YS Engine YSS7138 regulator spring spare for regulator assemblies  [YSS7138]

Regulator spring for tuning

The YS Engine YSS7138 regulator spring is an RC-scale replacement spring intended for regulator assemblies used with YS Engine equipment. It serves as a straightforward spare part for hobbyists maintaining or fine-tuning fuel-powered RC setups, described here in neutral technical terms.

Functionally, this spring defines part of the regulator's preload and influences throttle return and idle characteristics; swapping springs is a common way to alter small changes in throttle response without changing larger regulator components. The part is sold as an individual spring element to be fitted into the regulator mechanism.

Installation is performed at the regulator assembly level: access the regulator spring area, remove the existing spring, and install the YSS7138 in the same orientation. After replacement, verify idle and throttle travel on the bench before running the model, confirming expected behavior under controlled conditions.

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