This is an OEM-compatible spark plug cap spring supplied under Zenoah part number K140072121, intended as a direct replacement for the cap retention mechanism on specified small RC gas engine models. The component is an RC-scale accessory used to restore reliable contact and secure fit between the plug cap and ignition terminal on model-grade engines.
Installation is straightforward for hobby technicians familiar with basic engine service: remove the plug cap, replace the worn spring element, and re-seat the cap ensuring full contact without excess compression. No special tools are required beyond basic hand tools commonly found in an RC workshop.
In tuning and maintenance routines this spring plays a minor but practical role by keeping the plug cap properly seated during vibration and throttle changes, which helps maintain consistent ignition contact in running sessions. Replace springs as part of routine plug cap inspection when caps show looseness or intermittent contact.
Copyright © 2008-2026 rcjaz.com All rights reserved
