Zenoah K140072121 Spark Plug Cap Retention Spring for G230-290, G380, G450, G620, G800  [K140072121]

ZENOAH SPARK PLUG CAP SPRING G230-290,G380,G450,G620,G800 #140072121 (W/O PACKING) (REPLACE #505043101)
Price:
£2.40
Brand:
Zenoah
Model:
K140072121
Condition:
Brand New
Write a review

Cap spring for Zenoah G-series models

Supplied under Zenoah part number K140072121, this spring is an OEM-style replacement for the retention mechanism used on the named small RC gas engines. It is intended to restore and secure the contact between the plug cap and the engine ignition terminal.

Replacement is a routine workshop job: pull the plug cap off, swap in the K140072121 spring for the worn unit, and press the cap back ensuring a solid seat without over-tightening. The job requires only basic hand tools and a careful touch.

Keeping the spring in good condition helps prevent cap movement from vibration or throttle changes, which supports consistent ignition during use. Replace springs when you detect looseness, intermittent sparks, or visible wear.

Compatible Models

  • G230-290
  • G380
  • G450
  • G620
  • G800

Are these springs interchangeable across the G-series?

The K140072121 spring is specified for the listed G-series models. Check the part number and your engine model before fitting to ensure compatibility across different G-series variants.

Where should I source genuine replacements?

Obtain K140072121 from reputable hobby suppliers or official parts distributors that list Zenoah components. Using correct part numbers ensures proper fit and function.

Can a worn spring cause misfires?

Yes. A weakened or deformed spring can allow the cap to shift and cause intermittent contact, which may present as misfires. Replacing the spring can resolve such ignition instability.

Copyright © 2008-2026 rcjaz.co.uk All rights reserved