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Your cart is empty.Genuine 4 pack NGK Iridium IX 3521 Spark Plug
John
Reviewed in the United States on March 7, 2025
Good
Trevor
Reviewed in the United States on March 5, 2025
Best iv ever bought
John J.
Reviewed in the United States on February 9, 2025
I have been using these plugs in my bikes truck and snowmobiles since they came out. They are the best, starts easier, crisp throttle response, never fouled one either. A+++
Stuart Robertson
Reviewed in Canada on February 25, 2025
Perfect, just as advertised no issue good product
Jair
Reviewed in the United States on February 24, 2025
Bien bien
Lou
Reviewed in the United States on February 18, 2025
best spark pugs available
Mike H
Reviewed in the United States on September 5, 2024
Even though Amazon says they aren’t compatible, they work great with my 2020 FLHXS. I used the Bosch website to find the correct part and ordered through Amazon.They all came gapped at 0.032 inches, so I left them alone. Didn’t use anti-seize since the Harley service manual doesn’t call for it, and torqued them down to 100 in-lbs.I’ve put about 1,000 miles on them and I’ve noticed about a 15% increase in fuel mileage. It’s hard to say if I gained any more power since it had plenty of power to start with. My fuel mileage went from about 40 mpg to 46 mpg, depending on how I ride. My bike has about 45,000 miles on it and has a simple Stage 1 with the Screamin’ Eagle tuner.
Toldja
Reviewed in the United States on September 3, 2024
As described
Stewart
Reviewed in the United Kingdom on August 23, 2024
Good item would buy again
willytv
Reviewed in the United States on August 19, 2024
These are high-quality genuine NGK plugs. Delivery was fast and price was very competitive…
Ian ScrimgeourI
Reviewed in Australia on July 9, 2024
Plugs were perfectly packaged for overseas shipping. Arrived in expected time frame. Price was better than expected. Great company to deal with as they supplied timely ongoing updates of processes right up to delivery.Many thanks 👍
Sisel
Reviewed in Canada on November 6, 2024
Bought for Yamaha jet ski , worked as stated
lebreton christian
Reviewed in Canada on October 12, 2023
Bougie très bonne qualité haute performance
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