The Honda Recon 250 (TRX250) typically uses a standard 14mm spark plug, with NGK CR7HSA being the most commonly recommended replacement. Set the electrode gap to about 0.028–0.031 inches and verify the exact specification in your model-year manual before purchase.
Recommended spark plug
The following plug is the default starting point for most Honda Recon 250 engines. It fits the 14mm thread and matches the heat range commonly used on these four-stroke engines. Always confirm current specs for your specific model year.
- NGK CR7HSA spark plug (14mm thread; resistor type). Gap: 0.028–0.031 inches.
If CR7HSA is unavailable, you may use another NGK plug that matches the same thread size and heat range as specified in your manual or Honda parts catalog. Do not substitute a plug with a different heat range without confirming compatibility with your engine.
How to confirm the exact plug for your model year
Because the Recon 250 has seen multiple model years and regional variations, it’s important to verify the precise spec for your machine. The steps below help you source the correct plug.
- Identify the exact model year and market (US, Europe, etc.) of your Recon 250.
- Consult the official Honda service manual or the Honda Parts Catalog for your engine specification.
- Choose a plug with the same thread size (14mm), correct reach, and the recommended heat range as listed for your model year. NGK and Denso are common aftermarket options that match these specs.
- Verify the spark plug gap before installation (typically 0.028–0.031 inches for this engine).
- Install following the manual’s torque guidance and seating procedure; do not overtighten the plug.
Conclusion: The safest approach is to match the plug to your exact model year’s official specification; NGK CR7HSA is a reliable default when the manual calls for a 14mm, standard-heat plug.
Summary
For most Honda Recon 250 riders, the NGK CR7HSA spark plug is the standard replacement, featuring a 14mm thread and a recommended gap of 0.028–0.031 inches. Always verify your model-year specification in the owner’s manual or Honda Parts Catalog, and use a plug that matches the correct thread size, reach, and heat range. When in doubt, consult a Honda dealer or a trusted ATV technician to confirm the exact part for your bike. Regular replacement helps ensure reliable starts and efficient combustion.