Question about 2003 Yamaha YZ 125

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Yamaha warrior won't start

My 94 yamaha warrior doesn't seem to start its getting spark and gas to the engine what could be wrong it was running fine when it just died

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  • Anonymous Apr 29, 2009

    thanks for your help but no i haven't done anything. this happened like 2 days ago i was riding it just fine when it turned off. i took it home and checked it, it has spark and fuel to the cylinder

  • Anonymous Apr 29, 2009

    i don't think so i still have compression you think it could be something electrical

  • Anonymous Apr 29, 2009

    do you know how the time might slip



  • Paul Hutchinson May 11, 2010

    I think that you need to check that you haven't holed the piston or blown the head gasket. Very common on 2 strokes.

  • Paul Hutchinson May 11, 2010

    Have you changed anything at all since last running the engine, or a few weeks before it dyed?
    Like the exhaust being changed or plug?


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My cuzin had the same problem with his 99 warrior it was the stator in the left side the case its electrical it will cost around 150.00 for it, down where ur shifter is the black case says something on it like yamaha take that off u will see the stator, its a wire that runs into the case. it looks like a big magit with wires to it.

Posted on Jun 02, 2009

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If you are getting a nice bright blue spark then no, the last time I had a problem like this it was sugar in my tank. If you taste a bit off your finger and it is the slightest bit sweet, then some one has sugared your tank. If so just flush the tank with a little fresh fuel and then flush the carb, and fuel lines by spinning the engine over for a bit then try to start again.
Is yours an electronic ignition or points. If points gap could be wrong or even timing slipped. That has happened to me also.

Posted on Apr 29, 2009

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A yamaha warrior isnt a 2 stroke. they make a street bike nad a four stroke quad. Check your carburator. check your spark plug and check your stator. it may be very minor considering it was running fine then just went out. no noise or anything. you would have heard something if you broke something internal.

Posted on May 21, 2009

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Stopped and got gas then it started and died, acts like it's not getting any fire


Hi, Anonymous and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Failed alternator/generator and or voltage regulator.
3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.
4. Failed main circuit breaker or ignition switch, check for loose connections and continuity.
5. Failed system and or ignition relay, check for continuity.
6. Failed ignition coil, ignition/electronic module.
7. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
8. Throttle cables and or idle speed improperly adjusted hot idle speed should be 950 RPM to 1000 RPM.
9. Air/fuel mixture screw improperly adjusted.
10. Accelerator pump damaged or not working.
11. Water or dirt in the fuel system, carburetor or filter.
12. Restricted, blocked or kinked fuel line.
13. Fuel tank empty.
14. The gas cap is not venting properly or fuel tank venting system blocked.
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16. Needle and seat stuck closed in the float bowl.
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Hi, Jamesw302002 and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a "LOAD" test "WARNING" you can have 12.5 volts or better but little or zero amps and the battery must be replaced.
2. 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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Hi, Jjs186 and 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 enrichner.
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.
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20. A stuck bent or burnt valve.
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22. Security system not disarming alarm needs a reset.
23. Check for engine trouble codes.
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