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Discussion Starter · #1 ·
Hi everybody. I have the crankcase of a 07 400ex split and stripped of all parts. I ordered all new bearings and 2 of the bearings are not smooth at all. They are part #s 91006-hn1-a41 and 91004-hn1-a41. They are sealed on one side and goldish in color on the sealed side. They also have a different center than the others . Anyone that has been in there knows what i mean. They go to the transmission. Anyway, I ordered replacements and the second set does the same thing. The ones I took out of the case were smooth as glass. Only explanation I can think of is they were sitting in oil? I don't want to reuse the old ones. Do these sealed ones loosen up or something? Also, does it matter if the letters on the bearings face out when installed in the case? Thanks. I can clarify if needed
 

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Did these come from a dealer or a bearing supplier. I don't know your bike but my 08 420 doesn't have sealed bearings as they are oil bath. Sealed bearings normally are packed with grease and would have resistance


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Discussion Starter · #3 ·
They came from partzilla (hope its ok to say that). They definetely arent packed with grease.
i assume they shouldnt be and the oil willl lubricate them?

Did these come from a dealer or a bearing supplier. I don't know your bike but my 08 420 doesn't have sealed bearings as they are oil bath. Sealed bearings normally are packed with grease and would have resistance


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I had a similar issue with a starter shaft support bearing for my 350D. The small 6000 series bearing is pressed into the top of the starter reduction cover and supports the end of the starter drive gear/shaft.

The bearing I found in there was worn out, pitted and junk. I ordered a new OEM bearing and when I took it out of the package it felt like the balls in it had eight sides each... wasn't smooth at all. I looked in at the race and each ball with magnification and they all looked fine, so I washed it and blew it dry. Still felt the same... I was thinking its probably junk, like you are... So I oiled that new bearing with a few drops of fresh motor oil and then it felt just fine!

I think my issue is a cheap bearing and it will probably fail again someday. If I were you I would wash those new bearings in solvent, blow them out with compressed air and oil them. See if that makes them feel like good bearings...?
 

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Discussion Starter · #5 ·
Ok. Ill try that. And nevermind on the way the bearings face. I see in the manual where it says the letters face out. Thanks
 
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