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#2709265 - 08/08/12 09:58 PM Dirt Bike Rod bearing seizure (pics)
jamesm113 Offline


Registered: 05/20/11
Posts: 18
Loc: CA
My 2001 Yamaha WR250F's rod bearing seized on me. I barely put 4 hours of use on it before it seized. The oil level was halfway between the hash marks. Anyway, I was hoping someone could identify what caused it to seize. I had someone press it apart. The needle bearing shattered into pieces.




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#2709273 - 08/08/12 10:03 PM Re: Dirt Bike Rod bearing seizure (pics) [Re: jamesm113]
jsnyder49090 Offline


Registered: 05/31/12
Posts: 346
Loc: south haven mi
What do you mean it only had 4 hrs on it?
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#2709296 - 08/08/12 10:27 PM Re: Dirt Bike Rod bearing seizure (pics) [Re: jsnyder49090]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 1694
Loc: Houston, Texas
improper assembly most likely.
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2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#2709310 - 08/08/12 10:46 PM Re: Dirt Bike Rod bearing seizure (pics) [Re: jamesm113]
expat Offline


Registered: 05/12/09
Posts: 3838
Loc: Canada
Looks like it was dry.
Assembly lube?

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#2709314 - 08/08/12 10:52 PM Re: Dirt Bike Rod bearing seizure (pics) [Re: expat]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 1694
Loc: Houston, Texas
Those scratch marks almost looks like someone pounded the wrist pin on there without any lube. Unless that was you that did that removing it.
_________________________
2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#2709430 - 08/09/12 07:07 AM Re: Dirt Bike Rod bearing seizure (pics) [Re: jamesm113]
sunruh Offline


Registered: 06/28/05
Posts: 1631
Loc: Cedar Park, TX
you are funny

the wr250f does not have a needle bearing around the wrist pin.

and a 2001 that is 11+ years old with only 4 hrs. right, was it in a museum?
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#2709488 - 08/09/12 07:56 AM Re: Dirt Bike Rod bearing seizure (pics) [Re: motor_oil_madman]
AVB Offline


Registered: 05/20/12
Posts: 789
Loc: Georgia
Originally Posted By: motor_oil_madman
improper assembly most likely.


Thats what I am thinking, probably had a broken roller from the start.

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#2709841 - 08/09/12 03:00 PM Re: Dirt Bike Rod bearing seizure (pics) [Re: jamesm113]
Errtt Offline


Registered: 11/14/10
Posts: 2143
Loc: California
Just curious... what oil was being used?

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#2710061 - 08/09/12 06:44 PM Re: Dirt Bike Rod bearing seizure (pics) [Re: jamesm113]
jamesm113 Offline


Registered: 05/20/11
Posts: 18
Loc: CA
Sorry I wasn't clear: I bought it used and I put 4 hours of light use on it before it seized on me.

I don't know what oil was in it, I was going to change it after that ride.

I think the scratches are from removal, but am not sure.

There is a needle bearing for the crank pin, which is pictured (not the wrist pin.. the wrist pin was fine, and like someone mentioned, has no needle bearing)


Edited by jamesm113 (08/09/12 06:46 PM)

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#2710235 - 08/09/12 10:00 PM Re: Dirt Bike Rod bearing seizure (pics) [Re: jamesm113]
jamesm113 Offline


Registered: 05/20/11
Posts: 18
Loc: CA
A picture of some of the other parts and the shattered needle bearing:


Edited by jamesm113 (08/09/12 10:02 PM)

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#2710453 - 08/10/12 08:32 AM Re: Dirt Bike Rod bearing seizure (pics) [Re: jamesm113]
sunruh Offline


Registered: 06/28/05
Posts: 1631
Loc: Cedar Park, TX
yes that can happen on the crank pin, not on the rod.

how plugged was the oil pump screen?

replace it with another oem crank.

doesnt take much oil to keep that bearing alive. so you have/had
an issue somewhere else.

ah now my memory comes back, dang been a long time since i've seen this. this must be a last run of 01 bikes. because this issue showed up on the early 02s.

the oil hole in the crank pin wasnt lined up and so it starved the crank pin. known issue on early 02s.

steve
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#2710605 - 08/10/12 10:59 AM Re: Dirt Bike Rod bearing seizure (pics) [Re: sunruh]
jamesm113 Offline


Registered: 05/20/11
Posts: 18
Loc: CA
Oil pump screen was not clogged at all. In fact it was almost perfectly clean. Oil filter had a good amount of metal shavings in it, but it wasn't clogged.

Top end was in good shape, but I replaced the piston and rings anyway.

I've replaced it with a brand new OEM crank (had a superseded part no) and also gave it a new OEM oil pump (which also had a superseded part number). I've also replaced the main bearings, countershaft bearings, and all transmission bearings.

Now I'm worried this will happen again frown

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#2710734 - 08/10/12 12:59 PM Re: Dirt Bike Rod bearing seizure (pics) [Re: jamesm113]
sunruh Offline


Registered: 06/28/05
Posts: 1631
Loc: Cedar Park, TX
1st off let me say that it was a very limited number of motors that had that issue.

2nd, your bike is 11 years old. yamaha isnt even required to make parts for it.

that motor is designed just like an F1 motor. how many of those are around after 11+ years? or even 2.
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motorcycle oil myth buster

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#2710903 - 08/10/12 04:22 PM Re: Dirt Bike Rod bearing seizure (pics) [Re: jamesm113]
Cujet Offline


Registered: 02/15/03
Posts: 4185
Loc: Jupiter, Florida
That was a known issue with your bike. Put the new parts in and enjoy it. Make sure your valves are in good shape too. Dropping a valve will ruin your day.
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#2714564 - 08/14/12 04:05 PM Re: Dirt Bike Rod bearing seizure (pics) [Re: jamesm113]
jamesm113 Offline


Registered: 05/20/11
Posts: 18
Loc: CA
Cool, and the new crank has the hole lined up properly, I imagine?

Just wanted to make sure I (or the previous owner) wasn't doing anything wrong.

Thanks everyone

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