Question about 2003 Yamaha YZ 125

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I have a 1989 yz 125 but the power valve linkage is missing is there anything i can do to still get maximum performance from my bike or could you tell me how to get hold of the linkage

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Try these they are the best arround

Posted on Oct 04, 2009

  • Michael Gooding Oct 05, 2009





    Vic Eastwood Motorcycles



    London Road
    Swanley
    Kent
    BR8 8BY

    Tel: 01322-662426
    sorry forgot to add this to my comment

  • Michael Gooding Oct 05, 2009





    try these they should have any part u need

    Vic Eastwood Motorcycles




    London Road
    Swanley
    Kent
    BR8 8BY

    Tel: 01322-662426

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1 Answer

2001 yz `125 bogs on hard throttle and blows a lot of smoke


Hi, Anonymous and the usual suspects are:
1. Oil tank/pan overfilled.
2. Restricted oil return line to oil tank/pan.
3. Restricted breather operation.
4. Restricted oil filter.
5. Piston rings badly worn or broken.
6. Valve guides worn and or seals worn, crushed, missing, or have come of guide and are literally pumping oil through the valve guide.
7. O-ring damaged or missing from oil pump at crankcase junction (also results in poor engine performance). 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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http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Aug 25, 2013 | 2004 Yamaha YZ 125

1 Answer

My dirt bike is pushing out smoke when i hit the gas, why is it doing that??


Hi, Candice and the usual suspects are:
1. Oil tank/pan overfilled.
2. Restricted oil return line to oil tank/pan.
3. Restricted breather operation.
4. Restricted oil filter.
5. Piston rings badly worn or broken.
6. Valve guides worn and or seals worn, crushed, missing, or have come of guide and are literally pumping oil through the valve guide.
7. O-ring damaged or missing from oil pump at crankcase junction (also results in poor engine performance). 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.
2006 Yamaha yz125 Excessive white smoke
Thread Excessive Blue Smoke From yz250 Exhuast
YAMAHA YZ125 Owner Service Manual
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http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Feb 06, 2013 | 2003 Yamaha YZ 125

1 Answer

Yz 125 2001. starting ploblem after top end rebuild


Kinda sounds like your needle valve is sticking in your carb and it is giving it to much fuel

Jun 03, 2010 | 2003 Yamaha YZ 125

1 Answer

Just did new top end on a 1989 yz 125 it has fire compression and wont start before i did the work i could pull start the bike but would not idle or when you gave it a little throttle it would die


Hi, Lissahere 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 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 module.
Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
13. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2, TPS, ETP, IAC,or BAS).
14. Faulty neutral, clutch lever, or kickstand safety switch.
15. Faulty fuel pump or fuse or relay.
16. Faulty CDI box if applicable.
17. Tilt sensor needs a reset.
18. Security system not disarming alarm needs a 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
yz 125 wont start
YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Jan 31, 2010 | 2004 Yamaha YZ 125

1 Answer

2007 125 yz, has a miss before the power valve kicks in. short flat spot then , have keep the revs high to avoid it!!


There's no extra valve that kicks in to give the bike extra power. The term "power band" is simply referring to the RPM range of the motor that produces the most torque. Make sure the carb is clean and check the spark plug gap and fire. You need a hot blue,purplish fire not a weak white looking fire. If the plug itself is whitish in color you need to richen up the carb if it's black you'll need to lean it out. You should have a chocolate almond color. I'd bet the bike is getting too much air.

Aug 24, 2009 | 2003 Yamaha YZ 125

3 Answers

1984 yz 125 power valve how do i set it


You don't have to do anything It does it on its own as long as the pieces are all there. The power valve is the thing that opens up a larger exhaust hole for the two stroke engine. It is shaped like a spool and it twists as pressure builds due to high rpm. On the 1984 it is on the left side of the bike right up front behind the clutch cover.

Aug 04, 2009 | 2003 Yamaha YZ 125

2 Answers

2000 YZ 125 Breaks up at High RPM. We think its the power valve. any tips would be great


check fuel float level as it might not be able to keep up the flow rate at those revs
or the read valve has become weak

Jul 19, 2009 | 2003 Yamaha YZ 125

5 Answers

1997 yz 125 wont start, please help


2 stroke bike are very dependent on compression. and being a bike that is 12 years old my best educated guess is that the top end needs to be rebuilt. i usually have to have the top end done on my honda about every three years.

Jan 12, 2009 | 2003 Yamaha YZ 125

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