Question about Yamaha YZ 125 Motorcycles

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Where can I find a power valve assembly diagram?

Where can I find a power valve assembly diagram fo a 1993 Yamaha YZ 125

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Posted on Jun 17, 2009

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Hi, Anonymous and the usual suspects are:
1. Severely drained or faulty battery.
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I have a 2003 yz 125 i would like to know how to set my power valve i do all my own work and if i can get a good idea i can take it from there


Hi, Stephen_b438 for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $0 you can download another one. 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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Mar 23, 2011 | 2003 Yamaha YZ 125

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I have a 1993 yz 125 took off acrossed a field went through all the gears 2 times then all of a sudden i lost the power band competely?


Hi, Kstatzer and the usual suspects are:
1. Severely drained or faulty battery.
2. Faulty regulator/rectifier or high output coil.
3. Faulty power valve, solenoid or installation.
4. Clogged air filter or exhaust.
5. Cracked or incorrect float level.
6. Float needle is not seating.
7. Faulty reed valve.
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Got a 2002 yz 125 seems like power band doesnt kick like it lost the "bing bing its firing has a new plug new ring good compression power valves in jug are clean and carb is clean not too sure on...


Hi, Mshurley3h for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $0 you can download another one. 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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Power valve position and installation for yz 125


The proper adjustment is achieved when the notch in the actuator lines up with the pin hole in the cylinder casting.

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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

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