Question about 2003 Yamaha YZ 125

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

2003 yamaha yz125

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  • Yamaha Master
  • 58,369 Answers

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

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

Posted on Feb 22, 2017

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6ya6ya
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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: yamaha yz125 wont start...

hello there guys, listen a top tip is when the engine's cold tip the bike almost right on its side nearly touching the floof, wait for the petrol to poor out of the carb over flow pipe, this should take a matter of a few seconds, stand the bike back up again and kick and that baby should start right up, if it does then you have a problem with your float, if it still doesn,t then take it to a shop and get them to check it out, hope this helps. regards sam

Posted on Jan 24, 2009

  • 18 Answers

SOURCE: how can my yamaha crypton Z reach 140kph speed?

accelerate it...

Posted on Aug 27, 2009

SOURCE: what size spark plug is the correct size for a

Hi,
The right spark plug is NGK BR9EG
Alex
PS-Don't forget to vote me, thank you!

Posted on Feb 04, 2011

rzman
  • 148 Answers

SOURCE: how can i that

Hi,,,put a bigger sprocket on the front and or smaller gear on the back wheel.

more teeth on front less teeth on rear

Posted on Mar 23, 2011

Motoxpartson
  • 185 Answers

SOURCE: yamaha yz125 2008 Have no spark on the

I don't have an exact for your model but resistance issue will be very easy to spot as when you test you will get usually zero as the reading if faulty
roughly speaking you would expect 240 - 380 and 720 - 1000 and 40 - 66 on the three pairs of wires coming direct from stator if you get zero as the reading on any of the 3 pairs then the stator is the fault... Rarely does the coil pack fault without impact or over heat but for the coil pack 0.08 - 0.10
let me know if you need clarification on testing ... Good luck!

Posted on Aug 23, 2011

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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.
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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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