NGK 4929 DPR8EA-9 Spark Plug (4 Pack)

Works great! Very nice OEM Spark plugs. They last a long time, fast easy starts, Pre Gap accuracy was close and great engine power. Perfect length and easy to replace.

Good price and perfect fit.

Perfect fit for my 1984 Honda Goldwing motorcycle. Name brand - exactly what is expected for fitment, functionality and quality. Replace the 22 year old plugs and helped me get my bike re-started for the first time since 2005.

The product was perfect and high quality! It was delivered exactly as promised.

As a weekend mechanic with a garage full of aging rides—including a finicky 2005 Honda CRF230F dirt bike that’s seen better days—I’ve learned the hard way that skimping on spark plugs leads to sputtering starts and wasted track time. Last summer, after chasing misfires that turned my trail runs into push-fests, I swapped in a pack of four NGK DPR8EA-9 plugs (part #4929) from O’Reilly Auto Parts for about $12. These copper-core standards are a go-to for Japanese bikes and cars, and after 500+ miles of dusty abuse, they’re proving why NGK’s rep for durability isn’t hype. Here’s my no-BS rundown. The Good: Consistent Fire, Easy Swap, and Wallet-Friendly Reliability Popping these in was a 15-minute job—no special tools beyond a gap checker. They threaded in smoothly on my CRF’s heads, with a pre-gapped .031” spec that’s spot-on for most applications (though I tweaked to .025” for my setup, as forum folks swear by it for tuned engines). The pure alumina silicate ceramic insulator and trivalent metal plating shrugged off corrosion like a champ, even after muddy rides and pressure washes. Power delivery sharpened up immediately—smoother idle, crisper throttle response, and zero bogging under load. Folks on dirt bike threads report the same: one rider on a Yamaha VMAX called it a “perfect fit and heat range” that revived their ‘97 beast. At 4.7/5 stars across 21 reviews, it’s clear this plug’s copper core delivers hot, reliable sparks without the premium price tag of iridium upgrades. The four-pack is a smart buy for multi-cylinder setups, leaving me with spares for the next service. The Not-So-Good: Basic Build for Basic Needs These aren’t flashy—copper means they’ll need replacing every 20-30K miles, not the 100K eternity of pricier plugs. If you’re pushing high-compression mods or racing, some riders bump to a colder grade like DPR9EA-9 to avoid fouling, as one ThumperTalk user noted after swapping for hotter pistons. Gapping can vary from the factory (check yours!), and they’re not as forgiving on seized threads if you’ve neglected maintenance. For my stock CRF, though, these quirks were non-issues. Who It’s For (and Why It’s a Staple) Budget-conscious riders and DIYers with Hondas, Yamahas, or similar JDM iron will dig this pack—think trail blazers, commuters, or anyone tired of OEM headaches. It’s overkill for electric dreamers but a lifesaver for gas guzzlers needing affordable tune-ups. Summit Racing buyers rave about the timely delivery and undamaged packaging, making it a repeat for family fleets. Overall Rating: 4.5/5 Stars The NGK DPR8EA-9 pack of 4 is a fire-and-forget essential that punches way above its weight in reliability and value. If your ride’s coughing like an old smoker, these’ll get it humming again—grab ’em before your next spark of genius.

Buenas

Arrived safe

I tested each one using an ohm meter as described in a few youtube videos and they all tested fine. I just wanted to replace the existing spark plugs as I purchased a 1984 Honda Magna VF700C and wanted to have fresh plugs in it. The old ones were a little used and these worked well to keep the bike running smooth. Easy to replace following the reference manual for my bike and I always torque per the manual recommendations. Many people don't do that but if you don't torque properly you can either have lose plugs that will cause problems or too tight and cause even worse problems. Also torque per the manufacturer recommendations.

They're NGK spark plugs... what more can one say.

Very happy for original quality

Just what the Doctor ordered. Very good

Justo lo que necesitaba

The spark plugs fit perfectly in my 1983 Honda Shadow 500, and while they each come in their individual boxes, all four are adhered together. If you only need two of them, you'll find yourself cutting two of the boxes apart from the other two. That said, they came pre-gapped perfectly for my bike. I'll continue checking the gap when i put fresh ones in, but i havn't had to adjust any of them. I am more than happy to continue buying these, especially at the price i purchased them at.