Question about Yamaha YZ 125 Motorcycles

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Water leak/mixing with oil

Water is leaking past the gear selector shaft on my 1987 yz 125 also the water is mixing with the gearbox oil i have drained the gearbox and the oil is milky any help with this would be great thanx heaps Gaz

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  • gazzman79 Mar 10, 2009

    thanks for the info i was stumped on where to start. thanks again

  • Anonymous Mar 31, 2014

    the oil keeps leaking throughout the time in drops. i want to stop it.

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The gasket on the gear shaft is dead. Water runs around it between the outer cover and the gearbox, and unfortunately the gear shaft needs to go all the way through them to get to the 'box. There should be a flat O-shaped gasket around the shaft, and that's leaking water into the oil, and out the side. This is a pretty tough job if you havn't got the right tools, so maybe rather take it to a workshop mate! Hope that helps!

Posted on Mar 10, 2009

  • csurage Feb 04, 2011

    wowwww... i got the same problem

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1 Answer

I'm getting fuel in the crankcase oil of my 1994 YZ 125


Unless I am mistaken, (Honda guy myself, not fully up to date on mid to late 90's Yamaha) it is a 2 stroke so fuel air mix runs through the crankcase anyway but, excessive amounts are usually caused by a stuck needle valve in the carb. If it is getting into the gearbox oil then you probably have a bad crank shaft seal which requires major surgery.

Good luck hope this helps.

Mar 26, 2010 | 2003 Yamaha YZ 125

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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

Engine problem


Water coming out of the hole is to indicate that the pump seals need to be replaced. Some water is probably in the gearbox now. If the oil is whiteish you do. Pull the right case cover then remove the pump cover and the impeller then replace the seals. Remove the liquid gasket so that the hole is open again. You can see a parts diagram at www.babbittsonline.com Click on the red "OEM PARTS" tab. Items 6 and 7 are the seals separating the water from the oil. Put a wrench on the impeller shaft next to the gear, then unscrew the impeller as if it were a screw. It would be good to replace the gasket (item 10) as well. Please take a moment and rate my answer to your problem.

Jan 03, 2010 | 2003 Yamaha YZ 125

1 Answer

What is the easiest way to change my shifter shaft on a 1999 yz 125... i put that my bike was a 2003 because they didnt have the option of a 1999...


Remove gearlever,drain gearbox oil,drain coolant,remove powervalve actuator cover,place small allen key in slot provided & remove bolt on actuator,remove radiator to waterpump hoses,remove clutch cover,slide shaft out from left to right,(If clutch hub is in the way remove clutch assembly),fit new shaft ,reassemble,replace gearbox oil & coolant & bobs ya uncle.

Nov 16, 2009 | 2003 Yamaha YZ 125

1 Answer

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May 09, 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

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

1 Answer

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water pump / inner,seal needs looking into .

Mar 10, 2009 | 2002 Yamaha YZ 426 F

1 Answer

Water leak/mixing with oil


change the seal behind the water pump impeller
the shifter shaft seal will stop leaking
if it continues to mix water and oil you will have to change the head gasket

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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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