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The Green Spark Plug Company£7.73Visit shop Ngk Mr7g-9E 90312 Spark Plug Copper Core Mr7g9e New Ngk-Mr7g-9E
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The NGK MR7G-9E spark plug is designed for owners of motorcycles, classic engines, and various types of garden machinery who require a reliable, high-performance ignition component. Its key benefit is the copper-cored center electrode, which provides exceptional heat dissipation and resistance to fouling; however, users should note that as a standard nickel-alloy plug, it may have a shorter service life compared to specialized iridium or platinum alternatives.
| Model Part Number | 90312 |
|---|---|
| Brand | NGK |
No. You must verify compatibility against your motorcycle's make, model, and year manual to ensure the thread size, reach, and heat range match your specific engine.
The copper core provides better thermal conductivity than pure nickel, allowing the spark plug to dissipate heat faster to prevent overheating and fouling.
Replacement intervals depend on your engine type. Consult your owner's manual for recommended service intervals, generally checking every season or at standard service milestones.
Yes, it is designed for use in garden machinery, but verify your specific engine model requirements before installation.
The corrugated design increases the distance between the metal shell and the terminal, which prevents electrical flashover (short circuiting) on the outside of the plug.
Remove the spark plug and inspect the electrode for fouling or excessive gap wear. Clean or replace if necessary.
Ensure the spark plug lead is firmly attached and check the insulator for any visible cracks or signs of flashover.
Verify the engine's air-fuel mixture and timing. If the engine is running properly, the copper core should eventually burn off minor deposits during normal operation.
Before installation, always verify the thread size and reach against your engine manufacturer's specifications. When installing, tighten the plug to the specified torque settings to ensure the triple-seal construction functions correctly. Use a spark plug socket to avoid damaging the corrugated insulator during installation. Regular maintenance should include checking the electrode gap according to your engine manual and inspecting for carbon deposits or signs of overheating every few thousand miles or at the start of each gardening season.
