving it some brief bursts just to see if it is accelerating without bogging. I'm kind of lost now, but guess will not mess with...
  3. LaqueRatt

    impeller. 82 50 hp 4 cyl

    I'll admit haven't tried an actual Merc dealer, but I gotta wonder when R1 last checked prices on these. Think maybe I'm looking for the same part for my '85 75 HP Merc and I'm seeing the same thing. Some Merc impellers are over a hundred bucks. Sierras seem to be more like $25-30.
  4. LaqueRatt

    Quick Question for Merc Experts

    Got after it yesterday, but all I managed to do was get the idle to drop down, but it many times idles high and then drops down. Weird. All I did was pry around on the cables trying to figure out how to release them to adj. Now I think they are OK, but maybe need lube or something? Oddly didn't...
  5. LaqueRatt

    Quick Question for Merc Experts

    Good to know. It's 50 out with a stiff N breeze, not feeling much like getting wet, but it needs to be done. Hopefully it'll warm up.
  6. LaqueRatt

    Quick Question for Merc Experts

    Thank you Chris. The amount of misinformation online is amazing! So I'm obviously too lean I think. Could this cause a high idle speed?
  7. LaqueRatt

    Quick Question for Merc Experts

    Do the idle adjustment screws work normally on in line 4s (mine is a 75 HP) or are they backwards? I read somewhere that you tighten them, clockwise to richen the mix instead of turning CCW like most carbs. I'm thinking this is wrong as I watched a vid on adj the carbs and the guy was doing it...
  8. LaqueRatt

    Merc 75 4 cylinders, 2 carbs

    Thank you sir, I'll see if can figure out how to do that. The cable just pops off and then it spins I reckon?
  9. LaqueRatt

    Merc 75 4 cylinders, 2 carbs

    BTW, I checked the compression on this motor the other day and got 150 across the board! Kinda shocked actually. Not complaining, just never saw figures this high on any of the small OMCs I've messed with.
  10. LaqueRatt

    Merc 75 4 cylinders, 2 carbs

    Well the winds really kicked up with the temps, so the launch got aborted. Current issue is the idle is too high and the idle stop doesn't seem to be the problem. I'm thinking the cables are. Anybody know how to adjust them? I see a bunch of threads showing so they must be adjustable. I didn't...
  11. LaqueRatt

    Merc 75 4 cylinders, 2 carbs

    Got the carbs off, cleaned, and reinstalled yesterday. Running much better. Starts easy, doesn't die. Idles a bit high though. I found the idle stop, but that didn't seem to drop the idle very much. I see where it looks like the cables are adjustable. Not sure want to mess with that or not. Not...
  12. LaqueRatt

    Merc 75 4 cylinders, 2 carbs

    Thanks for all the helpful info. Never thought about trying the library. I'm definitely going to check into that. A manual would be nice, but I can't seem to dig up anything that I'm sure is the correct one. Seems most cover a range of engines, kinda like the old Chilton manuals for cars I'm...
  13. LaqueRatt

    Merc 75 4 cylinders, 2 carbs

    I actually turned this one up, pretty much all I can find. Wish it showed how to pull them. Guess I can figure it out. Be nice to have a manual, but not even sure if that's an option. Ones I've looked at seem to be for newer motors or cover a bunch of sizes which may not be of much use? Sure...
  14. LaqueRatt

    Merc 75 4 cylinders, 2 carbs

    Just bought a boat with this motor on it. Been sitting for a few months. Got it running and it seems like a strong runner. All cylinders are pretty even @150 lbs. Issue is it dies when I throttle it down. Actually is seems to idle halfway decent with the stick forward a bit, but not when the...
  15. LaqueRatt

    25HP Idles Low in Neutral

    Thanks, that's a good read. Now pretty sure am on a wild goose chase and no adjustment exists. Maybe it's time to go back in the barrel to see if tweaking the low speed setting may help some. Does anyone think it's normal to not be able to rev it up in N? I know it's limited, but limited to...
  16. LaqueRatt

    25HP Idles Low in Neutral

    Both the same, either 130 or 135. Think 135. Motor appears to not have seen much use, but it's passed through the hands of a couple knuckleheads, not including the present owner (me). So from what I'm hearing should I assume there is no adj for high rpm limit in neutral? I sure can't seem to...
  17. LaqueRatt

    25HP Idles Low in Neutral

    OK, thanks. I learned something today. I won't mess with that screw. Any ideas why this motor barely accelerates in neutral? Thing is I start it with nearly as much throttle as I can and then it idles at like 500 and turning the handle may get me up to 700 or so. Which is too low for when it's...
  18. LaqueRatt

    25HP Idles Low in Neutral

    Could it be something with the tiller? Like maybe it's not installed properly? The pointer does not seem to be where it should be. Either in N or in F. The first 3 show the limits on the handle. Both fast and slow. Plus the position on the stop. The last 3 show it in Forward gear.
  19. LaqueRatt

    25HP Idles Low in Neutral

    Yes, motor works quite well actually. Looking at what you circled, are you referring to that screw? I don't see anything rubber, maybe it's missing, but I'm hesitant to move the screw as it doesn't seem like it would have any affect on that cam. Or the tab that rides on it. I'm temped to try to...
  20. LaqueRatt

    25HP Idles Low in Neutral

    Yes it does. The issue is the throttle barely moves until I put it in gear. I know there's a stop to limit speed in N. I just don't know how to adjust it.
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