Question about 2005 Yamaha yZ 125

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My yz 125 doesn't leak oil but nothing pours from the check screw after riding

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  • Yamaha Master
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Hi, Anonymous 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.
Dirt Rider Magazine
06 YZ125 Transmission Oil Level Yamaha 2 Stroke
YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Posted on Jul 16, 2016

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Posted on Jan 02, 2017

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SOURCE: yamaha yz 125 2001.water leak

Yes, the water seal is leaking. This is the indicator hole for the water and oil seal.
Enjoy the ride !

Jon

Posted on Mar 01, 2009

  • 3567 Answers

SOURCE: while riding my yz 125 it just died and won,t kick up again

  • If a hole in the piston then install new piston and rings. Next, clean the carbon off the head and install a new head gasket.
  • If cylinder wall is scared the piston has seized up. Pull the cylinder off and take it to the dealer. Have them bore the cylinder and return it along with a new oversize piston and rings.
  • While at the parts counter, get a new stock spark plug and a supply of Yamalube Two Stroke Motor Oil. You need to add 4 ounces per gallon when filling up. This will be a 32/1 gas to oil ratio. NEVER ride the bike without at least the needed 32/1 mix.
Please rate the solution as a "FixYa" if able. Thanks!

Posted on Mar 23, 2009

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SOURCE: what oil should i have in yz 125 2 stroke

The clutch and gearbox share the same oil. The oil for the motor is 10w40. Stick with the major brands; Pennzoil, Quaker State, Mobil, Yamalube or Shell.

Posted on Apr 19, 2009

  • 17 Answers

SOURCE: YZ 125 04 GEARBOX OIL

Should be about 650ml, isnt it stamped on the casing somewhere?

Posted on Jun 17, 2009

mxtras
  • 194 Answers

SOURCE: What are the specs for fork oil in a 99 YZ 125

Use a good quality 5Wt suspension oil (or 7Wt if you want more dampening but this will make it a little more stiff through the small stuff). With the springs removed, fill the forks to the top, cycle the damper rod up and down until it has consistant and firm resistance, top the fluid off to the top, lift the outer tube up about 6" then set it back down, top off, then let it sit until you see no more bubbles. Stroke the damper rod again to ensure there is no air and then **** out fluid until your level is between 110 and 150MM in each tube. Make sure each tube is filled to the same level. One quart per fork is enough to do the job but you might need three quarts to have both filled prior to sucking the excess back out. I usually start with three bottles.

For a firmer feel, use more oil (110MM). For a softer feel, use less fluid (150MM). This is measured from the top of each tube to the level of the oil. Just use a piece of clear tubing and an irrigation syringe - you can get one from a local animal vet. Just mark the tubing with a sharpie at the level you desire.

My standard setting was 135MM from the top using 7Wt oil. I am 160lbs and a mid pack A class rider using essentially stock valving with stock springs.

Posted on Jan 25, 2010

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1 Answer

Oil leaking out of overflow on 2000 yz 125 while running


Oil level to high is what I'd check first.

Hope that helps, good luck.

Les

Oct 30, 2013 | 2004 Yamaha YZ 250 F

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.
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Feb 06, 2013 | 2003 Yamaha YZ 125

1 Answer

Leaking oil from power valve on 2000 yz 125


It is normal for the powervalves to leak, but it does depend on where it is leaking from.

The hose on the left side is the power valve chamber vent - it is normal for it to leak thick black oil from this hose.

If the leak is on the right side, and the oil is transmission fluid, then the seal on the actuator shaft needs to be replaced.

Excessive oil from the powervalve hose is a possible sign that the compression is low. Low compression equals lower exhaust temperatures and this can lead to incomplete combustion.

Jan 27, 2010 | 2004 Yamaha YZ 125

1 Answer

Yz 125 bog


Sounds too lean to me or lacking fuel.

Partially blocked jet in carb. May have to remove / clean.

Check also that carb butterfly / piston is travelling to full open position.

Dec 21, 2009 | 2003 Yamaha YZ 125

1 Answer

I have a yz 125 with a rebuilt motor i put the nuw motor


A very common problem with wet clutches is that many folks do not use the correct oil. The plates in the clutch are sandwiched under spring pressure and there is nothing in the mechanism to release them, so if the oil creates too much "stiction" then the plates can become suctioned together.

I suggest first trying an oil change using an oil designed for use with wet clutches. Then, get a running start, hop on the bike and drop it into gear. Then pull in the clutch and while holding the clutch lever in, rev the motor to break the plates loose. If this fails after a few attempts, your plates could be rusted together - possibly from a leaking waterpump seal or a ride through deep water. A simple tear-down of the clutch will tell the tale and this can be done without buying any parts if you are careful.

Nov 08, 2009 | 2003 Yamaha YZ 125

1 Answer

2003 yz 125 clutch


This sounds like dirt and grit in the oil is causing the clutch to grab. Change the gearbox oil. Ride the bike for a couple of hours using the clutch often. Now drain the oil again and put in fresh oil. This will flush out the dirt and grit. Use 10w40 motor oil. Stick with the major brands; Pennzoil, Quaker State, Mobil or Shell. Do not use synthetics or oils with "special" additives.

Other possible causes are > a need to adjust the clutch lever for 1/4" free play at end of the lever > warped clutch plates or friction plates > Clutch has been worked on and assembled wrong > low oil level in the gearbox > frozen clutch hub bearing > Incorrect clutch cable being used.

Please post a comment after the double oil change. The 2x oil change is a cheap way to eliminate a possible cause and hey, it isn't gonna hurt anything. If you still have the problem I can help with a clutch rebuild.

Jun 04, 2009 | 2003 Yamaha YZ 125

1 Answer

1997 yamah yz 125 lots of white smoke comeing out of pipe


How much was it smoking previously? Too much smoke (oil) is a whole lot better than not enough smoke (oil). If you are mixing the oil and gas then cut back on the mixture. Obviously it is out of balance. Put 1/2 gallon of raw gas in the tank to cut the mix. After a tank or so you should get the balance back.

You need a new shift shaft and probably need a new shift lever due to the bad splines. You can try the JB Weld but I suggest that you go ahead and drill the lever an shaft then put in a cold roll split pin from the hardware store. You have nothing to loose since the shaft and the lever are already toast.

Please rate this solution. Thanks!

May 01, 2009 | 2003 Yamaha YZ 125

1 Answer

Putting wrong transmition oil in yz 125


Nothing significant, don't worry about it. You do NOT want oil marked EC, signifying energy conservation. Such oil will cause the clutch plates to slip and premature clutch wear. If the oil you put in does say EC on the small round type seal simply drain it out and put in the correct oil. Not critical but the sooner the better.

Apr 19, 2009 | 2003 Yamaha YZ 125

3 Answers

Oil is a grey colour in the engine of my yz 125 2001


Your bike is water cooled. Some of that water is leaking into the gear box. The cylinder gasket is the likely leak. I would let the shop take a look at it instead of trying to fix it yourself.

But be sure there is not an external source for the water. Do you wash the bike often? Ride the creek bed often? Leave the bike where the lawn sprinkler gets the bike wet? Leave it out in the rain? Change the oil and keep the bike dry. If the problem comes back then go see the dealer.

Mar 19, 2009 | 2003 Yamaha YZ 125

2 Answers

Yamaha yz 125 2001.water leak


Yes, the water seal is leaking. This is the indicator hole for the water and oil seal.
Enjoy the ride !

Jon

Mar 01, 2009 | 2003 Yamaha YZ 125

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