Is this the 6668 plug as listed in NGK site?

Yes - the 6668 NGK part number is the correct number for the LFR6A spark plug.

What is the difference between the lfr6a and the lfr6a-11? And are they interchangeable?

The major difference between these plugs is the LRF6A comes pre-gapped at .036" and the LFR6A-11 is pre-gapped at .044" Technically speaking you should use the correct one of these as spec'd for your application as over adjusting the gap to compensate is not recommended.

Are these the correct plugs for a yamaha sx190, 1.8 ho? thanks

Yes - these would be the correct plugs for a Yamaha SX190 boat with the 1.8L HO engine.

will these work in a 2018 vx ho?

Yes - these would be the correct spark plugs for a 2018 Yamaha VX Cruiser HO with the 1.8L 4-cylinder engine

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NGK Spark Plug LFR6A- Set of 4

Product ID: 76442605

Details

Brand
NGK
Core Material
Copper
Thread Size
14mm x 26.5mm
Top Material Type
Zinc-Chromate
Vehicle Service Type
Car Truck

⚡4-pack high-performance spark plugs

🔥Copper core for superior ignition

🔩Precision 14mm x 26.5mm thread size

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€ 67.86

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Description

⚡ Ignite your drive with NGK’s precision power!

POWER UP YOUR RIDE - Genuine NGK V-Power spark plugs engineered for optimal combustion and peak engine performance.
PERFECT FIT EVERY TIME - Direct replacement parts with precise 14mm x 26.5mm threading to ensure hassle-free installation.
TRUSTED QUALITY FROM JAPAN - Manufactured by NGK Japan, a global leader in spark plug technology and innovation.
DURABILITY MEETS EFFICIENCY - Copper core design delivers reliable ignition and longer lifespan under demanding conditions.
COMPLETE SET FOR CONVENIENCE - Includes 4 spark plugs with original packaging and hardware—ready to upgrade your vehicle instantly.

The NGK Spark Plug LFR6A Set of 4 features genuine NGK V-Power plugs with a copper core and zinc-chromate top for enhanced ignition and durability. Designed with a 14mm x 26.5mm thread size, these plugs are a direct fit for cars and trucks, ensuring easy installation and reliable performance. Manufactured in Japan, this set offers professional-grade quality to keep your engine running smoothly and efficiently.

Specifications

ASIN	B00M5ETU32
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#67,518 in Automotive ( See Top 100 in Automotive ) #450 in Automotive Replacement Spark Plugs
Brand Name	NGK
Compatible with Vehicle Type	Car, Truck
Core Material	Copper
Customer Reviews	4.7 4.7 out of 5 stars (189)
Included Components	6668
Item Weight	0.48 Pounds
Manufacturer	NGK Japan
Manufacturer Part Number	LFR6A
Manufacturer Warranty Description	Includes manufacturer provided warranty
Model Number	6668
Thread Size	14mm x 26.5mm
Top Material Type	Zinc-Chromate
UPC	605349701825
Unit Count	1.0 Count

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