If your Honda 4518 or 5518 engine (or compatible GX640 models) is misfiring, hard to start, or running rough, the CDI box might be the culprit. This SELEAD CDI module is a direct replacement that restores proper ignition timing and spark. The CDI (capacitor discharge ignition) box controls when the spark plug fires – if it fails, your engine won’t run right. This unit is designed to match the original specifications for Honda engines listed, including various H4518H and H5518 types (check the compatibility list carefully). Installation is straightforward if you’re familiar with small engine components: just disconnect the old box and plug in this one. It’s a crucial part for keeping your mower, generator, or other equipment running smoothly. Always double‑check your engine model and old part number before ordering to ensure a perfect fit. Keep a spare on hand or replace a faulty unit to get your Honda engine back to reliable performance.
