2000 Proline with 125hp 2 stroke oil injected motor

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Author Topic:   2000 Proline with 125hp 2 stroke oil injected motor

miro posted 06-13-2007 10:54 PM ET (US)
Guys,
I am relatively new to boating and just looked at a 2000 Proline with Mercury 125 hp 2 stroke oil injected boat. The boat has 100 hours according to the owner and the price seems to be right. The seller told me that these motors have capability to run on either 2 or 4 cylinders mode. This scares me a bit. Is this by design? I never seen conffiguration like this. The boat seems to start with a turn of a key. Another question: When running at full speed the RPM is about 5000 . Is it normal? The temp guage is showing normal. Just wanted some expert opinion.
Thanks in advance.
an86carrera posted 06-13-2007 11:22 PM ET (US)
All sounds normal to me. A compression test is always a good idea.
Yes, some Mercurys do that.
Len
miro posted 06-13-2007 11:37 PM ET (US)
You mean 2+2 cilynders or 5000 RPM? I am actually goin to survey the motor tommorow.
merc125 posted 06-14-2007 06:26 AM ET (US)
Max rpm is 5250, max torque is at 5000. Yes that engine runs on 2 cylinders at low speed. Don't buy that boat without a sea trail. People either love or hate the motor and the way it shifts to 4 cylinders. The 125 is very fuel efficient at low speed, plenty of power, and will last a very long time if not reved over 5250. My only problem was the under cowl oil tank would always leak when the motor was tilted up and the tank was full. Tank and cap replacements did not produce a lasting solution. MartyD
miro posted 06-14-2007 08:30 AM ET (US)
I took it for a Sea trial and here is what I noticed:
1. Trhottle is not very sensitive.
2. The boat will go either fast or slow, there is almost no middle.
3. Engine temp stays low regardless of speed and torque.
4. Took it through some 2-3footers with confidence.
I am going to survey the boat today.
Any advise would be welcome. Thx!
Tom W Clark posted 06-14-2007 10:36 AM ET (US)
My advice is to buy a Whaler.
Whaler_bob posted 06-14-2007 10:40 AM ET (US)

quote:
I took it for a Sea trial and here is what I noticed:
...The boat will go either fast or slow, there is almost no middle.

Not good!
Most recreational boaters need midrange speed. If that characteristic is normal for the Merc 2+2 engines- then I can see why merc125 said "People either love or hate the motor and the way it shifts to 4 cylinders". Did you mention your observation to the owner?
jandrewg posted 06-14-2007 01:00 PM ET (US)
The Mercury 125 is a good motor if set up right. I have one and have put 100's of hours on it. Very low fuel consumption at moderate speeds.
If the carbs are adjusted correctly, it will settle into a nice idle after about a minute or less, and stay there for the whole day if you want it to. The transition from 2 to 4 cylinders happens at about 1800 rpm, depending on the prop (relates to how heavy the load on the motor is at a given RPM). There is a middle RPM running range, but you have to throttle up and through the transition, then back down to 2000-2500 RPM if that's where you want to be.
The oil tank was a joke for 1994 and 1995; a very bad design rectangular lid. There is a refit kit that I bought that changes the tank to one with a screw-in cap. It fixes the problem. 1996 and up models came with the newer design.

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Author	Topic: 2000 Proline with 125hp 2 stroke oil injected motor
miro	posted 06-13-2007 10:54 PM ET (US) Guys, I am relatively new to boating and just looked at a 2000 Proline with Mercury 125 hp 2 stroke oil injected boat. The boat has 100 hours according to the owner and the price seems to be right. The seller told me that these motors have capability to run on either 2 or 4 cylinders mode. This scares me a bit. Is this by design? I never seen conffiguration like this. The boat seems to start with a turn of a key. Another question: When running at full speed the RPM is about 5000 . Is it normal? The temp guage is showing normal. Just wanted some expert opinion. Thanks in advance.
an86carrera	posted 06-13-2007 11:22 PM ET (US) All sounds normal to me. A compression test is always a good idea. Yes, some Mercurys do that. Len
miro	posted 06-13-2007 11:37 PM ET (US) You mean 2+2 cilynders or 5000 RPM? I am actually goin to survey the motor tommorow.
merc125	posted 06-14-2007 06:26 AM ET (US) Max rpm is 5250, max torque is at 5000. Yes that engine runs on 2 cylinders at low speed. Don't buy that boat without a sea trail. People either love or hate the motor and the way it shifts to 4 cylinders. The 125 is very fuel efficient at low speed, plenty of power, and will last a very long time if not reved over 5250. My only problem was the under cowl oil tank would always leak when the motor was tilted up and the tank was full. Tank and cap replacements did not produce a lasting solution. MartyD
miro	posted 06-14-2007 08:30 AM ET (US) I took it for a Sea trial and here is what I noticed: 1. Trhottle is not very sensitive. 2. The boat will go either fast or slow, there is almost no middle. 3. Engine temp stays low regardless of speed and torque. 4. Took it through some 2-3footers with confidence. I am going to survey the boat today. Any advise would be welcome. Thx!
Tom W Clark	posted 06-14-2007 10:36 AM ET (US) My advice is to buy a Whaler.
Whaler_bob	posted 06-14-2007 10:40 AM ET (US) quote: I took it for a Sea trial and here is what I noticed: ...The boat will go either fast or slow, there is almost no middle. Not good! Most recreational boaters need midrange speed. If that characteristic is normal for the Merc 2+2 engines- then I can see why merc125 said "People either love or hate the motor and the way it shifts to 4 cylinders". Did you mention your observation to the owner?
jandrewg	posted 06-14-2007 01:00 PM ET (US) The Mercury 125 is a good motor if set up right. I have one and have put 100's of hours on it. Very low fuel consumption at moderate speeds. If the carbs are adjusted correctly, it will settle into a nice idle after about a minute or less, and stay there for the whole day if you want it to. The transition from 2 to 4 cylinders happens at about 1800 rpm, depending on the prop (relates to how heavy the load on the motor is at a given RPM). There is a middle RPM running range, but you have to throttle up and through the transition, then back down to 2000-2500 RPM if that's where you want to be. The oil tank was a joke for 1994 and 1995; a very bad design rectangular lid. There is a refit kit that I bought that changes the tank to one with a screw-in cap. It fixes the problem. 1996 and up models came with the newer design.