Question about 2004 Yamaha YZ 125

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I have a 2004 yz125 it has good power on the bottom end but 4@5 gear it falls on its face like the power band is not coming in

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You most likely blew it up.. you could have a leaking head gasket but its most likely your piston and rings

Posted on Feb 18, 2012

  • kblackburn70 Feb 19, 2012

    I noticed it does not have much compression I will change the top end

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Need to replace piston and ring in 2004 yz 125


Hi, Anonymous 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 24, 2013 | 2003 Yamaha YZ 125

1 Answer

On my 2004 suzuki vl 800 I want to take off the back tire on the left side where you put the gear oil does that come off with the tire


Yes, the oil reservior separates from the wheel assembly. Here is the whole process for removing the rear wheel assembly. In order to remove the rear wheel assembly, you are going to need a motorcycle lifting jack stand or similar device.

1. Stand the bike on the side stand

On the left side of the rear wheel:

2. Remove the two forward facing bolts.
3. Remove the allen head bolt with the wide head.

On the right side of the rear wheel:

4. Remove the brake adjuster nut on the end of the actuating lever.
5. Remove the Toque link nut at the bottom of the wheel assembly.
6. Remove the axle nut (castle nut and cotter pin). Move aside the now loose plastic former on the left side of the bike and remove the axle from that side. You will need to hold the castle nut while loosening the axle.

7. Place the motorcycle jack under the swing arm or chassis tubes to stabilize the rear end. Lift the motorcycle until the rear tire is just off the ground.
8. Remove the axle. When you remove the axle, the spacer under the left side cover will probably fall out.
9. Remove the three cap nuts (left side) and use a screwdriver to gently pry the wheel from the splined drive gear and place the wheel assembly on the ground.
10. Pull the wheel assembly rearward.


Reverse the process to replace the wheel.
Check the level of the final drive oil and fill as needed with SAE90 hypoid gear oil with a GL-5 rating. While you have everything apart, you should also check the brake pads and wheel bearings for wear and replace if necessary. God Bless and good luck!

May 30, 2011 | 2004 Suzuki VS 800 Intruder

1 Answer

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.
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

Mar 22, 2011 | Yamaha YZ 125 Motorcycles

1 Answer

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.
Power Valves
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YAMAHA YZ125 Owner Service Manual
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http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Jan 23, 2011 | 2004 Yamaha YZ 125

1 Answer

What color piston does a stock 2004 yz 125 come with?? Im rebuilding my top end but theres different color oem pistons? whats the difference???


Hi, Mezacarlos for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. 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

Dec 18, 2010 | 2004 Yamaha YZ 125

1 Answer

Looking for torque specs. on yz125 yamaha 2004 top end rebuild


Hi, Spotteddog3 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.
http://freestylemtx.com/forum/showthread.php?t=25558
YZ125 Top End Rebuild
YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

May 14, 2010 | 2003 Yamaha YZ 125

2 Answers

My rm 125 isnt getn to the power band in 1st gear?


The following possibility for your problems are mention below kindly check
1. Check the Engine Acceleration 2. Clean the plug 3. Check for any blockage in silencer 4. Clean the carbonizer
Kindly rate my help++ Thank you

May 09, 2010 | 2004 Suzuki RM 125

1 Answer

Lacks power at end of gear, its like a old 4 stroke, no power band and just goes at a steady speed.


At the "end of gear" sounds like at red line on RPM. All engines jsut stop making power there. Look at your engines torque curve and you will see it flattens significantly at peak rpms. Shift sooner

Jul 14, 2009 | 2004 Honda CR 125 R

2 Answers

2004 jeep wrangler 2.4 litre 4 cylinder


check the ground wirea at the dipstick tube,remove them all,and bend the ends of the wire,look for weak or broken wires, i bought several 4 cyl jeep that had problems at shift, fall on their face < after the engine settled back in to place,so wires made contact> just a thot. the ground wires are small the engine moves,when shifting.

Jul 29, 2008 | 2004 Jeep Wrangler

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