3x42 O-Ring Seal for Zenoah K700013042 G290PUM Replacement  [K700013042]

Sealing and tuning considerations for 3x42 rings

The Zenoah K700013042 O-ring is supplied as a single 3x42 replacement sealing element for RC assemblies, intended for routine service and minor repairs. It restores sealing surfaces and prevents leaks but does not change engine performance on its own.

For fitting, verify grooves are free of debris, press the o-ring into place without twisting, and reassemble components so the ring compresses evenly. Correct sealing helps maintain consistent fuel delivery and prevents performance issues caused by air or fuel leaks.

Storage and handling: protect the o-ring from solvents and extended UV exposure, store flat at room temperature, and replace any ring that has visible cracks or permanent distortion. Match the ring to the parts list that calls out a 3x42 o-ring for confirmation.