Yamaha Part Number Guide

[SoCal250]

R5 Pistons - Dykes type (see attached photo)
278-11631-09-96 STD
278-11635-09-00 1st over
278-11636-09-00 2nd over
278-11637-09-00 3rd over
278-11638-09-00 4th over

RD350 Pistons - Dykes type
360-11631-03-96 STD
360-11631-02-96
360-11631-01-96

360-11635-03-00 1st over
360-11635-02-00 
360-11635-01-00

360-11636-03-00 2nd over
360-11636-02-00 
360-11636-01-00

360-11637-03-00 3rd over
360-11637-02-00
360-11637-01-00

360-11638-03-00 4th over
360-11638-02-00
360-11638-01-00

R5 / RD350 Piston Rings - Dykes type
360-11610-02-00 STD
360-11610-12-00 1st over
360-11610-22-00 2nd over
360-11610-32-00 3rd over
360-11610-42-00 4th over

R5 / RD350 Piston Rings - keystone type
278-11610-01-00 STD
278-11610-11-00 1st over
278-11610-21-00 2nd over
278-11610-31-00 3rd over
278-11610-41-00 4th over


RD250 Pistons - Dykes type
361-11631-03-96 STD
361-11631-02-96

361-11635-03-00 1st over
361-11635-02-00

361-11636-03-00 2nd over
361-11636-02-00

361-11637-03-00 3rd over
361-11637-02-00

361-11638-03-00 4th over
316-11638-02-00


RD250 Piston Rings - Dykes type
361-11610-02-00 STD
361-11610-01-00

361-11610-12-00 1st over
361-11610-11-00

361-11610-22-00 2nd over
361-11610-21-00

361-11610-32-00 3rd over
361-11610-31-00

361-11610-42-00 4th over
361-11610-41-00

RD400 C/D/E Pistons
1A1-11631-00-96    PISTON STD
1A1-11635-00-00    PISTON 1 O/S
1A1-11636-00-00    PISTON 2 O/S
1A1-11637-00-00    PISTON 3 O/S
1A1-11638-00-00    PISTON 4 O/S

RD400 C/D/E Piston Rings
1A1-11610-00-00    PISTON RINGSET STD
1A1-11610-10-00    PISTON RINGSET 1ST
1A1-11610-20-00    PISTON RINGSET 2ND
1A1-11610-30-00    PISTON RINGSET 3RD
1A1-11610-40-00    PISTON RINGSET 4TH
(note: 1A1-11610-xx-xx are for 1A1 pistons. 1A1-11601-xx-xx ringsets are for 2V0 pistons.  2V0 pistons use two rings that are the same as the 1A1 piston top ring.)

RD400 C/D/E Piston Kits
1A1-11630-00-00    PISTON KIT STD
1A1-11630-10-00    PISTON KIT 1ST
1A1-11630-20-00    PISTON KIT 2ND
1A1-11630-30-00    PISTON KIT 3RD
1A1-11630-40-00    PISTON KIT 4TH

RD400F Pistons
2V0-11631-01-97    PISTON STD
2V0-11635-01-00    PISTON 1 O/S
2V0-11636-01-00    PISTON 2 O/S
2V0-11637-01-00    PISTON 3 O/S
2V0-11638-01-00    PISTON 4 O/S

RD400F Piston Rings
1A1-11601-00-00    PISTON RINGSET STD
1A1-11601-10-00    PISTON RINGSET 1ST
1A1-11601-20-00    PISTON RINGSET 2ND
1A1-11601-30-00    PISTON RINGSET 3RD
1A1-11601-40-00    PISTON RINGSET 4TH
(note: 1A1-11601-xx-xx ringsets are for 2V0 pistons. 1A1-11610-xx-xx are for 1A1 pistons. 2V0 pistons use two rings that are the same as the 1A1 piston top ring.)

RD400F Piston Kits
2V0-11630-00-00   PISTON KIT STD
2V0-11630-10-00   PISTON KIT 1ST
2V0-11630-20-00   PISTON KIT 2ND
2V0-11630-30-00   PISTON KIT 3RD
2V0-11630-40-00   PISTON KIT 4TH

[SoCal250]

RD125 B/C Pistons & Rings
396-11635-00 pair with 396-11610-00 rings (Dykes type ring), early parts
466-11635-01 pair with 307-11601-11 rings (standard square type rings), later parts

[SoCal250]

1) Yamaha Part Number Breakdown
2) Yamaha Part Number Breakdown, 1981 (PDF)
3) Yamaha Part Number Breakdown, detailed (Large file: Link to view/download)

[SoCal250]

1973-1975 RD250/RD350 Speedometer - MPH & KM/H
I had a question from a member about part numbers for speedometer variants so I did some research that I thought I'd share in case someone else needs it.

Decoding of the current USA part number reveals the following:
360-83570-XY-00  (I've replaced the portion of the part number that we're trying to find with the letters X & Y)
  360 = Model, which is for an RD350
  83570 = Speedometer
  X = Part variant #
  Y = Part design changes
  00 = Color/Finish
So, the latest USA speedometer part number tells us that the US models got the "4" version of the gauge, and the current part is the 3rd iteration of that part.
In doing my research I found that the EU (Germany) got the "2" version, which is for a gauge that reads in KM/H. I'm not certain if there were any further design changes beyond version 2, but that's the one I came up with, "22".

Part Numbers:
360-83570-43-00  1973-75 RD350  USA  (120 MPH)
360-83570-22-00  1973-75 RD350  EU    (200 KPH)