Spark plugs?

Yamerhaw · 04-11-2009, 10:46 AM

What kind of spark plugs do you run in your bike? I just use whatever came in the bike, but is there something better that will make a noticeable improvement?, getting ready to change them, and thought i might try something else, i've heard real good things about E3 plugs?

askmrjesus · 04-11-2009, 11:19 AM

Tons of bullshit spark plug claims out there, most are just that, bullshit.

Stock works just fine, unless you've changed something.

If you've added a complete exhaust system, you may want to drop a couple of heat ranges to keep head temp down, but other than that- it's a spark plug- as long as a spark comes out one end, you're good.

I have indexed plugs on two strokes, (adding washers to get the plug gap to face the intake ports) but I wouldn't recommended it on an I4, unless you have a dyno, and shit loads of time of your hands. Even then, you'd be lucky to get 1HP for every 100HP you started with.

JC

marko138 · 04-11-2009, 12:10 PM

I use Harley-Davidson 10R12A. Those probly won't work for you.

TommyHotWheel · 04-11-2009, 12:16 PM

Brisk or NGK Iridium...and I index all of my plugs, its an OCD type thing.

Amber Lamps · 04-11-2009, 02:00 PM

Quote:

Originally Posted by TommyHotWheel

Brisk or NGK Iridium...and I index all of my plugs, its an OCD type thing.

I thought about Brisk but for the money,I ended up with NGK Iridium.

racedoll · 04-11-2009, 02:18 PM

I use NGK.

askmrjesus · 04-11-2009, 04:29 PM

Quote:

Originally Posted by TommyHotWheel

I index all of my plugs, its an OCD type thing.

Yes, but which way do you point them?

"Conventional Wisdom" dictates that you point the gap toward the intake (so the ground strap doesn't block the air/fuel mixture) but some engine configurations seem to work better with the gap facing the outlet valves.

JC

Rangerscott · 04-11-2009, 04:55 PM

I put in NGK iridium cause I dont feel like hassling with them for awhile.

A spark plug is only as good as the ignitions source. You can put in the world's most expensive plugs but they will only spark with what can be delivered to them from the coil packs/distributer.

Upgrade your whole ignition system and you will see an improvement.

101lifts2 · 04-11-2009, 05:30 PM

Quote:

Originally Posted by askmrjesus

Yes, but which way do you point them?

"Conventional Wisdom" dictates that you point the gap toward the intake (so the ground strap doesn't block the air/fuel mixture) but some engine configurations seem to work better with the gap facing the outlet valves.

JC

If the thread starting position in the head is the same then in theory the plugs will all be at the same position. It shouldn't matter which way the plug points if the air/fuel charge has swirled enough to make the mixture homogenous.

101lifts2 · 04-11-2009, 04:18 PM

Quote:

Originally Posted by askmrjesus

...If you've added a complete exhaust system, you may want to drop a couple of heat ranges to keep head temp down, but other than that- it's a spark plug- as long as a spark comes out one end, you're good....

Spark plug heat ranges have almost no effect on the actual combustion temperatures unless the plug causes preignition or incomplete combustion.

You should use whatever plug is recommended by the OEM since fuel injected engines can control the A/F ratio in a much narrower range than a carb.

04-11-2009, 10:46 AM	#1
Yamerhaw Country Boy Join Date: Nov 2008 Location: Hicktown in NC Moto: 07 R1 Posts: 797	Spark plugs? What kind of spark plugs do you run in your bike? I just use whatever came in the bike, but is there something better that will make a noticeable improvement?, getting ready to change them, and thought i might try something else, i've heard real good things about E3 plugs? __________________ “If trees could scream, would we be so cavalier about cutting them down? We might, if they screamed all the time, for no good reason.” It takes a big man to cry, but it takes a bigger man to laugh at that man.

04-11-2009, 11:19 AM	#2
askmrjesus Soul Man Join Date: Nov 2008 Location: Everywhere, all the time. Moto: '0000 Custom Turbo Cross (with jet kit). Posts: 6,481	Tons of bullshit spark plug claims out there, most are just that, bullshit. Stock works just fine, unless you've changed something. If you've added a complete exhaust system, you may want to drop a couple of heat ranges to keep head temp down, but other than that- it's a spark plug- as long as a spark comes out one end, you're good. I have indexed plugs on two strokes, (adding washers to get the plug gap to face the intake ports) but I wouldn't recommended it on an I4, unless you have a dyno, and shit loads of time of your hands. Even then, you'd be lucky to get 1HP for every 100HP you started with. JC __________________ The way things are going, they're gonna crucify me.

04-11-2009, 12:16 PM	#4
TommyHotWheel Imported from Detroit Join Date: Nov 2008 Location: Michigan Moto: 2001 Suzuki TL1000R Posts: 989	Brisk or NGK Iridium...and I index all of my plugs, its an OCD type thing. __________________ Cry Havok! And let slip the hogs of war!

04-11-2009, 02:18 PM	#6
racedoll AMA Supersport Join Date: Nov 2008 Moto: '04 Kawasaki ZX6RR Posts: 3,392	I use NGK.

04-11-2009, 04:55 PM	#8
Rangerscott Viff6N Mutated Warrior Join Date: Mar 2009 Location: Texas Moto: '01 Honda VFR 800 & '09 ER-6N Posts: 8,704	I put in NGK iridium cause I dont feel like hassling with them for awhile. A spark plug is only as good as the ignitions source. You can put in the world's most expensive plugs but they will only spark with what can be delivered to them from the coil packs/distributer. Upgrade your whole ignition system and you will see an improvement.