Question about 2004 Yamaha YZ 125

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I have a Yamaha Teos 125 reg.'04 and the fuel /battery indicator gauge fluctuates from one side to the other when the ignition is switched on. I have disconnected the battery for a short time,but it has not cured the problem.

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This is normal and only shows the battery voltage and then swings over to show your fuel tank level so nothing to worry about.This will happen on every turn of the ignition and when switching off it reverts to the battery voltage position so if you cam eover to your bike in the morning for example(with a good battery the day before) the needle would have gone lower before switching to the petrol level indicating a weak battery so it;s only a condition check, as with cars whoi have airbags etc that show all lights then switch them off if all is okay.These are lovely powerfull mopeds and if you look after it and service it it will last many miles trouble free.

Posted on Jun 27, 2010

  • 1nchaston Nov 08, 2011

    I need help have a teos 125 year 2000 the spedo has started to go haywire any help would be gratefull

  • clint Nov 08, 2011

    The chopper on the front wheel is seezing or the cable is dry or both. Remove the front wheel and pack grease insde the black dome unit on the opposite side of the brake disc and with the speedo cable unscrewed just spray a little wd40 in and turn the cable by hand and the speedo will respond which will show the cable is not seized.If you need any torque settings&details let me know.

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1 Answer

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Hi, Robin and the usual suspects are:
1. Severely discharged or a damaged battery must have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary 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.
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Hi, Anonymous and the usual suspects are:
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2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
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5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
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1 Answer

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Hi, Emily_irwin and the usual suspects are:
1. Fuel tank empty.
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4. Fuel supply valve/petcock turned off.
5. Fouled spark plugs.
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8. Fuel valve/petcock or filter clogged.
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11. Fuel injectors clogged.
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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 lever, or 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.
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5. Faulty system and or ignition relay, check for continuity.
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7. Faulty CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
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9. Faulty neutral, side stand or clutch lever safety switch.
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12. Water or dirt in the fuel system, or clogged filter.
13. Restricted, blocked or kinked fuel line.
14. Faulty fuel pump.
15. Faulty pressure regulator.
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17. Lean angle switch is faulty or needs adjustment.
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