How Common

[oxmax360]

Hi all,
New to this forum, and have a few questions from you pros, I own a 125 force and am having a problem with # 2 not firing, every now and then it will kick in, but for the most part it is doa, I was wondering how offten does a CDI module go out on one side, only causeing it to lose spark on one of the cylders, any info would help.
Thanks

 

[jerryjerry05]

Re: How Common

That could be just a bad connection?
I usually just replace them all (connections)on the pack,stator and trigger.

That won't work.
Then CDI electronics Or outboard ignition . com
Both have test procedures for your motor.

What year and model#?

 

[oxmax360]

Re: How Common

Hi JerryJerry05,
Thanks for your info, It is a 1989, not sure of the model# can't find the darn thing, do you know where I can find the new connectors? any info would be helpful.

 

[Frank Acampora]

Re: How Common

It is much more common for only one side of the CD box to fail than for both sides to fail at once.

 

[oxmax360]

Re: How Common

Thanks Frank, That is what I was thinking, but was unsure if the cd would just go out or would still fire on one side, that helps I have ordered a new cd box it will be here in a few days, lets hope it is that simple.

 

[jerryjerry05]

Re: How Common


Any auto parts store or Radio Shack even Wally world will have the connectors.

While your waiting??
Do a compression test.
Remove the carb and check the reeds?
Swap the coils on the top two cylinders to see if it goes to a different plug?

 

[oxmax360]

Re: How Common

Thanks Jerryjerry05, I did a compression test, 150 all the way, swapped the coil wires from the cd box to the coils and #2 fired and #4 quit firing, Not sure how to check the reeds? I will check for the new connectors, Thanks again. Also I am going by firing order of 1,3,2,4 top to bottom.

 

[emoney]

Re: How Common

If you pull the carbs off, you should be able to do a visual inspect of the reeds?

 

[afarrens]

Re: How Common

CDI box failure can lead to stator issues or vice versa - don't run the engine until the problem is resolved or your going to be fixing more then one issue.

 

[Jiggz]

Re: How Common

Thanks Jerryjerry05, I did a compression test, 150 all the way, swapped the coil wires from the cd box to the coils and #2 fired and #4 quit firing, Not sure how to check the reeds? I will check for the new connectors, Thanks again. Also I am going by firing order of 1,3,2,4 top to bottom.

This basically confirms the CDM originally feeding #2 is bad. I know you already ordered so you are on the right track.

 

[oxmax360]

Re: How Common

Thanks for all the information it really helps, I did run the motor a few times, hope I don't have any other issues, will be changing the cdi module in a few days will update soon as I bolt it on and fire it up, and again thanks.

 

[oxmax360]

Re: How Common

UPDATE not the cdi module, maybe the trigger or stator.... the force was not with me this time....

 

[jerryjerry05]

Re: How Common

You replace the connectors on the pack,stator and trigger?
I was working on a 125 and it was beating me up pretty bad.
One minute it was checking out ok and then it wouldn't??
I accidently wiggled a wire and it gave a different reading.
Seems under the shrinkwrap the wire had broken.
I replaced the connectors on all the parts and it worked.
That saved me from throwing away a good stator and trigger.

After that,CDI Electronics or Outboard ignition . com
Both have test procedures for that motor.

Do the resistance tests AFTER you change the connectors.
You have access to a DVA or peak reading volt meter?

 

[Jiggz]

Re: How Common

UPDATE not the cdi module, maybe the trigger or stator.... the force was not with me this time....

That is not quite in line with your diagnosis when you switched the CDM's. It cannot be the stator for sure because if it is, both #1 & #2 will not fire since they are both fed from the same stator wires. It could be the trigger but if that is the case,when you switched the CDM's #2 cylinder should have stayed not firing instead of #4 as you mentioned.

Are you using an in-line spark tester for diagnosing this or just disconnecting the spark plug wires and check it to ground or listening for change in engine tone? I recommend using an line spark tester it costs less than $10 at Auto Zone. Anyways, do a visual and continuity check of all wirings going to the stator and trigger just to make sure. This might involve removing the flywheel for a complete check.

 

[oxmax360]

Re: How Common

That is not quite in line with your diagnosis when you switched the CDM's. It cannot be the stator for sure because if it is, both #1 & #2 will not fire since they are both fed from the same stator wires. It could be the trigger but if that is the case,when you switched the CDM's #2 cylinder should have stayed not firing instead of #4 as you mentioned.

Are you using an in-line spark tester for diagnosing this or just disconnecting the spark plug wires and check it to ground or listening for change in engine tone? I recommend using an line spark tester it costs less than $10 at Auto Zone. Anyways, do a visual and continuity check of all wirings going to the stator and trigger just to make sure. This might involve removing the flywheel for a complete check.

I plan on redoing all my connectors, and i am using a sprak tester, I think jerry and you are right connector and wire needs to be checked, even under the dark side of the flywheel, lol the force is not strong with this one, sorry about the jokes but it keeps me from going nuts, I realy love force motors, but they can be a pain, will update after I check the wires and connectors..

 

[oxmax360]

Re: How Common

UPDATE: I have changed all the connectors, STILL no fire on number 2 guess next step trigger and stator. Will update after I pull the flywheel.....

 

[Jiggz]

Re: How Common

If you have working knowledge of voltmeter, you can do a voltage reading on the wires feeding the #1/#2 CDM. There are two sets of wires to the connector, White/Grn & Red and Green & Orange. The AC voltage on each set is low around 0.5~1.0 VAC. One set of those wires feed each cylinder coil. A comparison reading should indicate where the fault lies.

 

[oxmax360]

Re: How Common

Update: It is fixed, some how a foot broke off the trigger, and the dang thing got up under the flywheel and tore up the stator,????? Dont have a clue how it did that but it did only one spot was messed up I put a new trigger and a new stator and it lives agian, hitting on all four, running like a champ, anybody else evr have something like that happen? Would like to know. I have pics of what happed also will post as soon as i figure out how to.