NGK CM-6 5812 Spark Plug 2-Pack — Compatible with Homelite E300, OEM Fit & Durable Ignition

If your generator is showing signs of hard starting, uneven idle, or reduced performance, worn or fouled spark plugs are often the easiest and most cost-effective part to replace. The NGK 5812 (CM-6) spark plug is manufactured to NGK's quality standards to provide consistent sparks, dependable starts, and extended service life for commercial and industrial small engines.

Which generators is this NGK spark plug compatible with?

This NGK CM-6 (part number 5812) is listed as a replacement for several Homelite, Honda and Suzuki generator models. Always compare your current plug's part number or consult your owner's manual to confirm fitment before purchase.

• Homelite: E300
• Honda: E300, E300 K1/K2/K3, E400, ED150, EM300 (and K1/K2/K3), EM400 (and K1), ER400
• Suzuki: SE300

How will replacing with the NGK 5812 improve my generator's operation?

Installing a fresh NGK CM-6 helps ensure a clean, strong spark at the correct gap which leads to easier starts and steadier engine speed under load. This can reduce misfires and rough idling that occur with aged or contaminated plugs.

• Promotes consistent ignition for reliable starting
• Helps smooth idle and steady RPM under varying loads
• Reduces sputtering and hesitation during acceleration

What features and build quality should I expect from this NGK part?

NGK manufactures to tight tolerances and uses materials selected for small-engine ignition demands. The CM-6 design focuses on durability and stable spark performance across typical generator operating conditions.

• Genuine NGK part number 5812 for authentic fit and function
• Engineered for dependable ignition and long service life
• Manufactured to NGK quality standards for durability

Are there any installation or fitment tips I should know?

Before replacing plugs, cool the engine and disconnect the spark plug wire. Check the new plug gap and torque to the manufacturer's spec to avoid damage or leakage.

• Confirm your generator model and existing plug part number first
• Inspect and set plug gap as specified in the owner manual
• Tighten to recommended torque; avoid overtightening the threads

Who is this for: The NGK 5812 CM-6 two-pack is ideal for DIY maintenance technicians, fleet service teams, and generator owners who need a proven, OEM-quality replacement plug for maintenance or seasonal service. If you operate a Homelite E300, one of the listed Honda models, or a Suzuki SE300, this NGK spark plug is a direct-fit option to keep your equipment starting reliably and running smoothly. Remember to verify fitment against your existing spark plug number or your equipment manual before ordering.