GS650g oring 51181-31030

[Eric]

Does anyone know the fresh size of a 51181-31030 o ring?

Thank!

[bwringer]

The "31" starting the latter half of the o-ring is often (but not always) the nominal inside diameter in mm. The thickness or material of the o-ring don't seem to be encoded in part numbers.

However, the prefix is not the usual prefix used for o-rings, 09280-, so there may be something different about this one.

It looks like it's used somewhere in the forks, so maybe it's a different material, cross-section, or hardness than standard? To give one example, intake o-rings are made from a special heat-resistant material, so you can't use standard buna-n o-rings in the same size. Something similar might apply here.

I'd just order the correct part from one of the many online sellers of Suzuki parts.

[Cipher]

It should be the size of the fork tube externally and the cap internally
Its not sealing a moving part