AUC4587
Factory-Original SU piston spring.

This is the "Light Blue" version with a load at length of 2.5 oz. @ 2.625 in.

It is recognizable by the light blue paint on one of the ends (see photo, although difficult to see).

These springs generate a resistance which balances the venturi size with the correct air flow and mixture.
Consequently, this spring is considered an important "tuning part" so choose yours wisely.

This product is priced, and sold, as a single unit.
Required quantity per carburetor: 1

This is an original SU part.

This is SU part number: AUC4587 / AUC 4587

* Made in the UK *