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Gearcase bearing confusion

  • DT Tim
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Gearcase bearing confusion was created by DT Tim

DT400C. The bearing carrying the clutch shaft (6205Z) has a seal on one side but not the other, looking at bearing suppliers, the new ones come with seals on both sides, do I Just pop the one side out?
Seems strange but it has the seal in the pictures in my manual but can't find a pic of the other side.

  
 
17 Feb 2021 07:31 #1

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Replied by MarkT on topic Gearcase bearing confusion

You want a shielded bearing...  not a sealed one.  (Shield code suffix is usually "Z", sealed bearing code is usually "S" or "RS")

Shield goes to outside like your picture...  yes, just pop the inside shield out if you get a 2Z
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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17 Feb 2021 08:50 #2

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  • DT Tim
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Replied by DT Tim on topic Gearcase bearing confusion

Thanks MarkT,  yes I've located the right bearing but having to pop the one side out threw me, is this the norm, why not just have an open bearing?
17 Feb 2021 09:29 #3

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Replied by MarkT on topic Gearcase bearing confusion

According to Yamaha literature I've read, it must have a shield and that shield must be on the outside (clutch) side or the bearing could starve for oil. 
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
17 Feb 2021 12:36 #4

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Replied by DT Tim on topic Gearcase bearing confusion

Plus, just for info, the other Bearing 6305 N, 6305 NR is the same but just has the snap ring pre fitted.
18 Feb 2021 02:09 #5

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Replied by MarkT on topic Gearcase bearing confusion

The output shaft bearing 6305 is a 6305XN on that model...  the X designates a special radius on the back side which is important to have so it presses into the case all the way.

 

 
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
18 Feb 2021 07:21 #6

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Replied by DT Tim on topic Gearcase bearing confusion

O shoot, really?  It didn't have that bearing in, just a 6305N, and I've gone and ordered one too.
18 Feb 2021 14:15 #7

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Replied by Maltese on topic Gearcase bearing confusion

Hi all, 
Seems like I've got the same problem, ordered the correct (listed) bearing for a CT2 but it's come with a cover on both sides, the current only has a cover on one. How do I pop one side out without damaging the whole bearing? Also, if its listed as the one (yamaha part number) I need is there any real harm in just using it? 
23 Feb 2021 11:12 #8

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Replied by DT Tim on topic Gearcase bearing confusion


I ordered mine from the number on my existing and chose SKF as my brand of choice, and it came with just one side sealed.
   
05 Mar 2021 10:49 #9

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