Inspecting 2002 Tracker 125 HP Outboard

[redneck joe]

Is the 115 a 2 plus 2? Thought that went out in the 80s?

 

[lgaytan]

Its a 125 y dont know for sure It Is 2+2 It was mentioned here by someone, but Im not sure of that

 

[redneck joe]

From my limited knowledge that refers to a powehead that is essentially two powerheads of two cylinders each. My 1982 50 is like that, two twenty hp stuck together with some other changes to get to 50hp

 

[lgaytan]

 

[redneck joe]

You buy it?

 

[lgaytan]

Not yet, next week I'll go again to do the compression test with the spark plugs socket, but I think this engine looks very clean I'm positive about it.

 

[dfrants]

yes. it's a 2+2. and yes, you will notice it " kick in".

 

[Texasmark]

By the way this is the first time I drive a 2+2 motor, it was very noticeable a kick when power hitted of the 4 cylinders working it is not an smooth acceleration as i have with my old 50 hp, Is this a normal thing?

Your old 50 had all the cylinders active all the time. Not so with this engine.
The lower cylinders get a little fuel to keep the lube up but not enough to light off. As the throttle is increased, the fuel pressure from the fuel pump increases and that increase if felt by a couple of pressure regulated valves in the fuel line to 3 and 4. If you advance the throttle slowly above about 2000 RPM you will feel one kick in and then the other kind of intermittently until they are on line.
. The activator for those cylinders holds fuel waiting for the pressure to get high enough to cause decent flow as mentioned above.

If you hammer down on the throttle, the cam that forces fuel out of that chamber causes the fuel to "squirt out" and you get immediate activation of both lower cylinders and you will feel the power surge.

 

[Texasmark]

Is the 115 a 2 plus 2? Thought that went out in the 80s?

My 115 was a 2002 year model.

 

[flyingscott]

I recall Faztbullet making the same comment years ago. As I mentioned somewhere earlier, I wonder what Mercury did to get 10 more HP from the 115 HP with its rev limiter set to 5250.

Carbs have bigger throats on the 125 hp.

 

[flyingscott]

Is the 115 a 2 plus 2? Thought that went out in the 80s?

All the 4 cylinder 100/115/125 hp motors are 2+2 engines.

 

[flyingscott]

Its a 125 y dont know for sure It Is 2+2 It was mentioned here by someone, but Im not sure of that

2+2 means it idles on the top 2 cylinders and around 1800 RPM the bottom 2 kick in and it starts running on all 4 cylinders.

 

[flyingscott]

From my limited knowledge that refers to a powehead that is essentially two powerheads of two cylinders each. My 1982 50 is like that, two twenty hp stuck together with some other changes to get to 50hp

Not what it means at all.

 

[airshot]

Your old 50 had all the cylinders active all the time. Not so with this engine.
The lower cylinders get a little fuel to keep the lube up but not enough to light off. As the throttle is increased, the fuel pressure from the fuel pump increases and that increase if felt by a couple of pressure regulated valves in the fuel line to 3 and 4. If you advance the throttle slowly above about 2000 RPM you will feel one kick in and then the other kind of intermittently until they are on line.
. The activator for those cylinders holds fuel waiting for the pressure to get high enough to cause decent flow as mentioned above.

If you hammer down on the throttle, the cam that forces fuel out of that chamber causes the fuel to "squirt out" and you get immediate activation of both lower cylinders and you will feel the power surge.

Sounds like a problem waiting to happen....why do they make things so complicated ?

 

[racerone]

Was at the dealer where I worked over 50 years ago.-----Ordered some parts for a 75 model 6 HP Johnson.----They said those 6 hp motors were the " best " they ever built.----Best means they run nice , easy to work on and simple to repair / maintain.-----New stuff has way to much wiring and plastic.

 

[redneck joe]

Not what it means at all.

Well and explanation would be helpful

 

[Texasmark]

2+2 means it idles on the top 2 cylinders and around 1800 RPM the bottom 2 kick in and it starts running on all 4 cylinders.

Pure speculation on my part but it seems to me that a lot of boaters troll for certain types of fish. My speculation leads me to think that Mercury, in their infinite wisdom, thought they would make an engine that would take you to the fishing grounds, troll efficiently, and bring you back home.......why else would years of engine building in several mid range engines be 2+2's?

 

[racerone]

I do not believe that the 4 cylinder 2+2 was meant for extended trolling.

 

[flyingscott]

Well and explanation would be helpful

Explained several times in this post.

Sounds like a problem waiting to happen....why do they make things so complicated ?

It's a very simple system.

 

[flyingscott]

I do not believe that the 4 cylinder 2+2 was meant for extended trolling.

Mine had no problem doing it.