Question about 2004 Yamaha YZ 250 F

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07 YZ250F. Had fiber plates of clutch fail and got "cork" out in the oil. No metal damage. I'd like to inspect and, if needed, clean the flat oil screen that is in the crank case. Is there any way to do this without splitting the cases ?

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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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YAMAHA YZ250F Owner Service Manual
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Posted on Aug 01, 2016


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Posted on Jan 02, 2017

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SOURCE: crack in my yz 125 2001 crank case

You know aluminum can be welded very successfully now, so best bet is to remove that case and take it in to a good welder..You can ry the quick fix (JB Weld) is what i recommend, but success is rare !....good luck to you my friend...Tim

Posted on May 10, 2009

  • 2559 Answers

SOURCE: I have a 1970 Yamaha XS650 that pops out of 1st gear.

No,You will need to split it to repair.

Posted on Jun 02, 2009

  • 3433 Answers

SOURCE: 1200 goldwing clutch slip

Six yrs, is a long time. You really should change the oil. Oil also breaks down like gasoline does. Wet clutches require an oil containing certan sdditives. Old or regular motor oil is not well tolerated. Make sure you have free play on the clutch lever., about 1/8 in. - good luck- Ned

Posted on Jun 21, 2009

  • 3567 Answers

SOURCE: how to remove a crank on yz 125 after engine

When you split the case (depending on how you split it) the crank will stay in the left case half or the right case half. Whichever doesn't matter. Just take a rubber mallet and knock it out of the half it is in. Now would be a good time to replace the outer bearing and seal behind the front sprocket. Also replace the shift shaft seal.

By the way, this may be helpful >
Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part and/or the notation "Not Available" is in the description, the part is not in stock.

Could you take a moment and rate my answer? Thanks!

Posted on Sep 23, 2009

  • 376 Answers

SOURCE: after installing new fiber and steel plates (seven

Did you adjust the clutch cable? Have you replaced the springs in the clutch baskit with new one?

Posted on Sep 29, 2009

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1 Answer

Hi I have a problem with the clutch Yamaha yz 450 "07" when motor warms up clutch disappears. where cool reappears i replaced all disks and still the same. thanks

The problem is likely to be with the lubricant used in the gearbox. I'll bet you have a synthetic oil or an oil with "Special" lubricants in the gearbox. Some of the synthetics can swell the cork on the clutch friction plates and some can shrink the cork. If swollen, the clutch will grab. If shrunk, the clutch slips. Some synthetics work okay. Below is diagram from a factory repair manual. Use a name brand 20w40 motor oil without any special additives. With a little luck the clutch plates will come back to life and another set of friction plates will not be needed. Please rate my answer. tombones49_87.gif

Apr 18, 2011 | Yamaha YZ 450 F Motorcycles

1 Answer

Cluch not woking everything outside is working so something inside not working

Remove the right side cover and check the operation of the side case clutch lever by looking at it from the inside. If it is operating freely and the cam on the arm that pushes the clutch release pin is not worn out, the problem would be the fiber friction clutch plates. Did someone use synthetic oil in the gear box? Oil with "Special" lubricants? These can shrink the cork on the plates and cause the clutch to slip. Some synthetics can swell the cork and cause the clutch to grab and not disengage. If swelling or shrinkage of the plates has happened then the repair is to install new plates. Potentially, grooves may be worn in the inner and/or outer clutch hubs. This would prevent proper operation of the clutch. The repair there is new clutch inner hub (if worn), or clutch outer hub as needed. A worn needle bearing could also be the cause if the clutch will not disengage. Please post a reply if any more info is needed. An exploded view of your clutch can be seen at the website below. Please take a moment and rate my answer.

Apr 03, 2011 | 2003 kawasaki KX 125

1 Answer

I have a 2004 yz250f. I bought it used after not riding for many years. I had to adjust the clutch so tight because the bike would jump or stall when I put it in gear. The clutch is obviously worn, whats...

First of all if the bike sat for years the plates may just be stuck together. Disassemble and inspect the clutch. For racing some clutches are all aluminum plates. To last longer two or three plates may be metal. Some people put in all metal because they do not race and that set up will last longer. Aluminum plates are soft for better clutch grab. Aluminum plates tend to wear out faster than the the friction plates. So when you inspect the plates figure on replacing all the aluminum's , your friction's and metal's are probably fine.

Sep 22, 2010 | 2004 Yamaha YZ 250 F

1 Answer

How do you replace the pressure plates in the clutch,i have a shop manual but its not very user friendly or there a scematic i can down load. also i need to replace the cam tentioner any...

A clutch has metal pressure plates and fiber friction plates. Unless warped, the metal plates should be fine. The cork on the fiber friction plates can get worn and need replacing. The cork on the 1st and last friction plates is about .010 thicker than the center plates. Install a friction plate then metal, friction, metal, etc.. Be sure to install all parts in the proper sequence.

I don't know which part of the tensioner you will be replacing, just don't drop anything into the gearbox. Please rate my answer. Thanks.


Aug 15, 2010 | 2001 kawasaki ZR-7 S

1 Answer

I'm after a diagram for installing the clutch inside the engine

Go to the folowing website and you can see a diagram of the clutch. Follow the diagram for installation sequence. You didn't say exactly what year, model and cc your bike is, but clutches have the 1st and last plate as a fiber friction disk. So the secquence is fiber friction plate, metal pressure plate, fiber, metal, fiber, etc.. Sometimes the 1st and last friction plates are 5 to 10 thousandths thicker at the cork surface than the rest of the friction disks. Please rate my answer. Thanks.

Aug 14, 2010 | Honda CBR 1000 RR Fireblade Motorcycles

1 Answer


Is there oil in the gearbox? Is it really dirty? Lack of oil and dirty oil could account for the clutch problem. If you have put synthetic lubricant in the gearbox that could also account for the clutch. Synthetics can swell the cork on the clutch plates. New fiber plates would be needed.

The shifting problem could be tied to the lack of oil or dirty oil but usually the problem is bent shift forks. If fresh oil doesn't fix the clutch the clutch will need to be inspected/repaired. If that doesn't also fix the shifting, ( and I don't think it will ), the engine will need to be torn down and the shift mechanism inspected. Forks will likely need to be replaced.

Jul 15, 2010 | 2008 Yamaha Yamaha G5

1 Answer

Clutch problems

Are you using synthetic oil or an oil with " Special " additives? Synthetics and additives can swell the cork on the fiber plates and cause the problem. Extremely dirty oil can cause the clutch to drag also. Check to be certain the clutch plates and other components were re-assembled in the proper secquence. The first and the last plate should be fiber. If the above has no merit in solving the problem, go to the dealer and have them adjust the clutch. Put the bike in gear when at idle, not while the engine is revving.

May 23, 2010 | 2001 Yamaha YZ 426 F

1 Answer

Clutch not disengaging when clutch lever is depressed.

Assuming the clutch cable is intact and adjusted properly at the handlebars, the normal things that would cause the clutch to fail to disengage are extremely dirty oil or that synthetic lubricant has been used in the gearbox instead of 10w40 motor oil. Synthetics can cause the cork on the fiber clutch plates to swell. This causes the clutch to stay engaged. Extremely dirty oil can also cause the clutch to fail to disengage. If the oil is dirty, change it then ride for 30 minutes and change it again to flush out the grit. Please rate my answer. Thanks.

Feb 16, 2010 | 2004 Yamaha YZ 250

3 Answers

My clutch in my rm 250 wont disengage i know the pressure plate is moving but it still wont disengage?

If you put synthetic oil or an oil with "Special" additives in the gearbox the cork on the fiber friction plates may be swollen. The swelling can cause the clutch to stay engaged, Only use standard 10w40 motor oil in the gearbox. You will need new fiber friction plates if that is what has happened. Normally the only other three things that would cause the problem are a worn shift arm, a bent push rod and a badly worn cable.


Oct 18, 2009 | 2003 Suzuki RM 250

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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