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The 2-Stroke Garage => Turning Wrenches => Topic started by: 2t Fan on October 10, 2025, 02:51:31 AM

Title: Transmission bearings for 73' RD350
Post by: 2t Fan on October 10, 2025, 02:51:31 AM
Can anyone help me with the generic transmission bearing no.s for the air-cooled '73 RD350

Thanks
Title: Re: Transmission bearings for 73' RD350
Post by: quocle603 on October 10, 2025, 06:48:58 AM
https://www.partzilla.com/catalog/yamaha/motorcycle/1973/rd350/transmission

Which part????

Part 31?
Title: Re: Transmission bearings for 73' RD350
Post by: 1976RD400C on October 10, 2025, 08:01:43 AM
The bearing numbers are listed in the specs in the back of the service manual.
Title: Re: Transmission bearings for 73' RD350
Post by: 2t Fan on October 10, 2025, 09:12:17 AM
Quote from: quocle603 on October 10, 2025, 06:48:58 AMhttps://www.partzilla.com/catalog/yamaha/motorcycle/1973/rd350/transmission

Which part????

Part 31?
All the bearings inside the gearbox. I am looking at the numbers like "B6305N" etc
Title: Re: Transmission bearings for 73' RD350
Post by: 2t Fan on October 10, 2025, 09:13:02 AM
Quote from: 1976RD400C on October 10, 2025, 08:01:43 AMThe bearing numbers are listed in the specs in the back of the service manual.
ok thanks. Let me check it out
Title: Re: Transmission bearings for 73' RD350
Post by: SoCal250 on October 10, 2025, 12:51:41 PM
Wow #14 is an expensive one! When ordering make sure you get replacements with the correct features as some of these have circlip grooves in the OD, etc. The Partzilla diagram mentioned above has photos of the parts you can use for reference

#     PART NUMBER      DESCRIPTION
12   93311-22027-00   BEARING, CYLINDRICAL 20-30-15
14   93305-20502-00 (93305-20508-00)   BEARING B5205 Special 25-52-20.6
24   93310-22057-00   BEARING K20-24-10 S
27   93311-42045-00   BEARING, CYLINDRICAL 20NQ3315NE 20-33-15
31   93306-30504-00   BEARING B6305N
Title: Re: Transmission bearings for 73' RD350
Post by: 2t Fan on October 10, 2025, 03:02:41 PM
Quote from: SoCal250 on October 10, 2025, 12:51:41 PMWow #14 is an expensive one! When ordering make sure you get replacements with the correct features as some of these have circlip grooves in the OD, etc. The Partzilla diagram mentioned above has photos of the parts you can use for reference

#     PART NUMBER      DESCRIPTION
12   93311-22027-00   BEARING, CYLINDRICAL 20-30-15
14   93305-20502-00 (93305-20508-00)   BEARING B5205 Special 25-52-20.6
24   93310-22057-00   BEARING K20-24-10 S
27   93311-42045-00   BEARING, CYLINDRICAL 20NQ3315NE 20-33-15
31   93306-30504-00   BEARING B6305N
thanks SoCal250

Managed to find below , not sure if they are exact replacements

B6305N

20-33-15 -20NQ3315NE (Koyo)

20-24-10 -K20-24X10 S (Koyo)

B5205 Special

20-30-15 - RV203015-JTEKT (Koyo)
Title: Re: Transmission bearings for 73' RD350
Post by: SoCal250 on October 10, 2025, 03:32:26 PM
Koyo brand is Yamaha OE  :twocents:
Title: Re: Transmission bearings for 73' RD350
Post by: klaird on October 10, 2025, 06:56:49 PM
I replaced all of transmission bearings on 75 RD  last winter. Ordered from "Yamaha Parts Online" (babbitts) and the prices were very  reasonable $218 bucks for all of them, all OE.
Title: Re: Transmission bearings for 73' RD350
Post by: SoCal250 on October 11, 2025, 12:38:29 PM
It's a little more expensive these days

                             MSRP  Babbitts   Partzilla
93311-22027-00    $52.99  $41.33   $37.39
93305-20502-00    $125.99 $98.27   $92.92
93310-22057-00    $42.99  $33.53   $33.41
93311-42045-00    $32.15  $25.08   $26.31
93306-30504-00    $71.99  $56.15   $56.13
                TOTAL    $326.11  $254.36  $246.16
Title: Re: Transmission bearings for 73' RD350
Post by: 1976RD400C on October 12, 2025, 09:10:00 AM
Here's what Yambits sent for a RD400 countershaft ($20) and clutch shaft ($33) bearings.
Title: Re: Transmission bearings for 73' RD350
Post by: 2 Smoker on October 15, 2025, 03:28:29 PM
Quote from: SoCal250 on October 11, 2025, 12:38:29 PMIt's a little more expensive these days

                             MSRP  Babbitts   Partzilla
93311-22027-00    $52.99  $41.33   $37.39
93305-20502-00    $125.99 $98.27   $92.92
93310-22057-00    $42.99  $33.53   $33.41
93311-42045-00    $32.15  $25.08   $26.31
93306-30504-00    $71.99  $56.15   $56.13
                TOTAL    $326.11  $254.36  $246.16
Nice research Russ