will these plugs fit a fr730v kawasaki engine?????

Yes I used these on my Toro Timecutter mower with the same Kawasaki engine. They work fine.

Will this plug fit my Husqvarna Z254F 54 inch zero turn

Check reference books in auto shop or dept. for specifics accompanied to what your whip manual lists.

Is the spark plug pre-gapped or do I need to do it?

They're gapped at about .032"...my application calls for .030", so I adjusted them.

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We remain fully operational. Our teams are working around the clock to ensure your deliveries continue safely.

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NGK 6578 Spark Plugs (BPR4ES) - Pack of 2, Copper

Product ID: 328933686

Details

Brand
NGK
Core material
Copper
Thread size
14mm
Top material type
Alumina
Vehicle service type
Motorcycle

⚡Corrugated ribs prevent flashover for reliable ignition

🔥Copper core for superior heat dissipation

🛡️Trivalent metal plating resists corrosion & seizing

Description

⚡ Ignite your engine’s potential with NGK’s precision spark plugs!

DURABILITY THAT LASTS - Trivalent metal plating ensures long-term anti-corrosion and anti-seizing protection
IGNITION YOU CAN TRUST - Corrugated ribs eliminate flashover, delivering consistent spark performance
PROVEN LEGACY OF QUALITY - NGK’s trusted spark plugs, favored by professionals for decades
STRENGTH MEETS PRECISION - Pure alumina silicate ceramic insulator offers superior strength and optimal heat transfer
UNMATCHED HEAT MANAGEMENT - Copper core rapidly removes heat, boosting engine efficiency

The NGK 6578 Spark Plugs (BPR4ES) pack of 2 features a copper core for enhanced heat removal, trivalent metal plating for superior corrosion and seizing resistance, and corrugated ribs to prevent flashover. Designed with a pure alumina silicate ceramic insulator, these plugs deliver reliable ignition and durability, making them a trusted choice for professional-grade engine performance.

Specifications

ASIN	B07CCGGMNZ
Best Sellers Rank	295,910 in Automotive ( See Top 100 in Automotive ) 1,216 in Car Spark Plugs
Brand	NGK
Customer Reviews	4.8 4.8 out of 5 stars (3,004)
Date First Available	18 Dec. 2016
Item Weight	118 g
Item model number	6578
Manufacturer	NGK
Manufacturer part number	6578
Position	Front, Rear
Product Dimensions	8.41 x 2.39 x 4.22 cm; 117.93 g

Reviews

J**R

Item as described. Fitment as described. Would buy from again.

3.07.2024

D**Y

Wored perfectly. Only neede 2 for ZTR, saving spare 2 for next.tune up. Thak you! Great NGK quality as usual! Have used this brand for decades in my motorcyces. Never an issue! Rhank you!!

6.10.2025

D**N

Fixed the issue with getting the mower started. Always starts even I cold weather. Excellent plug. When needed will buy for sure without hesitation

20.01.2026

S**N

Works great

9.08.2025

S**T

These work great

13.06.2025

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