GOOD PRODUCT
VALUE WAS GREAT FOR QUALITY. FIT WAS PERFECT START WAS RIGHT ON. POWER WAS IMPROVED. DURABLE AS IT SHOULD BE Read more
NGK
NGK CR9EIX - Iridium IX Spark Plug - 4-Pack -
$35.99$59.99
About this item
- 4 pack NGK Iridium IX 3521 Spark Plug
- Genuine NGK Parts
- Includes original packaging and hardware
- Direct replacement auto parts
- Confirm vehicle fitment with Amazon Confirmed Fit
Key details
- Brand
- NGK
- Core Material
- Iridium
- Top Material Type
- Iridium
- Vehicle Service Type
- Car, Truck
- core_material
- Iridium
Dimensions and fit
- dimensions
- 3.31 x 0.94 x 3.32 inches
- weight
- 4.5 ounces
- Thread Size
- 10mm
- thread_size
- 10mm
- automotive_fit_type
- Vehicle Specific Fit
- item_weight
- 4.5 ounces
- product_dimensions
- 3.31 x 0.94 x 3.32 inches
Technical specifications
- model
- 4 pack NGK Iridium IX 3521 Spark Plug
- item_model_number
- 3521
Item information
- top_material_type
- Iridium
- vehicle_service_type
- Car, Truck
- oem_part_number
- 7085731
- manufacturer
- NGK
- is_discontinued_by_manufacturer
- No
- manufacturer_part_number
- CR9EIX
- position
- Front, Rear
- best_sellers_rank
- #12,033 in Automotive ( See Top 100 in Automotive ) #57 in Automotive Replacement Spark Plugs
- date_first_available
- April 10, 2012
Highlights
About this item
- 4 pack NGK Iridium IX 3521 Spark Plug
- Genuine NGK Parts
- Includes original packaging and hardware
- Direct replacement auto parts
- Confirm vehicle fitment with Amazon Confirmed Fit
Ask about this product
Product videos
Product video 1
Customer reviews
495 reviewsPositive
Rated 4.8/5 across 495 reviews — highly regarded by customers.
- 100% of sampled reviews are from verified purchases.
- 88% of sampled reviews give 4–5 stars.
Customers say
Customers find these spark plugs to be of good quality, with one mentioning they're the best plugs for the M8 Harley. Customers like the throttle response, with one mentioning improved performance at both idle and full throttle.
Generated from the text of customer reviews
Good
Great price for these quality spark plugs. My bike is running better! Read more
Great plugs
I installed these in my 2021 Indian Scout Bobber ABS. I can see the improvement over the regular plugs. The bike starts better and runs better at idle and full throttle. I recommend them. Read more
Great product, great price, great company
Great!! Can’t go wrong! Read more
Dealer performance without the dealer price
NGK CR9EIX Iridium IX Spark Plug – 4 Pack Installed these in my bike and it fired right up with no skips or hesitation. These appear to be very comparable to the much more expensive Screamin’ Eagle plugs sold by Harley. Looking at them side by side, they seem to be essentially the same plug with different branding. They come with a preset gap, which is a nice plus. Of course my OCD still requires me to check them anyway, but all four were spot on and didn’t need any adjustment. I can’t speak yet to long-term durability, but NGK has a strong reputation and I expect them to hold up well. For reference, these were installed in a 2019 Harley-Davidson Softail 114. Overall, a great value compared to the dealer-branded option. Read more
Muy buena calidad, lo recomiendo
Muy bueno el producto lo recomiendo Read more
Harley Plugs
Bike seems to idle & run better Read more
As described
As advertised Read more
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