86 Force Idle/ accelerate problem

T

Tandarocks

Cadet
Joined
Jul 20, 2004
Messages
6
I have a 86 125 Force outboard that i just got out for the summer. I took it out to the lake to make sure everything is working for my vacation and it ran great for about 30 minuetes. After that it started to loose power and hesitate at full to half power. I stopped the boat and noticed that it was running rough. The motor now seems to gallup and not run at a smooth idel. I had this happen before, not as noticible and checked the fuel filter/screen and it was clogged and after cleaning it, it ran great. This was checked this time and the screen was clear. I check the plugs and they all were the same as far as color and moisture content, so there dosen't seem to be a too rich problem. When I checked to make sure the spark plug caps were on tight the second from the bottom shocked me while the motor was running. I'm assuming that the boot needs to be replaced but could this be the cause of my problem as far as performance and smooth ideling goes? I also tried adjusting the carbs in both direction but this didn't cure the stumbling problem. Any help would be greatly appreciated. Thanks, Todd.
 
T

Tandarocks

Cadet
Joined
Jul 20, 2004
Messages
6
Re: 86 Force Idle/ accelerate problem

I'm going to test the compression on all four cyclenders, what is a good raeading for them? i understand from other posts that it shouldn't be more than a 10 diference.
 
C

CoachHolland

Petty Officer 2nd Class
Joined
Apr 20, 2004
Messages
165
Re: 86 Force Idle/ accelerate problem

Ideal would be 150 on each, however around 125 is what I'd expect out of a motor at that age.<br /><br />Have you checked the diaphram to see if it was warped or had a tear? Could be a problem there. Additionally, trigger and/or stator problems are known to show up after the engine gets warm, leading to a weak spark condition. Are you getting anywhere close to top speed at WOT?<br /><br />As far as one coil giving you a shock, is it arching to the engine block when on? That would be a problem I would take care of first before you short out your whole electrical system. I suspect that was an initial cause of some problems with my 85 HP Force, which led me to replace everything from the stator, trigger, one power pack and one coil.
 
T

Tandarocks

Cadet
Joined
Jul 20, 2004
Messages
6
Re: 86 Force Idle/ accelerate problem

I just tested the compression and from top to bottom cold was 150, 145, 140, 150. With the engine warm it is 145, 140, 140, and 147-48. The motor has 353 hours on the hour meter. I live in Oregon and if the speeometer is correct I was right around 45- 50 WOT before the problem occured.
 
T

Tandarocks

Cadet
Joined
Jul 20, 2004
Messages
6
Re: 86 Force Idle/ accelerate problem

The carbs are clear, just checked and tore down to clean the jets, insides look clear and clean. I topped off the tank this winter so condensastion didn't or wouldn't build up. Did't add anything to the mixture. Could this be just a bad gas problem.? I replaced the spark plug boot that shocked me, rechecked and no shock this time while running. Tank is empty will fill up a five gallon gas tank of fresh mixture after dinner to see if that correct the problem, my guess is that it won't. Never that easy of a fix for me. What is a decarb? Is it just taking it apart and cleaning the jets and making sure the floats ar free and no gum build up? Thanks, Todd
 
D

DJ

Guest
Re: 86 Force Idle/ accelerate problem

Read the link at the bottom of my last post.<br /><br />Even if the carbs were just redone, bad gas can foul them in a heartbeat. I hope that's not it, but I think bad gas may have been a factor.
 
T

Tandarocks

Cadet
Joined
Jul 20, 2004
Messages
6
Re: 86 Force Idle/ accelerate problem

well I just ran the motor with a fresh gas mixture and it seems worse today. I'm going to try the sea foam like suggested in a earlier responce, but I think I might need to take it to a shop to have the electrical system looked at. I don't feal very comfortable messing around with that system. The one thing I can't figure out is why would fresh gas make the missing or stumbling problem worse. Any ideas? Thanks, Todd
 
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