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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Spark Plug LFR6A- Set of 4 | Replaces 22401-AR716 94702-00427 94709-00427. 30k-60k mileage rated.

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

📦Set of 4 with original packaging

🔥Copper core for superior ignition

🔧Direct vehicle-specific fit

$76.46

Duties & taxes included

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Description

⚡ Ignite your drive with NGK’s power-packed spark plugs!

BULK VALUE PACK - Set of 4 plugs to keep your engine running smooth longer
TOP RATED PERFORMANCE - 4.7-star rating from 189+ satisfied drivers
PRECISION ENGINE IGNITION - Copper core ensures optimal spark and fuel efficiency
TAILORED FIT ZERO HASSLE - Vehicle-specific design for seamless installation
TRUSTED QUALITY ASSURANCE - Genuine NGK parts backed by manufacturer warranty

The NGK LFR6A Spark Plug Set of 4 delivers reliable, vehicle-specific ignition performance with a copper core for enhanced fuel efficiency. Backed by NGK’s trusted manufacturing and a 4.7-star customer rating, this genuine replacement pack ensures your engine runs smoother and longer with easy installation and original packaging.

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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