YS Engine YSS7138 Regulator Spring Spare for Regulator Assemblies  [YSS7138]

Fine-tuning regulator behaviour

The YS Engine YSS7138 regulator spring is an RC-scale replacement spring intended for regulator assemblies used with YS Engine equipment. It is supplied as a single spring element for hobbyists who want a simple spare or small tuning change.

Functionally, this spring sets part of the regulator preload and affects throttle return and idle characteristics; swapping springs is a common way to make incremental changes to throttle response without replacing larger regulator parts. The part is sold as an individual spring element to be fitted into the regulator mechanism.

Installation takes place at the regulator assembly level: access the spring cavity, remove the old spring, and fit the YSS7138 in the same orientation. After refit, check idle and throttle travel on a bench before running the model to confirm expected behaviour under controlled conditions.

Offered as a low-cost spare, this item suits maintenance, small tuning jobs, and keeping a parts reserve for field repairs; it is described strictly as an RC accessory and not for any full-size vehicle use.