Question about 2002 Yamaha YZ 426 F

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Water leak hi i have a prob with water leaking out past the gear selector shaft on my 1987 yz 125 also the water is mixing with gearbox oil i have drained gearbox and oil is milky where do i start or what are my options thanx Gaz

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Water pump / inner,seal needs looking into .

Posted on Mar 11, 2009

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83 yz 125 was shifting okay. Drained oil, replaced with new clutch oil. Shifts into first, won't shift into other gears at all.


Hi Arron by any chance did you loose a spring and a ball bearing or plunger when you opened the sump plug??? Some bikes have one drain plug some have what looks like a drain plug but with a plunger to hold the selector drum in neutral. Check the container you drained your oil into you might get lucky. Regards Jim...

May 16, 2015 | Motorcycles

1 Answer

I have a 06 yz250f that will not go into gear and when it does it seams that it skipping sounds like its in between gears and when it gose into gear and iam in top gear it goes and it seams to have a pause...


Sounds like a selector rod has bent in the gearbox and the damage has got progressively worse by damaging the teeth on various gears. Drain the gearbox oil into a suitable container and look for any signs of metal particles or broken gear teeth. Firstly if you are not mechanically minded or don't have a repair manual and suitable tools then this is a job for the bike shop. This can be a very expensive repair. It can be more economical to fit a known good secondhand replacement engine, best o luck.

Feb 11, 2013 | 2003 Yamaha YZ 125

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

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

Wont go in gear


almost certainly a bent selector fork

May 09, 2009 | 2003 Yamaha YZ 125

3 Answers

2001 yz125 grey milky tranmittion oil


stick your cok down the petrol hole

May 05, 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

Water leak/mixing with oil


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!

Mar 10, 2009 | Yamaha YZ 125 Motorcycles

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

Mar 10, 2009 | 2002 Yamaha YZ 426 F

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