Yamaha Part Numbers Explained ... Numbering Scheme / System

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Due to popular demand, here is some info on how to decipher Yamaha's
part numbers:


PART NUMBER SCHEME
---------------------------


Quote:
Side note -can anyone tell me how to decipher Yamaha's part numbers.
3GM-24110-01-01 this one is for the 91 fuel tank.
3LK-24110-01-01 this one is for the 89 fuel tank.


^^^ 1st 3 characters is model code/year/location
(e.g FZR1000 Exup for Sweden) of the bike that the part was FIRST
designed for.

5 characters to describe the part
eg. all -24110- are petrol tanks
all -13440- / 13441 are oil filters
(all engine parts start with 1, body parts start with 2, electrics 8, etc)

3rd set of numbers (2 digits) is modification code, eg -00 for the first
design of the part, -01 for a slight change (eg stronger material),
major differences eg -10 (for a muffler which is designed to be
quieter than others due to Swedish noise laws ).

Last set of numbers usually indicates colour code if the part is painted.
This is often -00 or left off/ignored.


There are exceptions, especially GYTR parts and add-on parts
which are a bit random.

Also, parts that Yamaha consider "generic" that can be bought from
any major factory (such as standard size o-rings and bolts and
washers) are part numbered 9xxxx-xxxxx.
For example, common engine o-rings are 90210-xxxxx.


INTERCHANGEABILITY:
------------------------

Most of the time a part is interchangeable IF
the first and second groups are the same, only the 3rd group different.

eg
xxx-xxxxx-00
xxx-xxxxx-01

But there are many interchangeabilities (?) that you can't
tell from the part number without Yamaha's computer system.
For example,
many FZR-Genesis parts 2GH-xxxxx-xx
are swappable onto
FZR-Exup 3gm-xxxxx-xx
and
Thunderace 4SL-xxxxx-xx.
These you will not know without experience trying them out, or
Yamaha's computer system.

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info posted by amakarovnik in Virago Tech Forum:

And now, a real secret: the system for generic hardware.

The first set of digits identifies what kind of hardware:
98501 = panhead screw
91311 = allen head screw
92990 = lockwasher
etc.

The next set of digits give the dimensions - 05010 is 5mm diameter, 10mm in length.

For example, want to replace the crankcase cover screws with stainless steel screws? You need 3 6x20mm (91311-06020), 9 6x25 (91311-06025), 8 6x30 (91311-06030) and 4 6x40mm (91311-06040). And don't forget to use antiseize.

With these codes, you can replace fasteners not covered in the usual kits of chrome/stainless fasteners.

Don't forget that some fasteners are high tensile strength, so you shouldn't substitute a weaker fastener that's the same dimensionally.