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Old 05-01-2011, 05:22 PM
BleedMarshall's Avatar
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Default 2006 YZ125 Ignition System. Who knows them?

     

Bike
2006 YZ125

Issue
No spark

Quick Breakdown
Bike getting fuel, nothing siezed. Son took bike out, ran fine, shut the bike off, then would not restart. Kill switch reading proper resistance, as is the plug cap, plug wire, Pick-up Coil, and Source Coil 2. Problem thus far either Source Coil 1 or the CDI Wiring Harness, plug connection = doubtful or Source Coil 1 = most probable.

When I traced it the the Source Coil 1, the leads (blk/red & grn/white) read zero, which indicated the wiring harness initially. However, upon doing a continuity check, the leads read good, thus possible plug where it connects to the CDI, or it is the Source Coil 1 behind the magneto.

I think I have it pretty well narrowed down as a triple checked each component to insure proper resistance at all connections. However, electrical systems were not always my strong point. Since I have continuity through each lead, the wiring harness/CDI connection should be good since I have continuity, right? I have it ordered just in case, but my next question is the part name for the Source Coil 1. All I am seeing is a part named Base Assembly. Can someone point me in the right direction here? The damn part is approx. $170-$180 before shipping costs where applicable if it is the right one, and I don't want to waste money.

I am seeking some reassurace more than anything here since I am not great at electrical systems.

Also, the manual asks for a rotor holding tool, which I do not own, for teardown and rebuild. Is this a clutch holder, or a seperate tool altogether?

Thanks in advance.
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Old 05-04-2011, 07:29 PM
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Really? No one knows about this type of thing? Ok then. I guess I will take the title of knowing the most.

I nailed it down to the stator, and after I get the tools I need (clutch/rotor holding tool and flywheel puller) I will be out less than $150 before shipping costs.

I thought maybe it was the wiring harnes, but I double checked the continuity of the leads, and they show continuity. This breaks it down to the Source Coil 1, which means I am replacing the stator in the bike.

Of note, the stator for a 2006 YZ125 will fit all years up to the current 2011 model, but not any earlier models than a 2006.

I plan on working up a rather long and indepth breakdown of the rebuild for another forum, so I will post it here as well in case anyone else needs it.

Thanks anyway for looking.
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Old 05-05-2011, 01:22 PM
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Thanks for this info. I have your exact bike. I hope I don't need this info, but it's great to have if I ever do.
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Old 05-05-2011, 01:47 PM
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Easy troubleshooting if you have a multi-meter. I was thrown by no spark after the bike had run for hours. However, looking back I see the signs of the stator breakdown. I was fouling plugs with a clean and well adjusted carb (stock jetting), and fouling them bad and often. The Source Coil 1 was not firing like it should have been, thus not giving proper spark to burn off the mix in the combustion chamber. Additionally, my son said the bike had less power than he remembered, something like 90% as strong as it was. If the plug was not being fed enough to ignite the full mix, then it would not have run at optimum power.

I will give a full trouble shoot and run down once I get my money up for parts and they come in for you and the rest of the forum.
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Old 05-05-2011, 02:22 PM
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That sounds great. Our bike is actually very new to us so I don't yet know all nuances of it at this point, but I have already fouled a plug. But it was only 1 plug, and hasn't done it since.

This may also give me the excuse to buy a multi-meter, which I've wanted for a while but couldn't justify.
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Old 05-05-2011, 03:34 PM
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Don't skimp on a multi-meter. Get one with several features. I own one by Fluke, and use it everywhere around the house. Water heaters, breakers, outlets, etc. I solve quite a bit with one problem wise. Yet, they are highly needed in testing a bike and the electrical system.

As for the bike, I have torn into mine at every point. The only things I have yet to tear into is the bottom end, forks, and clutch. I put a top end on it not long after getting it, all but rebuilt the carb, and now gone through the electrical system. Mind you I did the top end more for piece of mind, tore the carb down when I was trying t o solve the fouling issue, and now the electrical due to the stator. I did all this for piece of mind as I bought it used from a guy who did not do his own work/maintenance. I did the top end for assurance, and the carb trying to solve the fouling issue I mentioned. I know to check the stator if the carb is right though.

Otherwise, I thrash every trail around the house. I am 6'2"+ and 210-215 before lunch and it has plenty of power for me. Sadly the adrenaline junkie wants more along the lines of a 250 smoker, which is fine as my son will take full riding responsibility of the 125 then. As soon as I get this sciatic nerve healed I am taking her to the track. You have a good bike with a YZ125, and from all accounts the 2006 model was a fine year and very reliable.
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Old 05-05-2011, 04:23 PM
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Yeah that's why we bought that year.

Fluke's are nice. I do plan on getting a nice one. Good luck with the 250 smoker, that should be fun.
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Old 05-05-2011, 09:38 PM
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Ha! I just noticed the Dept. of Redundancy Dept. in my post. I forgot to fully edit my rewrite!

I have yet to narrow down what 250 smoker I want, but I am leaning Blue. I just know I need a little more power and grunt. That, and the 125 has yet to scare me. Though, my son did manage to break his collarbone on it. about two months ago. I also know that I have plans to make the YZ125 a YZ144 once I get my 250. I just can't do it now as I would jones too bad to ride. Hahahaha!
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Old 10-07-2017, 07:06 PM
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Default Yz125 no spark

2006 yz125 no spark

Traced the problem down to a bad coil... this coil has a secondary coil system in it just wondering what the views are in wiring in a coil with just one primary lead instead of a 2 wire coil pack with a primary and secondary
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Old 10-07-2017, 08:39 PM
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All ignition coils have a primary and a secondary winding in them.
The coil can be tested on each of these by doing a OHMs test on each. There are spec's for each in most service manuals.
That really should have been one of the very first things to check as rust and dirt can change these readings as well as a dirty spark plug cap and thus cause the loss of spark.

Paw Paw
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