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

Maintenance and longevity

The YS Engine YSS7138 regulator spring is a compact replacement spring meant for regulator assemblies used with YS Engine equipment. It is provided as an economical spare to help keep regulator units serviceable and reliable during routine maintenance.

The spring contributes to the regulator preload and directly affects idle stability and throttle return; replacing worn springs can help avoid erratic idle and extend the service life of the regulator mechanism. The part is sold as an individual spring element to be fitted into the regulator mechanism.

Replacement is carried out at the regulator assembly: expose the spring area, remove the old spring, and fit the YSS7138 in the correct orientation. After fitting, perform bench checks for idle and throttle response before running the engine to ensure correct operation.

As an economical spare, this part supports predictable performance and field repairs; it is intended for model use only and not for any full-size applications.