Mystery Bearing

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1/15/2019 5:13 PM

Hi All,
I’m in the process of doing a restoration on a 1991 CR80. It’s been more than a year since I tore the engine down and removed all of the bearings from the bottom end. I purchased a hotrods transmission bearing kit but it does not include a properly sized bearing for the below location:

I’ve tried to research online and look at OEM transmission diagrams but cannot seem to find any info on the proper bearing. I believe this is for the one side of the shift drum. I don’t know why the bearing kit would have included a bearing for one side of the shift drum but not the other. I can’t seem to find an OEM part number for the bearing either. Any help would be greatly appreciated.

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1/15/2019 6:31 PM
Edited Date/Time: 1/15/2019 6:33 PM

labbe001 wrote:

Hi All,
I’m in the process of doing a restoration on a 1991 CR80. It’s been more than a year since I tore the engine down and removed all of the bearings from the bottom end. I purchased a hotrods transmission bearing kit but it does not include a properly sized bearing for the below location:

I’ve tried to research online and look at OEM transmission diagrams but cannot seem to find any info on the proper bearing. I believe this is for the one side of the shift drum. I don’t know why the bearing kit would have included a bearing for one side of the shift drum but not the other. I can’t seem to find an OEM part number for the bearing either. Any help would be greatly appreciated.

that is odd. can you read the number on the bearing and post it?

is it a different size then the one on the other side of the shift drum?

.

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1/15/2019 6:54 PM

labbe001 wrote:

Hi All,
I’m in the process of doing a restoration on a 1991 CR80. It’s been more than a year since I tore the engine down and removed all of the bearings from the bottom end. I purchased a hotrods transmission bearing kit but it does not include a properly sized bearing for the below location:

I’ve tried to research online and look at OEM transmission diagrams but cannot seem to find any info on the proper bearing. I believe this is for the one side of the shift drum. I don’t know why the bearing kit would have included a bearing for one side of the shift drum but not the other. I can’t seem to find an OEM part number for the bearing either. Any help would be greatly appreciated.

barnett468 wrote:

that is odd. can you read the number on the bearing and post it?

is it a different size then the one on the other side of the shift drum?

.

I no longer have the old bearing. I measured both sides of the shift drum and both measure the same. So the inside diameter would be the same as the bearing in the other (right side). The interesting thing is when I read the description for the bearing kit it states it includes the special needle bearing for the shift drum. However, the only bearing that fits the shift drum isn’t a needle bearing...and it’s just the one bearing that fits into the right side crankcase.
https://www.denniskirk.com/hot-rods/transmission-bearing-kit-tbk0083.p110742.prd/110742.sku

Furthermore, I looked on eBay at crankcases for reference pics just to make sure I’m not crazy. Sure enough, there is a needle bearing that’s supposed to go into the left case. But I still cannot find a kit that includes this bearing nor can I find it on an OEM fiche.

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1/15/2019 7:35 PM

labbe001 wrote:

Hi All,
I’m in the process of doing a restoration on a 1991 CR80. It’s been more than a year since I tore the engine down and removed all of the bearings from the bottom end. I purchased a hotrods transmission bearing kit but it does not include a properly sized bearing for the below location:

I’ve tried to research online and look at OEM transmission diagrams but cannot seem to find any info on the proper bearing. I believe this is for the one side of the shift drum. I don’t know why the bearing kit would have included a bearing for one side of the shift drum but not the other. I can’t seem to find an OEM part number for the bearing either. Any help would be greatly appreciated.

barnett468 wrote:

that is odd. can you read the number on the bearing and post it?

is it a different size then the one on the other side of the shift drum?

.

ok, it is not on the parts fiche because it is not sold separately. it comes with the shift drum, however, you can buy one if you can find the size. these people below show it in their ad so maybe you can call and see if they will sell it separately or give you the numbers off of it.

https://www.btosports.com/p/hot-rods-transmission-bearring-kits-honda/option/421-3083?utm_source=google&utm_medium=cpc&utm_campaign=gs_allproducts&utm_content=66398753244&utm_term=&matchtype=&adposition=1o4&device=c&adtype=pla&product_id=421-3083&product_country=US&gclid=Cj0KCQiApvbhBRDXARIsALnNoK0Hgn7UExrxRVFz4Jajn58D8ZTFqTBIiTcHs8VhCN3MkZdYMPWS_esaApgCEALw_wcB

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1/15/2019 7:47 PM

Usually that bearing shows up either in the crank case section or transmission section of microfishe...I just checked, it does not show up for your model...that is a special thin needle bearing for that end of the shift drum...may have to visit a Honda dealer for that one...I always save my old bearings for just this instance.... My 89 kx250 has a special bearing on the main/sprocket shaft....NLA from Kawasaki & not availible from any bearing house that I could find...good thing I kept it!

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1/15/2019 7:59 PM

sandman768 wrote:

Usually that bearing shows up either in the crank case section or transmission section of microfishe...I just checked, it does not show up for your model...that is a special thin needle bearing for that end of the shift drum...may have to visit a Honda dealer for that one...I always save my old bearings for just this instance.... My 89 kx250 has a special bearing on the main/sprocket shaft....NLA from Kawasaki & not availible from any bearing house that I could find...good thing I kept it!

"ok, it is not on the parts fiche because it is not sold separately. it comes with the shift drum, however, you can buy one if you can find the size. these people below show it in their ad so maybe you can call and see if they will sell it separately or give you the numbers off of it."

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1/15/2019 8:12 PM

what is the ID OD and Depth?

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1/16/2019 11:49 AM
Edited Date/Time: 1/16/2019 10:19 PM

Funny thing is everyone who sells the Hot Rods bearing kit TBK0083 says it includes the drum needle bearing but none of the pictures show such bearing. If it were me I would call Hot Rods Inc. and ask them to verify whether it's included or not.

Or, go to a dealer and find a Honda repair manual and see if it shows the bearing. If that doesn't work maybe email one of the guys selling the cases (there are a few) on Ebay and ask if they can tell you what the bearing numbers are provided they are facing outward.

Hard to believe the shift drum was the same for so many years and no where on the internet that bearing number exists.

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2018 KX450F
2005 KX250
2003 KDX 220
1984 KX 80
1982 RM 80
1980 RM 80
1977 XR 75
1969 Honda Mini 50

10/8/2019 9:32 PM

So I’m in the same situation that you’re in with my 06 cr85. Can’t find the drum needle bearing anywhere. Did you end up finding it and if so tell me the location of the holy grail please. It’s the only thing holding our rebuild up.

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10/8/2019 10:14 PM

labbe001 wrote:

Hi All,
I’m in the process of doing a restoration on a 1991 CR80. It’s been more than a year since I tore the engine down and removed all of the bearings from the bottom end. I purchased a hotrods transmission bearing kit but it does not include a properly sized bearing for the below location:

I’ve tried to research online and look at OEM transmission diagrams but cannot seem to find any info on the proper bearing. I believe this is for the one side of the shift drum. I don’t know why the bearing kit would have included a bearing for one side of the shift drum but not the other. I can’t seem to find an OEM part number for the bearing either. Any help would be greatly appreciated.

Buy this part number: 91022-GC4-601 from Honda. It's found in the older CR80 parts fiche....look at the crankcase fiche, it'll be item number 13. For whatever reason, Honda stopped listing the part by itself. The cases and shift drum are the same part numbers from 1986 through 1995 at least, and they take the same bearing. I know this because several years ago, I did a 1995 CR80 for my daughters and I ran into the same problem

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Many thanks to everyone helping me out this GNCC season: SRT Offroad, Acerbis, FCR Suspension, O'Neal Racing, Evans Waterless Coolants, Rekluse, Twin Air, Braking Brakes, Carbsport

10/8/2019 10:19 PM

For the record this part number bearing measures 25mm ID, 30mm OD, and it's 8mm tall

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Many thanks to everyone helping me out this GNCC season: SRT Offroad, Acerbis, FCR Suspension, O'Neal Racing, Evans Waterless Coolants, Rekluse, Twin Air, Braking Brakes, Carbsport

10/9/2019 6:55 AM

Thanks Hare. You’re the first person able to offer an actual part number that’s even close for our bike. I’m still not sure it’s the same for my newer 85 though. A lot of stuff remained the same for the bikes and it’s cheap enough I might just order it to try it.

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10/10/2019 9:43 AM
Edited Date/Time: 10/10/2019 9:49 PM

hothotlena wrote:

Thanks Hare. You’re the first person able to offer an actual part number that’s even close for our bike. I’m still not sure it’s the same for my newer 85 though. A lot of stuff remained the same for the bikes and it’s cheap enough I might just order it to try it.

Not sure either. That's why I provided the dimensions of the bearing. Prior to ordering, you should measure the OD and height of the shift drum, and the ID of the bearing bore in the case. I'd bet the bearing is the same....the part number for the 1986 CR80 shift drum (where I got the bearing info) is the same as the shift drum for the 2006 CR85. Best of luck

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Many thanks to everyone helping me out this GNCC season: SRT Offroad, Acerbis, FCR Suspension, O'Neal Racing, Evans Waterless Coolants, Rekluse, Twin Air, Braking Brakes, Carbsport

2/20/2020 9:35 PM

Hey all , so I'm in the same situation with my 99 cr80. Honda told Me that it is vintage and they do not carry.. only shows older 80s models are the ones that use it!. Very weird no one has a clue where to find this bearing including myself.. I went as far as ordering it from a bike shop in Ireland, just to find out they refunded me because manufacture doesnt supply them anymore!

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2/21/2020 7:27 PM

1986-2004 had the same shift drum so I would assume it's the same bearing (91022-GC4-601). Honda says it's no longer available but a seller on Ebay says they have 7 available. Search the above P/N on Ebay.

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2018 KX450F
2005 KX250
2003 KDX 220
1984 KX 80
1982 RM 80
1980 RM 80
1977 XR 75
1969 Honda Mini 50