1987 Force 125 hp

t money

Cadet
Joined
Jul 4, 2011
Messages
15
1987 force 125 hp

I just joined but I love this forum some of you guys are top notch.

at full throttle motor sometime feels like it throttles down for a brief amount of time.

I have video:
Listen while the boat misses, at seconds: 28 43 49-51 53 58 59 1:01 1:06 1:15-1:17 1:24-1:25 1:39 1:43-1:49 1:53

I have spark

just changed the fuel feed hose

I have equal compression

Update: Today I took it out and it was the worse @ WOT went to 15 mph then back down to 5 mph was as much as I could get something is very wrong.

I would love your suggestions
 

eight tracker

Petty Officer 3rd Class
Joined
May 12, 2009
Messages
81
Re: 1987 Force 125 hp

it seems to me that you are losing gas out of some of the carbs,try cleaning out the fuel bowls on them and make sure the needle seats and fuel passages in them are clear,125hp you have 4 carbs any one acts up it shows up when you go wot.
tom
 

huskerdaninva

Petty Officer 1st Class
Joined
Jun 18, 2009
Messages
240
Re: 1987 Force 125 hp

You might want to check/re-build the fuel pump, especially the diaphragm. Cheap,easy, and needed maintenance. I'm not 100% sure from what I saw/heard that you are not intermittently losing spark at higher RPM's. I'm not sure what type of ignition you have on your rig, but I'd also check the coil(s) and/or cd box(s). I'm sure someone more knowledgeable will chime in. Good luck...
 

t money

Cadet
Joined
Jul 4, 2011
Messages
15
Re: 1987 Force 125 hp

I don't know how to check for spark at higher RPM or how to check my CD boxes at load. But I did check for regular spark and I have that.
 

2902ao

Cadet
Joined
Jul 13, 2009
Messages
15
Re: 1987 Force 125 hp

I think you and i have the same motor. Same paint, stickers, etc. I figured out I was losing spark on one cylinder at high speeds because I had eliminated everything else.....Then I had someone run the motor at wot while i took out the plugs and grounded them, one at a time....kind of a pain to do. I am no mechanic, but you might check your fuel tank.....do you have a screen in the bottom of your pick up tube? Mine was partially plugged one time...I couldn't get the pick up tube unscrewed from the tank, but I blew compressed air through the line and that cleared it. You could have the same spark problem I have, also....I'll let you know if I am able to fix mine.
 

t money

Cadet
Joined
Jul 4, 2011
Messages
15
Re: 1987 Force 125 hp

thanks for the heads up I'll go and look, I've checked the fuel before, but the winter was a harsh one I might just get a spare outboard tank and hook it up. to check if it is a fuel problem.

Also I'll replace the diaphram this week.

Now the WOT test that you did tell me more,
did you use muffs in neutral?
or at the lake in neutral?
When I put it in neutral I can't get all the way to WOT

someone in these threads mentioned the voltage regulator, I'll check that this week too.
 

Scaaty

Vice Admiral
Joined
May 31, 2004
Messages
5,180
Re: 1987 Force 125 hp

I haven't posted here in a long time, but think I can save ya a headache chasing yer tail. Its ZIP to do with gas. Its the well known dreaded "Force ignition" Same thing happened to my 88.

You need a Stator, possible one of the 2 power packs, and have the coils checked. But trust me, its the Stator causing this. Replace with the Merc upgraded one. Find a good Force/Merc wrench, and start handing over money. Trust me, as it has nothing to do with gas.
 

steveclv

Petty Officer 1st Class
Joined
May 12, 2010
Messages
242
Re: 1987 Force 125 hp

What's the source and part number for the upgraded stator?

I'm inclined to agree with you as I'm having similar issues with my 84 125HP
 

t money

Cadet
Joined
Jul 4, 2011
Messages
15
Re: 1987 Force 125 hp

steveclv

I found this site:
http://www.outboardignition.com

They have parts and testing procedure.

Well I'm going to replace the diapram today, maybe the rest of the fuel lines, then I'll see if I can figure out how to test it.
 

2902ao

Cadet
Joined
Jul 13, 2009
Messages
15
Re: 1987 Force 125 hp

Did you ever get your engine running correctly? Turned out I was barking up the wrong tree on my 1987 125 Force....the float level on one of the carbs was off.........that was the real problem.
 
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