Re: 2000 Mercury 125 Saltwater Series
I had one, same exact model/year as you're asking about. I put almost 500 hours on it and it ran like a raped ape on fire!
Yes, at idle it drops fuel to 2 cylinders, might idle a little rough, but when ya hit the gas that thing will kick in and flat boogy!
I had no issues whatsoever with it, very dependable. Like anything else, maintain it and change fluids and plugs at the recommended intervals. Loved the silent flush deal for it, the oil tank on the motor has enough capacity to do what you need to do for a day, filters are easy to get to and change if needed. I ran Pennzoil Synthetic blend TWCIII oil and used the 90W Pennzoil gear lube oil for the lower unit, never had any fouling issues even with extended trolling.
The only "quirk" of the motor is it's carburated and if not run in a while may take a little bit to warm up, but keep the bulb primed hard and have a good battery especially if boating during winter months. Summer, she fired up just fine. And it's a Merc,, so it's definately loud and has that bad ass merc sound. Definately a loud motor, and she loved to run wide open.
A plus of the motor is if you kill the battery(s) or loose juice somehow, you can pull start the motor.
I had zero problems with mine, ran like a champ and I wish I had two of them on the back of my current boat, I wouldnt hesitate to buy a carb'd Merc 125, good motor. When trolling, to get that lumpa lumpa lumpa feelin out of the motor, I would just move the throttle up a little to find the sweet spot where she'd not be so rough.