Please don't yell...Its a Force Question.

TrenchFisherman

Petty Officer 1st Class
Joined
Apr 7, 2002
Messages
220
I have twin 1989 force 125's on my boat that i just recently bought. The motors sound really weak and last night i tried pulling one wire off at a time to see if some cylinders were down. I noticed that when pulling the wires it didn't make much of a difference idling but when i put it back on it seemed to jump up a few rpm's. The big thing i noticed though is when the wire was off spark arched from the coil to the metal framing surrounding the coils. Is this a bad thing? Am i losing valuable power through the block? Please help me :(
 

U68423

Petty Officer 3rd Class
Joined
Jun 29, 2003
Messages
77
Re: Please don't yell...Its a Force Question.

Shaun, no answer for your question, but maybe you can answer a few for me. What procedure do you use to start your engine? How much water spits out at idle ? Ever have difficulty during restarts when the motors are hot? thank you
 

TrenchFisherman

Petty Officer 1st Class
Joined
Apr 7, 2002
Messages
220
Re: Please don't yell...Its a Force Question.

well i haven't had the boat for a long time but like any other boat i give it about 1/4 throttle and push the chokes. if it doesn't start i pump the throttles a bit til it fires. when it is running its spitting out not a steady stream but you can definetely tell is coming out. we never really had problems restarting it but we never really had it in water yet just on ears. we did replace the pumps this year though. i think people know about my problem but they just don't like answering force questions anymore. somebody did comment on it in a previous post but didnt' answer my question completely.
 

SlowlySinking

Master Chief Petty Officer
Joined
Oct 31, 2002
Messages
897
Re: Please don't yell...Its a Force Question.

TrenchFisherman, since the engines seem tired I would suggest a compression check to get a better idea of the basic condition of the engine, if all cylinders are all low it's likely ready for a re-build. The arcing is normal when you pull a plug wire with the engine running, you were lucky it didn't arc through you, it gives a real nasty bite. The high voltage needs to go somewhere and picks the path of least resistance, in this case from the coil to ground, when doing this there is the possibility of blowing the capacitive discharge units. I suggest stopping the engine, and ground the plug wire. Restart and note the RPM difference for each cylinder. Good luck.
 

roscoe

Supreme Mariner
Joined
Oct 30, 2002
Messages
21,787
Re: Please don't yell...Its a Force Question.

If you haven't had them in the water yet, do yourself a favor and decarb the engines, before you start using the boat.<br /><br />Go to a NAPA or marine dealer and get yourself atleast 4, preferrably 6 cans of decarb. DeepCreep by Seafoam is a good brand.<br /><br />Do the decarb, then check compression, then change the sparkplugs and go have fun.<br /><br />Decarb:<br /><br />Your intent is REMOVE the existing carbon buildup from the cylinders, heads, and rings, then a spray decarb solvent product is needed. Some people use one can per cylinder.<br /><br />Run engine at fast idle, with engine running, slowly spray liberal amount into each carb, its gonna smoke up hte place,<br />spray some more for a minute or two, now spray a larger amount into carbs until engine chokes out and stops,<br />remove spark plugs and spray decarb liberally into each cylinder, install the spark plugs, let it soak for 3 to 10 hours. <br />Start the engine and run at medium throttle, or if at the lake, run it at full throttle. It won't hurt to spray some more through the carbs. Run it for atleast 10 minutes to flush the crud out of your engine. Now remove and clean, or replace the spark plugs. <br /><br />It works well to do the spraying, the night before you go to the lake. This way you can let it soak overnight, and really flush it out at the lake.<br /><br />Don't do this in front of the garage door or the house, unless you want it coated with greasy crud.
 

TrenchFisherman

Petty Officer 1st Class
Joined
Apr 7, 2002
Messages
220
Re: Please don't yell...Its a Force Question.

thanks for the post...ever hear about coils arching to the block? i think i am losing considerable amount of power there and i don't know if buying new coils would help or not
 

lonewolf5347

Chief Petty Officer
Joined
Jun 11, 2001
Messages
529
Re: Please don't yell...Its a Force Question.

TrenchFisherman check your compression on each cylinder make shure you ground the spark plug wires to ground or if you have a kill switch throw the switch to off so that the spark plug wires won't fire.Next thing to check would be the stator ,stator may be weak that another reason for loss of power.Shoot me a email I have a guide how to check the stator with a ohm meter lonewolf5347@cs.com
 

Maximerc

Petty Officer 1st Class
Joined
Jun 26, 2003
Messages
292
Re: Please don't yell...Its a Force Question.

I noticed the engine idle speed not changing on my black max.. After reading there is a Idle stablizer on the engine, it makes sence,, I think.. Maybe yours has idle stablizer too
 
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