Spark Plug 91909 Central Electrode - Iridium & 1 Ground Electrode & with Flat Hold-Seal Key Opening: 16 mm

Replaced the NGK LMAR8A-9S (6817) with this and the difference in smoothness and power delivery is tangible. Has the correct Honda spec washer of the LMAR8A-9S (6817), WHICH IS NOT THE LMAR8A-9 (4313) listed both in the 2014 Forza owner's manual and what Amazon confirmed fit says is the correct plug. Spent hours researching why the 4313 plug wouldn't start my bike before I stumbled across this subtle but significant difference. Yeah, for a spark plug it's kinda pricey, but one plug in my bike is not a wallet breaker, and the longer replacement interval and better performance make it a bargain.

Todavía no lo pruebo pero llego en perfectas condiciones

You ever replace a spark plug and actually feel your soul ignite? No? Then you haven’t met the NGK Lazer Iridium—the plug so elite, it doesn’t start engines, it summons horsepower from the netherworld. Right out of the box, it radiates superiority. I mean, come on—Lazer? Iridium? This isn’t a spark plug, it’s a Marvel weapon disguised as engine tech. I half-expected Tony Stark to pop out and install it for me. But nope—just me, my wrench, and the sudden feeling that my ride was about to light up the world like Times Square on caffeine. Once installed? Instant combustion bliss. Cold starts? Now hotter than my ex’s temper. Throttle response? So crisp it deserves its own ASMR channel. Idle? Smoothed out like it just got a Swedish massage. My engine hasn’t felt this fired up since factory testing. Let’s not forget that iridium isn’t just a fancy name. This metal is rarer than a sincere tweet and tougher than a $2 steak. It laughs at wear, scoffs at carbon, and sparks joy (and combustion) like it’s on a mission from the ignition gods. Old plug? It’s in the trash now, right where it belongs—grounded for life. That thing used to “spark” but in a sad, wheezing birthday candle kind of way. The NGK? It ignited my faith in internal combustion. My engine now purrs like it just got a promotion. Bottom line: if you’re still running anything else, you’re shorting out your own joyride. This plug didn’t just complete the circuit—it set my whole driving experience ablaze. Five stars. Would spark again.

Bought for 2018 yamaha wolverine and it runs as good as new. Had noticed idling issues recently and decided to start troubleshooting at the plugs. Worked great!

Great replacement for the original (non-iridium) NGK/LMAR8A-9 for my 2019 Yamaha XMAX 300. The bike seems to start easier and rev faster/has more throttle response vs the old plug. Yes this iridium plug is a lot more expensive than most (probably the most expensive single spark plug I have ever purchased), but I would say it's worth it.

Utv runs better than new

I'd rate them higher, but only used them for a short time so far.

I run these in my Yamaha 2020 Wolverine X2 Xt-r. Much better than the normal stock plugs. Just bought these to have an extra set when I change out the first ones.

perfecto pero algo caro

La compré para la CFMoto 450 MT y le quedó perfectamente.

Die NGK Iridium Zündkerze überzeugt durch ihre erstklassige Verarbeitung und die gewohnt hohe Qualität des Herstellers. Iridium-Zündkerzen wird allgemein eine effizientere und stabilere Funkenbildung im Vergleich zu herkömmlichen Zündkerzen nachgesagt, was sich positiv auf die Verbrennung auswirken kann. In der Praxis arbeitet die Zündkerze absolut zuverlässig und erfüllt ihren Zweck einwandfrei. Der Motor läuft sauber und ohne Auffälligkeiten. Ob sich darüber hinaus spürbare Veränderungen im Fahrverhalten ergeben, lässt sich subjektiv schwer beurteilen – funktional gibt es jedoch keinerlei Kritikpunkte. Fazit: Hochwertige Zündkerze mit zuverlässiger Leistung und langer Lebensdauer. Eine klare Empfehlung für alle, die auf Qualität setzen.

Molto Buona , un po cara

Parfait pour remplacer mes bougies classiques de ma tenere 700 2019 Fonctionne parfaitement