Question about 2003 Yamaha YZ 125

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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

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  • Yamaha Master
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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.
Power Valves
Yamaha YZ125 Power Valve Repair Fix with Roll Pin
YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Posted on Jul 18, 2016

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6ya6ya
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Posted on Jan 02, 2017

  • 3567 Answers

SOURCE: 2003 yahama yz 125 radiator

Google " motorcycle salvage yamaha ". You should be able to find a good used radiator there.

Please rate this solution. Thanks

Posted on Apr 09, 2009

  • 3567 Answers

SOURCE: I have a 95 yz 125 head and 98 yz 125 bottom end.

You have a 50/50 chance that they will work okay. All the mounting holes need to line up and the cooling holes as well. Get a head gasket for the '98 and see if all lines up. Will the exhaust pipe fit the '95?

Posted on Apr 30, 2009

  • 850 Answers

SOURCE: 2000 YZ 125 Breaks up at High RPM

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

Posted on Jul 20, 2009

  • 4088 Answers

SOURCE: 1984 yz 125 power valve how do i set it

I'm not aware of a power valve in a bike. Are you speaking of the carburetor? The only adjustments are idle mixture, idle speed, the needle position in the slide valve, and the main jet which must be replaced with a different size to adjust. The slide needle has several positions to place a small 'c' clip--pick the middle groove. Seat the needle retainer fully. The idle mix adjustment is basic set at 1-1/2 to 2 turns CCW from CW stop. Leave the main jet alone. Adjust idle speed so that the engine keeps running. Adjust the idle mix for best idle and so that the engine follows the throttle. The needle position affects mainly mid-speed operation.

Posted on Aug 04, 2009

mxtras
  • 194 Answers

SOURCE: 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.

Posted on Nov 13, 2009

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1 Answer

My 1999 yz 125 runs well at high rpm but won't idle and when I give it full throttle it bogs.


Hi, Anonymous 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.
For more information about your question and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
UPDATED 2005 YZ125 bog issue with videos
Dirt Rider Magazine
YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Jan 09, 2014 | 2003 Yamaha YZ 125

1 Answer

My 1999 yz 125 runs well at high rpm but won't idle and when I give it full throttle it bogs.


Hi, Anonymous 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.
For more information about your question and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals
OEM parts for Yamaha
YAMAHA YZ125 Owner Service Manual
Dirt Rider Magazine
UPDATED 2005 YZ125 bog issue with videos

Jan 09, 2014 | 2003 Yamaha YZ 125

2 Answers

I have 2003 yz 125 it runs teriffic and shift's grate 1-5 but it wont go in to 6st gear . any ideas


Well - you will first have to buy an earlier model to get into 6th gear. The 2003 YZ 125 is a 5 speed transmission. There's nothing wrong with your bike.

Feb 17, 2011 | 2003 Yamaha YZ 125

1 Answer

How much is the price of this bike?


Hi,
I don't know where do you live, but here, in Italy you can buy it
from 1200 to 2500 euros.
http://moto.yakaz.it/yamaha-yz-125-2003
http://auto.trovit.it/auto-usate/yamaha-yz-125
Good luck,
Alex
PS-Don't forget to vote me, thanks!

Nov 24, 2010 | 2003 Yamaha YZ 125

1 Answer

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.

Sep 12, 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

1 Answer

2003 yahama yz 125 radiator


Google " motorcycle salvage yamaha ". You should be able to find a good used radiator there.

Please rate this solution. Thanks

Apr 09, 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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