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Description
HKS Super Fire Racing Spark Plug 50003-M40GM 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 × 19mm
Wrench Size: 20.8mm
Fits:
| 1985 - 1989 | HONDA | ACCORD | L4 | 1.8 | ALL | From 6/1985 Thru 9/1989 Production Date | CA1 Chassis | Stock Plug/Heat Range: LONG:5 | |
| 1987 - 1989 | HONDA | ACCORD | L4 | 2.0 | ALL | From 5/1987 Thru 9/1989 Production Date | CA5 Chassis | Stock Plug/Heat Range: LONG:5 | |
| 1988 - 1989 | HONDA | ACCORD | ALL | 2.0 | A20A3 | From 4/1988 Thru 9/1989 Production Date | CA6 Chassis | Stock Plug/Heat Range: LONG:5 | |
| 1982 - 1987 | HONDA | PRELUDE | L4 | 1.8 | ALL | From 11/1982 Thru 4/1987 Production Date | AB83 Chassis | Stock Plug/Heat Range: LONG:6 | |
| 1983 - 1987 | MAZDA | 626 | L4 | 2.0 | ALL | From 10/1983 Thru 2/1987 Production Date | GCEP Chassis | Stock Plug/Heat Range: LONG:6 | |
| 1993 - 1997 | MITSUBISHI | DIAMANTE | ALL | 3.0 | 6G72 | From 1/1993 Thru 1/1997 Production Date | K45 Chassis | Wagon SOHC | Stock Plug/Heat Range: LONG:6 |
| 1990 - 1995 | MITSUBISHI | ECLIPSE | ALL | 2.0 | 4G63 | From 2/1990 Thru 6/1995 Production Date | D22A Chassis | DOHC | Stock Plug/Heat Range: LONG:6 |
| 1990 - 1995 | MITSUBISHI | ECLIPSE | ALL | 2.0 | 4G63 | From 2/1990 Thru 6/1995 Production Date | D27A Chassis | Stock Plug/Heat Range: LONG:6 | |
| 1995 - 1999 | MITSUBISHI | ECLIPSE | ALL | 2.0 | 4G63 | From 6/1995 Thru 8/1999 Production Date | D32A Chassis | Stock Plug/Heat Range: LONG:6 | |
| 1997 - 1999 | MITSUBISHI | ECLIPSE | ALL | 2.0 | 4G63 | From 3/1997 Thru 8/1999 Production Date | D38A Chassis | Stock Plug/Heat Range: LONG:6 | |
| 1992 - 1992 | MITSUBISHI | LANCER | ALL | 2.0 | 4G63 | From 10/1991 Thru 1/1994 Production Date | CD9A Chassis | DOHC | Stock Plug/Heat Range: LONG:7 |
| 1993 - 1994 | MITSUBISHI | LANCER | ALL | 2.0 | 4G63 | From 1/1994 Thru 9/1994 Production Date | CE9A Chassis | DOHC | Stock Plug/Heat Range: LONG:7 |
| 1995 - 1995 | MITSUBISHI | LANCER | ALL | 2.0 | 4G63 | From 9/1994 Thru 8/1996 Production Date | CE9A Chassis | DOHC | Stock Plug/Heat Range: LONG:7 |
| 1996 - 1996 | MITSUBISHI | LANCER | ALL | 2.0 | 4G63 | From 8/1996 Thru 12/1997 Production Date | CN9A Chassis | DOHC | Stock Plug/Heat Range: LONG:7 |
| 2003 - 2005 | MITSUBISHI | LANCER | ALL | 2.0 | 4G63 | From 2/2004 Thru 2/2005 Production Date | CT9A Chassis | DOHC | Stock Plug/Heat Range: LONG:7 |
| 1997 - 1998 | MITSUBISHI | LANCER | ALL | 2.0 | 4G63 | From 1/1998 Thru 12/1998 Production Date | CP9A Chassis | DOHC | Stock Plug/Heat Range: LONG:7 |
| 1999 - 2000 | MITSUBISHI | LANCER | ALL | 2.0 | 4G63 | From 1/1999 Thru 1/2001 Production Date | CP9A Chassis | DOHC | Stock Plug/Heat Range: LONG:7 |
| 1999 - 2000 | MITSUBISHI | LANCER | ALL | 2.0 | 4G63 | From 1/2000 Thru 1/2001 Production Date | CP9A Chassis | Tommi Makinen Edition DOHC | Stock Plug/Heat Range: LONG:7 |
| 2001 - 2002 | MITSUBISHI | LANCER | ALL | 2.0 | 4G63 | From 2/2001 Thru 3/2002 Production Date | CT9A Chassis | DOHC | Stock Plug/Heat Range: LONG:7 |
| 2003 - 2005 | MITSUBISHI | LANCER | ALL | 2.0 | 4G63 | From 2/2003 Thru 1/2004 Production Date | CT9A Chassis | DOHC | Stock Plug/Heat Range: LONG:7 |
| 1988 - 1991 | MITSUBISHI | MONTERO | V6 | 3.0 | ALL | From 9/1988 Thru 1/1991 Production Date | L141/146GW Chassis | Stock Plug/Heat Range: LONG:5 | |
| 1988 - 1990 | MITSUBISHI | STARION | ALL | 2.6 | ALL | From 5/1988 Thru 10/1990 Production Date | A187A Chassis | Stock Plug/Heat Range: LONG:7 | |
| 1985 - 1988 | SUBARU | JUSTY | L3 | 1.2 | ALL | From 10/1985 Thru 10/1988 Production Date | KA7/KA8 Chassis | Stock Plug/Heat Range: LONG:6 | |
| 1988 - 1994 | SUBARU | JUSTY | L3 | 1.2 | ALL | From 11/1988 Thru 3/1994 Production Date | KA7/KA8 Chassis | Stock Plug/Heat Range: LONG:6 | |
| 1983 - 1986 | TOYOTA | CELICA | L6 | 2.8 | 5MGE | From 8/1983 Thru 2/1986 Production Date | MA61 Chassis | Stock Plug/Heat Range: LONG:5 | |
| 1988 - 1992 | TOYOTA | LAND CRUISER | ALL | 4.0 | 3FE | From 8/1988 Thru 8/1992 Production Date | FJ62G/FJ80G Chassis | Stock Plug/Heat Range: LONG:5 | |
| 1987 - 1990 | TOYOTA | TERCEL | ALL | 1.5 | 3E;3EE | From 5/1986 Thru 9/1990 Production Date | EL31 Chassis | Stock Plug/Heat Range: LONG:5 | |
| 1989 - 1992 | VOLKSWAGEN | GOLF | ALL | 1.8 | RV | From 10/1989 Thru 3/1992 Production Date | E-19RV Chassis | Stock Plug/Heat Range: LONG:6 | |
| 1989 - 1992 | VOLKSWAGEN | JETTA | ALL | 1.8 | ALL | From 10/1989 Thru 11/1991 Production Date | E-16RV Chassis | Stock Plug/Heat Range: LONG:6 |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.6 ★★★★★
Based on 18 reviews
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Product Reviews
★★★★★ 5
Seem to run slightly larger
Size: 3T-4T, Unit Count: 112
These are cute and my son loves the Buzz picture on them. I buy multiple different pull ups, and these have been great however I do think they run slightly larger. The quality is great, we haven’t had any leaks, and my son loves to wear them. He can easily pull them up and down himself.
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Reviewed in the United States on September 17, 2024
★★★★★ 4
Soft and comfortable for sensitive skinned toddlers
Size: 2T-3T, Unit Count: 76
I’ve been using the Pull-Ups Boys' Skin Essentials Potty Training Pants for a few months now, and overall, they’ve been a great help during potty training. One of the best features is the velcro sides, which make on-the-go changes a breeze—especially when I need to leave my toddler’s shoes and pants on. It’s incredibly convenient and saves time.
The training pants are also very soft and comfortable, which is important for a toddler with sensitive skin. However, I did have to size up as my toddler quickly grew out of them. (wears a size 2t but he fits the 4t pullups better)
While these Pull-Ups have worked well for daytime use, I have experienced some issues with overnight leaking. This can be a bit of a hassle, so I’m still experimenting with different strategies to manage that. Overall, though, they’re a solid choice for potty training and are very comfortable for my toddler. Highly recommend for daytime use, though you might want to consider something else for overnight protection.
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Reviewed in the United States on December 26, 2024
★★★★★ 5
Soft, Gentle, and Perfect for Sensitive Skin
Size: 2T-3T, Unit Count: 76
We use Pull-Ups Skin Essentials as “sleeping underwear” for nap time and bedtime with my mostly potty-trained son. He has eczema and is very sensitive to many diaper brands, but these have been amazing! They’re super soft, fit comfortably, and sit well on his skin without causing any rashes or breakouts. They also absorb well — we haven’t had any issues with leaks. A fantastic option for little ones with sensitive skin!
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Reviewed in the United States on June 19, 2025
★★★★★ 5
No leaks or blowouts! Great for sensitive skin
Size: 3T-4T, Unit Count: 112
We swapped my son who has sensitive skin to these and its been about 3 weeks with zero issue. No leakage(I put them through heavy testing) and no blowouts so far!
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Reviewed in the United States on February 15, 2026
★★★★★ 5
Excellent quality and adequate price
Size: Size 4, Unit Count: 120, Size: Size 4, Unit Count: 120
Got it — I’ll write you a strong, natural, insight-rich review
I’ve been using these diapers consistently since my daughterwas born, and after several reorders, I feel confident sharing a detailed review for parents who are trying to decide.
First, what really stands out is how lightweight yet absorbent they are. They don’t feel bulky when my baby is wearing them, which makes a noticeable difference in comfort—especially during longer stretches like naps or overnight use. Despite being light, the absorbency is reliable and holds up well throughout the day.
One feature I truly appreciate is the quality of the inner filling. Unlike some other brands I’ve tried, the padding here does not become lumpy or uneven, even after extended wear. It stays evenly distributed, which not only improves comfort but also helps prevent leaks.
Comfort overall is excellent. The material feels soft against the skin, and I haven’t noticed any irritation or redness. Another big plus for me is that these diapers are completely free of any strong odors or artificial scents. Some brands have a noticeable smell right out of the package, which I personally don’t like—but these are refreshingly neutral.
Fit-wise, they stay in place well and don’t sag easily, even when full. That adds peace of mind, especially when we’re out or during overnight use.
I’ve reordered these multiple times now, which says a lot. They’ve been consistently reliable, comfortable, and well-made. Based on my experience, I would definitely recommend them to other parents looking for a dependable everyday diaper.
Overall, a solid choice that balances comfort, quality, and performance.
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Reviewed in the United States on March 20, 2026