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NGK Standard Spark Plug
Part Number: CR9EB | NGK Stock #: 6955
There's a reason the CR9EB has been the default OEM plug for Yamaha powersports for years. Same spec, same materials, same quality as what your machine left the factory with. No compromises, no gimmicks — just a plug that does its job every ride.
The 98% pure copper core handles heat dissipation better than anything in this price range. Trivalent metal plating prevents seizing and corrosion on the shell, so removal isn't a fight. Triple gasket sealing keeps combustion gases locked where they belong. Cold-rolled threads eliminate cross-threading risk on install — especially important on aluminum heads.
Full Specifications
Part Number: NGK6955
Description: NGK Standard Spark Plug
Part Number: CR9EB
Stock Number: 6955
Resistance: 5000.0 Ohm
Ground Electrode Tip Design: Standard
Ground Electrode Core Material: Nickel
Electrical Terminal Type: Non-Removable Nut
Center Electrode Core Material: Copper
Center Electrode Tip Material: Nickel
Pre-Gap Size: 0.031" (0.8mm)
Hex Size: 5/8" (16mm)
Heat Range: 9
Seat Type: Gasket (Flat)
Reach: 0.75 in. (19mm)
Thread Diameter: 10mm
Compatibility
OEM replacement for Yamaha WaveRunners, Jet Boats, and select motorcycles. Replaces Yamaha OEM part 94702-00409-00. Kawasaki (92070-0002), Harley-Davidson (RG6HCC), Denso (U27ESR-NB), and Champion (G57C). Always confirm against your owner's manual before ordering.
Installation
Use a 5/8" socket and torque wrench. Torque to 7.2–10.8 lb-ft on cast iron heads, 7.2–8.7 lb-ft on aluminum. Skip the anti-seize — trivalent plating handles corrosion protection. Plug ships pre-gapped at 0.031", but verify against your engine's service spec before installing.
Who This Is For
Anyone whose machine came factory-spec'd with the CR9EB and wants the correct replacement without dealer markup. This is a nickel electrode plug — not the right choice if your engine originally came with iridium or platinum plugs.
FAQs
Does it come pre-gapped?
Yes, at 0.031". Still worth checking against your specific application before installing.
Do I need anti-seize?
No. The trivalent plating handles it. Adding anti-seize throws off your torque reading.
What's the correct torque?
7.2–10.8 lb-ft for cast iron, 7.2–8.7 lb-ft for aluminum heads.
How long will it last?
Typically 10,000–15,000 miles under normal conditions. Inspect sooner if you're running a tune or ethanol-blend fuel.
Is this the same plug from the dealer?
Same plug, same factory. Just without the parts counter markup.
No compatible vehicles data available.
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