Question about 2003 Yamaha YZ 125

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I have a yamaha yz 125 1994. I have a problem with a weak spark.. i thought it was the stator but when we applied a volt check there was 12 on the stator. but as we go up to the coil there is less and its less on and off, sometimes there is zero. so i thought of this, i have an old lawnmower, can i take of the coil of lawnmower and apply it to my dirt bike?

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  • chris bauer
    chris bauer Apr 12, 2014

    nO spark is sensitive, find used coil at motorcycle salvage,

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It will be the coil buddy what you can do is try the coil off the lawnmower on the bike but just to test it as you will lose performance if kept on there

Posted on Sep 30, 2009

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2005 Yamaha YZ 125 will not start


Hi, James your timing is too far advanced otherwise the usual suspects are:
1. Fuel tank empty.
2. The fuel tank has old dead gas.
3. Fuel tank bottom contaminated with ethanol sludge, dirt, water, rust, etc.
4. Fuel supply valve/petcock turned off.
5. Fouled spark plugs.
6. Engine flooded as a result of overuse of the choke.
7. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
8. Fuel valve/petcock or filter clogged.
9. Fuel line to carburetor or throttle body pinched, kinked or blocked.
10. Carburetor float stuck.
11. Fuel injectors clogged.
12. Fuel injectors stuck open.
13. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a cursory reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead-acid batteries.
14. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
15. Loose or corroded wire connection at the coil or plug between ignition sensor and ECM module.
16. Spark plug cables in bad condition and shorting check for spark leakage in the dark, cable connections loose, or connected to the wrong cylinders.
17. Ignition timing incorrect due to a faulty ignition coil, ignition module or MAP, CMP, CKP, O2, TPS, ETP, IAC sensors.
18. Faulty neutral, clutch, kickstand safety switch.
19. Faulty fuel pump or fuse or relay.
20. A stuck bent or burnt valve.
21. Tilt sensor needs a reset.
22. Security system not disarming alarm needs a reset.
23. Check for engine trouble codes.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
yz 125 wont start
2005 Yz125 Not Starting
YAMAHA YZ125 Owner Service Manual
https://www.partsfish.com/page/oem-parts-for-yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Feb 09, 2015 | 2005 Yamaha yZ 125

1 Answer

Check stator


Hi, Anonymous and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
3. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting / leaking, spark plug cable connections loose.
6. Faulty ignition coil or electronic control module or CDI box.
7. Faulty CKP, CMP, or BAS sensor.
8. Faulty ignition switch.
9. Tilt sensor needs a reset.
10. Security alarm failing to disarm needs reset
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
YZ250 lost spark all tests checked out OK
Yamaha YZ250 Project Part 1 No Spark
YAMAHA YZ250 LC Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


Apr 05, 2014 | 2007 Yamaha yZ 250

1 Answer

Yz 125 1991 no spark


Hi, Anonymous and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
3. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting / leaking, spark plug cable connections loose.
6. Faulty ignition coil or electronic control module or CDI box.
7. Faulty CKP, CMP, or BAS sensor.
8. Faulty ignition switch.
9. Tilt sensor needs a reset.
10. Security alarm failing to disarm needs reset
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
YZ125 2003 2005 No Spark
How to fix No Spark Problem on Motorcycles and Dirt Bikes
YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


Sep 18, 2012 | Yamaha YZ 125 Motorcycles

1 Answer

On my yz250 had no spark, figured out it was my stator, so i put a new one in and it started right up. rode it for 5 mins quite on me again and have no spark...traced the problem to the stator again??


Hi, Anonymous for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
YAMAHA YZ250 LC Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals
How To Make Yamaha YZ 250 Two Stroke Even Better
Yamaha YZ 250 02

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

May 18, 2012 | Yamaha YZ 250 Motorcycles

1 Answer

1989 yz 250 no spark


Hi, Anonymous and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
3. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting / leaking, spark plug cable connections loose.
6. Faulty ignition coil or electronic control module or CDI box.
7. Faulty CKP, CMP, or BAS sensor.
8. Faulty ignition switch.
9. Tilt sensor needs a reset.
10. Security alarm failing to disarm needs reset
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Dirt Rider Magazine
Yamaha YZ250 Project Part 1 No Spark
YAMAHA YZ250 LC Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


May 02, 2012 | Yamaha YZ 250 Motorcycles

2 Answers

My yz 250 will start with a roll start,but I can't


Not sure of the age of your YZ 250 ( You never said!) but in most Yamaha they use dual stage stator which means a stator will charge a spark plug at two speeds one on kick starter speed and the other on running speeds it is common that the low speed circuit on the stator to fail leaving you with a bike that only starts when pushed its a very simple test to diagnose it be worth checking you have spark on kick starter speeds with spark plug out the motor but still connected

Dec 04, 2011 | 2003 Yamaha YZ 250

1 Answer

Ho wdo i find power to install a 12 volt light to


YZ series mx'rs dont have a lighting coil thus do not have a 12v supply.WR series do.(but they don't come in 125cc at least not here in Oz). Am not sure if WR 250 stator will fit(I very much doubt it).The best next suggestion is to check in MX magazines in advertising section uasually at rear of mag for stator repairers & ask them for advice.

Nov 23, 2009 | 2003 Yamaha YZ 125

1 Answer

I have a 2001 yz80. The spark seems weak. I tested the coil and its fine. I tried it with the kill button disconected, it didnt help.How do I test the stator and cdi? Am I on the right track?


yes buddy the only way to test the cdi is too put on another bike and if it was the stator it wouldnt spark and yes you are on the right tracks but maybe it could be the plug does it run brilliantly

Nov 06, 2009 | 2003 Yamaha YZ 125

1 Answer

Yz426 with a wr426 stator,flywheel but no spark??


Hi, Mrhoads62 for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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Yamaha YZ426F Owner Service Manual
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Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Apr 29, 2009 | 2001 Yamaha YZ 426 F

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