Bearing parts in 14' YZ450 oil screen

Brand Yamaha Brand Peer Bearing

35 replies to this topic
  • jethro450

Posted May 28, 2016 - 10:58 AM

#1

Any ideas which bearing died?
ImageUploadedByThumper Talk1464461870.184468.jpg
ImageUploadedByThumper Talk1464461795.930128.jpg

  • grayracer513

Posted May 28, 2016 - 12:09 PM

#2

Left main shaft is my guess. If so, you should be able to move the clutch around quite a bit from under the outside cover.



  • jethro450

Posted May 28, 2016 - 12:20 PM

#3

I will check the clutch right now, good news is I found about 95% of the parts. Bad news is I have found 95% of the parts…

ImageUploadedByThumper Talk1464466769.791035.jpg

  • jethro450

Posted May 28, 2016 - 12:38 PM

#4

Clutch is tight

  • grayracer513

Posted May 29, 2016 - 06:14 AM

#5

Well then, you're going to have to pull it apart anyway.



  • 1snotrocket

Posted May 29, 2016 - 10:31 AM

#6

Looks like the old shift stopper wheel.If you never updated to the 2015 stopper.I stand corrected after looking at the second picture.That not a shift stopper cage.Looks like splitting the case time.

Edited by 1snotrocket, May 29, 2016 - 10:35 AM.


  • GHILL28

Posted May 29, 2016 - 12:27 PM

#7

Time to throw in a 2015 connecting rod and a WR 4th and 5th!



  • jethro450

Posted May 29, 2016 - 03:51 PM

#8

Well, I'm stumped. I can't find anything wrong or loose or out of place at all...

I've done my best to put the pieces of that bearing back together and can't find anything the same thickness where it could even fit.

I've searched the online engine break down diagrams and the only bearings I see are the ones in my bike!

I know this sounds pretty wacko, but you think some drunk jap dropped a random bearing during install?

This is the first time the side covers have ever been pulled.

Like I say, I'm scratching my head here....

ImageUploadedByThumper Talk1464565666.342955.jpg

Edited by jethro450, May 29, 2016 - 03:52 PM.


  • jethro450

Posted May 29, 2016 - 03:54 PM

#9

Time to throw in a 2015 connecting rod and a WR 4th and 5th!


I haven't read up on this but this is worth considering. Is the 15' rod better? Was there anything wrong with the 14' rod?

And would it be a straight swap of gears for 4th and 5th? Cause that intrigues me a lot!

But back to the point, where that crap did this crushed bearing come from??!!!!

  • TN Dirt Rider

Posted May 29, 2016 - 03:55 PM

#10

It's not a tranny bearing? Kinda looks like the right size but hard to tell from the pic.

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  • GHILL28

Posted May 29, 2016 - 03:57 PM

#11

I haven't read up on this but this is worth considering. Is the 15' rod better? Was there anything wrong with the 14' rod?

And would it be a straight swap of gears for 4th and 5th? Cause that intrigues me a lot!

But back to the point, where that crap did this crushed bearing come from??!!!!


Yes and yes.

  • jethro450

Posted May 29, 2016 - 04:04 PM

#12

Here's a picture of the bearings in the transmission with half of the outer race of that bearing sitting in there. My finger is pointing to the closest sized shaft that that bearing could fit, but the piece that fits in that is not a spinning piece, it just sits in there.

ImageUploadedByThumper Talk1464566639.070332.jpg

  • jethro450

Posted May 29, 2016 - 04:11 PM

#13

I think the part that really leads me towards thinking my crazy drunk Japanese mechanic theory is correct, is because there are four pieces of this bearing that are circular in shape that are a little bent, but not ripped in half. If a bearing fails on a shaft you would think parts of the bearing would be left on the shaft unless they were torn in half in order to get off of the shaft…

ImageUploadedByThumper Talk1464567077.614589.jpg

  • jethro450

Posted May 29, 2016 - 04:25 PM

#14

Riddle me this: If a bearing failed inside a motor and you found circular pieces of that bearing that were not ripped in half, would you not think that those circular pieces should still be loosely fit on the shaft that they were installed on? How did all the pieces get off the shaft without being torn in half?

Here's a pic of my theory
ImageUploadedByThumper Talk1464567919.576100.jpg

  • TN Dirt Rider

Posted May 29, 2016 - 04:28 PM

#15

Here's a picture of the bearings in the transmission with half of the outer race of that bearing sitting in there. My finger is pointing to the closest sized shaft that that bearing could fit, but the piece that fits in that is not a spinning piece, it just sits in there.

attachicon.gifImageUploadedByThumper Talk1464566639.070332.jpg


Heck I don't know. Where your finger is pointing is where the shafts for the shift forks ride, and no bearings on them.

  • jethro450

Posted May 29, 2016 - 04:37 PM

#16

Exactly, they're the closest sized shafts that would fit, but they aren't even a shaft that takes a bearing.

  • GHILL28

Posted May 29, 2016 - 04:44 PM

#17

Can you get a bearing diameter? How many hours on the bike? If Wang f'd it up, wouldn't that show up immediately?

  • TN Dirt Rider

Posted May 29, 2016 - 04:56 PM

#18

Show us a close up of that case half, but the front half where the crank bearing sits, all the way to front of case.

  • jethro450

Posted May 29, 2016 - 05:39 PM

#19

Guys, I'm putting the dang thing back together!

After studying the diagrams again and not even seeing a possibility, and inspecting all the parts in the garage and comparing to the diagrams, and the fact that there's full circular pieces of bearing left.... I just can't see how it came from something INSIDE the motor. It is very close, if not the exact same size as the bearing on the clutch actuating lever. But that bearing is there. Maybe I'll go pull it out and compare, but I think I'm good.

As for the gears and 15' rod, I'll do that some other time. Maybe put a good years worth of riding on it and do that next year.

Show us a close up of that case half, but the front half where the crank bearing sits, all the way to front of case.

Right side?

Edited by jethro450, May 29, 2016 - 05:39 PM.


  • jethro450

Posted May 29, 2016 - 05:53 PM

#20

ImageUploadedByThumper Talk1464573025.990016.jpg ImageUploadedByThumper Talk1464573060.822018.jpg ImageUploadedByThumper Talk1464573135.808933.jpg
I take back my comment about that bearing being closely related in size to the clutch actuator lever. The bearing on the clutch actuator lever uses long cylindrical Steeley's for bearings, not circular balls for the bearings.





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