Question about 2003 Yamaha YZ 125

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Cdi box I have a 03 yz 125 that was brought to me in pieces. Where does the cdi box mount?

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There a mounting spot between the radiators its a perfect fit for the slot on the box and its a tight fit

Posted on Apr 02, 2009

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IT MOUNTS ON THE TOP MOTOR MOUNT! THERE IS A BRACKET ON THE BOX THAT ATTACHES TO THE "TRIANGLE" MOUNTS WITH ONE BOLT 

Posted on Mar 09, 2009

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It should mount under the seat

Posted on Feb 17, 2009

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1 Answer

I have a yz250 1999. and the cdi box is bad i want to buy a cdi from yz 250 2003 and i dont know is working on my bike?


Its not supposed to work on your bike "BUT" I have a 2006 raptor 660 CDI on my 02 warrior 350 and it works better than stock and is supposedly "non-compatible" with the warrior the only thing different with your bike and the 03 is the TPS

Jun 08, 2014 | 2003 Yamaha YZ 250

1 Answer

My Yamaha YZ125 doesn't start but it has spark. What can be the problem?


Hi, Ihyo and the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enricher.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Fuel line to the carburetor or throttle body pinched or kinked.
8. Carburetor float stuck.
9. Fuel injectors clogged.
10. Severely discharged or damaged battery you need 12.5 volts or better and be able to pass a load test if necessary.
11. 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.
12. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and CDI box.
Spark plug cables in bad condition and shorting check for leakage in the dark, cable connections loose, or connected to the wrong cylinders.
13. Ignition timing incorrect due to a faulty MAP, CKP, O2, TPS, sensors.
14. Faulty neutral, clutch lever, or kickstand safety switch.
15. Faulty fuel pump or fuse or relay.
16. Faulty CDI box.
17. A stuck bent or burnt valve.
18. Tip over sensor needs a reset.
19. Check for engine trouble codes.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
98 YZ 125 won start
yz 125 wont start
YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Jul 29, 2012 | 2003 Yamaha YZ 125

1 Answer

03 yamaha yz 125 there is a knocking noise from the transmission after rebuild of engine.


Hi, Jeds351 I would love to help you with your engine or chassis noise but I just loaned my brand new pair of listening ears to your local dealer's chief technician so he could take your bike for a test ride and give you his professional opinion and estimate about your noise and repair cost. For more information about your issue and valuable "FREE" downloads that you need please click on the links below. Good luck and have nice a day.
YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals
yz 125 tips and tricks YouTube
Yamaha YZ 125 05

Sep 15, 2010 | 2003 Yamaha YZ 125

1 Answer

Im losing spark after my yz 125 engine warms up, why?


Hi, Jeffreyo76 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
99 yz 125 no spark Yamaha 2 Stroke
YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

May 19, 2010 | 2004 Yamaha YZ 125

1 Answer

I need help i have a 1990 yz 125 i have fire from the scatter plate to the cdi box i also have fire from cdi box what i need to know is how to hook it up to the kill switch and the coil


you run the positive lead from the cdi to the positive lead on the coil.... then somewhere between the negative lead on the coil and the frame/engine ground you splice in the kill switch.........what that does is breaks the ground when you push the kill switch which then kills the spark to the motor

Aug 19, 2009 | Yamaha YZ 125 Motorcycles

2 Answers

Yz125 no spark


G'day i am a . YZ 125 j ...lets see now! You could perform these tests yourself.Check your plug CAP,if in doubt replace it with a new one. Take the below ohm figures and see if they match up. Pulse coil: white/blue and white/red= 310 ohms. low speed coil: Green/white and Black/red= 900 ohms. high speed coil: Green/blue and black= 55 ohms. hope this has helped in some way to helping you solve your problem.If it has please leave feed back.Ride hard , see ya,Tabbycat

Jul 22, 2009 | 2003 Yamaha YZ 125

1 Answer

03 yz 125 suspension set-up


You need to start with the spring sag. You need of 3 inches of sag front and rear with you on it and all of your riding gear on. you will need a friends help to measure for you.

May 22, 2009 | 2003 Yamaha YZ 125

1 Answer

Oil for yz 125


yes that will work BUT,i have a 03 660 raptor and all i use and recommend is yamahlube.

Apr 26, 2009 | 2003 Yamaha YZ 125

1 Answer

Cdi box


it is mounted under the left side of the tank dont put it near the radiator your cdi unit will not last long coz of it's high temp.

Apr 02, 2009 | 2003 Yamaha YZ 250

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