Upgrade Kit for X3B/X5B

This is an upgrade kit for Nova Engines X3B and X5B models that were manufactured prior to January 2026. This upgrade kit will also work on the Classic RC "Hot Rod" .21 engine.

Kit includes:

Lightweight Connecting Rod
Purple anodized carb sealing ring
Ported backplate

All X3B and X5B models manufactured in 2026 or later already come equipped with these features. You can check the bottom of your crankcase for the date code if you aren't sure when your engine was made.

If you would like to have the update kit installed on your used engine, please contact us.