Upgrade for G230PUH/G230PUM: Zenoah K369991169 CHAMPION RCJ4 Spark Plug  [K369991169]

What the RCJ4 Plug Does

The CHAMPION RCJ4 plug is an aftermarket ignition electrode suited to Zenoah G230PUH and G230PUM engines, providing a direct replacement option to restore reliable spark. It helps keep combustion consistent across operating conditions.

Installation follows common glow-engine practice: remove the old plug with a correct spark plug socket, clear any debris from the thread area and sealing washer, hand-start the new plug then tighten to a secure fit with the socket. Avoid cross-threading and do not over-torque the plug.

From a tuning perspective the plug contributes to steady ignition timing and efficient combustion. Monitor electrode condition and gap during tuning sessions, replace if signs of fouling or damage appear, and factor plug condition into diagnostics for uneven idle or stalling.