SKU: 18257657724

HKS Super Fire Racing Spark Plug 50003-M40LF

$38.85 $43.17
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Description

HKS Super Fire Racing Spark Plug 50003-M40LFM Series Super Fire Spark Plugs HKS M Series spark plugs are high performance Iridium plugs designed to provide improved ignition performance, durability and anti carbon build up. 0. 6mm Iridium Alloy Center Electrode Outer Electrode with Platinum Chip Short Type Outer Electrode (Anti Vibration) Thermal Edge Spark Support Gap M Series is recommended for reliable ignition, durability and anti carbon buildup under high load. The Iridium alloy is used

M-Series Super Fire Spark Plugs

HKS M-Series spark plugs are high performance Iridium plugs designed to provide improved ignition performance, durability and anti-carbon build-up.

  • 0.6mm Iridium Alloy Center Electrode
  • Outer Electrode with Platinum Chip
  • Short Type Outer Electrode (Anti-Vibration)
  • Thermal Edge
  • Spark Support Gap

M Series is recommended for reliable ignition, durability and anti-carbon buildup under high load.

The Iridium alloy is used because of its durability and reliability.  On an average plug, a narrow core typically shortens life span of plug but with the intense durability of iridium there is no sacrifice in any longevity.  With a high melting point of 2454 degrees C, opposed to the 1769 degrees C of white gold, the electrode can tolerate the high levels of compression and minor knocking without any deterioration. A nickel coating on the housing also prevents the spark plug from premature deterioration.  The Iridium plugs are available for multiple applications and offered in "colder" heat ranges of 7 and up and specifically for rotary, heat ranges of 9 and up are offered.

Heat Range: NGK # 8
Thread Size: 14mm × 25mm
Wrench Size: 16mm

Fits:

2006 - 2009 MAZDA 3 L4 2.0 ALL From 6/2006 Thru 6/2009 Production Date  BKEP Chassis  Stock Plug/Heat Range: Conical Long Reach:5
2006 - 2009 MAZDA 3 L4 2.3 ALL From 6/2006 Thru 6/2009 Production Date  BK3P Chassis  Stock Plug/Heat Range: Conical Long Reach:5
2009 - 2011 MAZDA 3 L4 2.0 ALL From 6/2009 Thru 8/2011 Production Date  BLEFP Chassis  Stock Plug/Heat Range: Conical Long Reach:6
2009 - 2013 MAZDA 3 L4 2.0 ALL From 6/2009 Thru 11/2013 Production Date  BLEAP Chassis  Stock Plug/Heat Range: Conical Long Reach:5
2007 - 2009 MAZDA 3 L4 2.3 MZR From 6/2006 Thru 6/2009 Production Date  BK3P Chassis  Stock Plug/Heat Range: Conical Long Reach:6
2009 - 2013 MAZDA 3 L4 2.3 MZR From 6/2009 Thru 11/2013 Production Date  BL3FW Chassis  Stock Plug/Heat Range: Conical Long Reach:6
2005 - 2007 MAZDA 6 L4 2.3 ALL From 6/2005 Thru 12/2007 Production Date  GG3P Chassis  Stock Plug/Heat Range: Conical Long Reach:5
2008 - 2012 MAZDA 6 L4 2.5 ALL From 1/2008 Thru 11/2012 Production Date  GH5FP/GH5AP Chassis  Stock Plug/Heat Range: Conical Long Reach:5
2006 - 2007 MAZDA 6 L4 2.3 MZR From 6/2005 Thru 12/2007 Production Date  GG3P Chassis  Stock Plug/Heat Range: Conical Long Reach:6
2007 - 2011 MAZDA CX-7 L4 2.3 MZR From 12/2006 Thru 12/2011 Production Date  ER3P Chassis  Stock Plug/Heat Range: Conical Long Reach:5
2006 - 2014 MAZDA MX-5 MIATA L4 2.0 ALL From 8/2005 Production Date  NCEC Chassis  Stock Plug/Heat Range: Conical Long Reach:6
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 18257657724

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4.2 ★★★★★
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Verified Purchase
T. H.
Phoenix, US
★★★★★ 5
Excellent value for an automatic watch, keeps VERY good time.
Color: Grey, Color: Grey
I've only had the watch for a day but wanted to leave a quick review on it to share a couple of notes. So far it keeps VERY good time, better than any of the automatics I own (including a Rolex Submariner, Tag Heuer Aquaracer, Tag Heuer Formula One, and several other sub $1k watches). I set it to an atomic time app on my phone yesterday and 24 hours later it's still SPOT on - hasn't gained/lost even a 1/10 of a second. I was shocked to see it's kept PERFECT time for the last day, I'm really blown away so far. I've worn it the entire time, we'll see how well it keeps time while being stored in a winder. This picture shown is the watch with a 22mm leather band on it, fit's without any issues (just need to squeeze in the leather a tad). I doubt it would work with a 22mm metal bracelet, but leather works great. Just FYI since the 21mm lug width is kind of odd. The face isn't quite a lustrious as the images make it look, but it's still a great-looking watch. For a sub $1000 automatic you can't go wrong, this is a fantastic watch at a great price. It'll be my daily driver for some time I'm sure. If I have any issues in the future I'll update the review.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 22, 2021
B
Verified Purchase
Beniamin Grigoryan
Los Angeles, US
★★★★★ 5
It looks really cool and striking.
Color: Grey, Color: Grey
Really cool and beautiful watch. Although my specific unit runs 5 seconds fast every day—at first it’s annoying, but eventually you stop caring. 🤣
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Reviewed in the United States on April 16, 2026
P
Verified Purchase
Paul Andreini
Lexington, US
★★★★★ 5
A Beautiful Timepiece at an Awesome Price!!
Color: Grey, Color: Grey
I have lusted after this watch for four months. I first tried on a similar model (stainless steel band with a green face) in a local jewelry shop (Spitz Jewlers, Walnut Creek, CA, USA). It was "love at first sight," even if I didn't love the white lines on the face from 12-6 and 3-9. At the time, the MSRP was $775. The MSRP has since increased to $795. But I bought this beauty on Amazon.com for only $524.99; after applying the cash-back from my Prime credit card, this watch costs only $498.75. This was "the offer that I could not refuse," to quote from "The Godfather." Accuracy could be better: after only a few days, it is now 7 seconds behind my phone (to which I set my new watch). But I don't really care about that all that much. This is why I rated "accuracy" at 4 stars, but my overall review is 5 stars. My video shows the date changing suddenly at 11:59:59pm, just how I want it; in another photo, you can see that my Seiko changes the date more slowly, which I do not like. This watch is absolutely phenomenally beautiful. If you're on the fence over whether to make this purchase, then I would say "go for it!" You will not find a prettier, more accurate watch at a lower price in ANY store in the entire USA.
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Reviewed in the United States on April 28, 2023
P
Verified Purchase
pradeepkanth
Alexandria, US
★★★★★ 4
Classy and sporty. Great value!
Color: Grey, Color: Grey
Excellent watch for the price. Looks sporty and dressy. More towards dress watch. Blue is dynamic. Strongly recommend blue for sporty feel. I was thinking of aqua terra. This come close to it with a price less than what i would have paid my state tax for omega aqua terra. My only concern is bracelet which i feel kind of OK. Better bracelet design would have made this watch much superior. 21 lug width is awful. Other than that, nothing to complain.
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Reviewed in the United States on July 13, 2020
T
Verified Purchase
Tim Shepherd
West Palm Beach, US
★★★★★ 5
Stunning Gentleman's Watch
Color: Grey
This is my second Tissot watch. It's quite stunning in person. The online photos don't do it justice. It has the look and feel of a much more expensive gentleman's watch which makes this purchase a great bargain. Tissot is a great reliable Swiss made watch brand. My first Tissot watch which is probably more than 20 years old still runs great. Very pleased with this purchase.
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Reviewed in the United States on October 16, 2025

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