Ignition Coils / Stator ohms readings

[Nate_34]

So I'm working on an 87 evinrude 110 v4 vro - no spark. Following the resistance tests (waiting for DVA) the stator to the starboard side reads at the bottom end of resistance spec (read 538 - spec 560 +/- 25 ohm). Port side reads 552 ohms. The ignition coils ALL read 0.8 ohms, primary to ground, spec is 0.1 +/- 0.05. The resistance between primary and high tension are all 242 ohms, except the top, port side (spec 225 - 325). The top port reads open.

Question (1) : I'm sure the top port coil is bad. What are the chances the other three are bad, when all read identical resistance values out of spec? Could the higher resistance be in my test leads?

Question (2) : Though within spec, would a low ohms reading at the starboard side stator plug be a contributor to no spark?

Question (3) : If the resistance readings are generally good, is it possible that my output readings will be bad?

History of engine - as I know. Allegedly ran summer 2017. Sat for a year. Was purchased last summer. It has be sitting until I bought it last weekend. Evidence on the boat suggests time spent in salt water (barnacle residue). The key turns the starter and the starter engages the flywheel. Not sure RPM cause I don't know how to measure that.

 

[Faztbullet]

Coils rarely fail...either pack,timer base,stator or battery /starter. Got to have min 300RPM to generate power for system. Gound be bad ground if salty dog.

 

[F_R]

You have one bad coil (the open one). Other than that, it is hard to say from resistance readings. Problem is, replacement parts may have specs that are much different than the originals. There are even a few cases where OEM specs were changed.

 

[racerone]

Load test the battery.-----Take starter apart for testing / inspection / cleaning / new brushes.-----Inspect battery cables.-----Not much money spent doing those things !

 

[Nate_34]

Racerone - battery is brand new. Everything with the starter seems okay. But I do like simple cheap ideas!!

F_R - I didn't consider the parts not being OEM. I have one new coil coming in the next day or two. I'll compare its resistance readings and see what we get.

Faztbullet - any leads on good deals for those replacment parts? I don't want this boat to be a B.O.A.T.

 

[racerone]

How did you determine that the starter is cranking at the proper speed to generate spark on this motor ???------Good luck with the project.

 

[Nate_34]

Everyone - That, is an excellent question...I don't know to how measure RPM. I bought a multimeter from orielly's that said it had that feature...but the meter didnt last a day. How do i measure rams?

 

[Nate_34]

Racerone* RPMs* stupid autocorrect

 

[racerone]

I take starters apart for inspection / testing / new brushes / cleaning.----Have a battery load tested.----Make sure battery cables are good.-------Then I know I get proper cranking speed.

 

[Nate_34]

I'll do that then. My DVA will be in this afternoon. I'll report outputs probably tomorrow. Thanks!

 

[oldboat1]

Racerone* RPMs* stupid autocorrect

Well, actually you and autocorrect had it right. RPM = "revolutions per minute".

 

[Fed]

The ignition coils ALL read 0.8 ohms, primary to ground, spec is 0.1 +/- 0.05

If you short the meter leads together it will probably read 0.7 Ohms.

RAM = Revs A Minute, LOL!

 

[Nate_34]

So DVA readings...0 port side of stator 300 starboard. Sensor coil port side reads over .3 volts...port reads 0v.

Should i still get spark on starboard side?

 

[Nate_34]

Fed - you were correct. 0.7 ohms across the leads....

Update: my son decided that I didnt need money and took it upon himself tovorder everything in my amazon shopping cart. Ipso facto - new timer is installed. Stator goes in tomorrow.

Fingers crossed there is spark.

Another question: this engine doesn't have a stand alone rectifier, but a combo rectifier/regulator. That would only cause charging issues...not spark issues, correct?

 

[Fed]

CDI electronics suggest disconnecting the stator (yellow wires) from the rectifier/regulator as part of their testing.

 

[Nate_34]

Well then. When I get the stator in I'll remove those first if I don't get sparky!

 

[Fed]

The other big test cdi recommend is to disconnect the black/yellow kill wire from the power pack then check for spark.
You need a way to stop the motor if it starts on you or ground the plug leads and test them one at a time with an air gap tester.

 

[Nate_34]

So while swapping the connectors that came with the timer base from CDI, i broke one of the plug connectors on the end of the wires. I also broke the black wire off the original harness...anybody have any idea about how to fix those? Or where to purchase replacement crimp on plugs?

 

[Nate_34]

So does anyone know if solid core spark plug wires are okay? There isnt any specifics in my manual. I also got the wrong damn wire ends....been waitong a week for the wrong part.

 

[racerone]

Ordering parts " on line " can be frustrating.-----No dealer in your area ??