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

Ngk Spark Plug Lfr6a Set Of 4 | Desertcart Croatia

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Description

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

PERFECT FIT GUARANTEE - Vehicle-specific design for seamless replacement
TRUSTED BRAND QUALITY - Manufactured by NGK Japan with OEM equivalent standards
LONG LASTING PERFORMANCE - Rated for 30,000 to 60,000 miles of reliable use
PRECISION ENGINE IGNITION - Genuine NGK parts ensure flawless spark every time
COMPLETE READY TO INSTALL SET - Includes original packaging and hardware for hassle-free upgrade

This set of 4 NGK V-Power LFR6A spark plugs delivers reliable ignition performance with a copper core for enhanced conductivity and durability rated between 30,000 to 60,000 miles. Designed as a direct replacement with vehicle-specific fitment, these genuine NGK parts come complete with original packaging and hardware, backed by a trusted Japanese manufacturer warranty.

Specifications

ASIN	B00M5ETU32
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#75,185 in Automotive ( See Top 100 in Automotive ) #460 in Automotive Replacement Spark Plugs
Brand	NGK
Brand Name	NGK
Compatible with Vehicle Type	Car, Truck
Core Material	Copper
Customer Reviews	4.7 out of 5 stars 195 Reviews
Included Components	6668
Item Highlight	Replaces 22401-AR716 94702-00427 94709-00427. 30k-60k mileage rated.
Item Weight	7.68 ounces
Manufacturer	NGK Japan
Manufacturer Part Number	LFR6A
Manufacturer Warranty Description	Includes manufacturer provided warranty
Model Number	6668
Number of Items	1
OEM Equivalent Part Number	LFR6A
Thread Size	14mm x 26.5mm
Top Material Type	Zinc-Chromate
UPC	605349701825
Unit Count	1 Count
Vehicle Service Type	Car, Truck

Reviews

E**H

Good plugs

These plug’s restored my Waverunner to smooth full power. I’ve used NGK plugs for 50 years now, cars, bikes, boats the plugs always worked well.

14.07.2025

R**S

Great replacement spark plug!

13.10.2025

T**K

Fixes rough running

Can’t go wrong with NGK for Yamaha motors

25.07.2026

R**R

Yamaha Jetboat 190 FSH plugs

Great fit, runs like a dream

19.06.2026

K**R

Easy installation

Item as described

3.08.2024

K**R

Good service

As expected

6.10.2025

Y**S

La usamos para nuestro jestski

Son ideal y perfecta para jetskit Yamaha la recomiendo

27.07.2025

M**C

Just as described

Came in as expected, new in box with no damage. Don't foresee having any issues with installation as they are direct OEM replacement for my application.

21.04.2025

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

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€ 67.86

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago