Question about Yamaha YZ 125 Motorcycles

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On my 1997 yz 125 the clutch oil is out how do i put more in

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By the filler plug on right side casing number 1 on pic below add light gear oil budon my 1997 yz 125 the clutch oil is out how do i - eb71dc0.jpg

Posted on Oct 01, 2009

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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

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

Will main clutch casing fit yz 125 2001 from 1997?


Hey Ryan! Long time since hearing from you.

When you say "main clutch casing" do you mean the right side cover for the gearbox or do you mean the primary driven gear (AKA "clutch basket") that the clutch boss (AKA "clutch hub") and all the clutch plates fit into?

If you mean the right outer casing > they are slightly different, '97 pn 4JY-15431-10-00 and 2001 pn 4JY-15431-12-00. The entire clutch is the same from 1997 through 2001.

Jun 07, 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

What oil for yz 125?


I would use maxima mt 75w gear oil in all 2-stroke trans.

May 01, 2009 | 2003 Yamaha YZ 125

2 Answers

Diffrences betweein oils


your bike does not use tranny oil.only motor oil.your gears are lubricated by your motor oil as well as your clutch.it works by a sump system.I use yamahlube for my bike.

Apr 20, 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

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.

Apr 19, 2009 | 2003 Yamaha YZ 125

2 Answers

Yz 125 2001 stays in gear when clutch pulled in


Lose the Honda transmission oil. It may have swollen the cork on the friction plates. Go with 10w40 in the gearbox. Any major brand; Mobil, Shell, Quaker State, Pennzoil, etc.. Try the new oil and give the cork a week to shrink back down > if they will. You may need to put in a new set of plates.

Apr 17, 2009 | 2003 Yamaha YZ 125

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