NGK Iridium Plugs#7803/DPR7EIX-9 - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 06-25-2010, 03:22 PM Thread Starter
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NGK Iridium Plugs#7803/DPR7EIX-9

I went shopping for the above plugs today; here are the results.

Advance Auto: 6.99 ea. none local, 11 ea in Atlanta Area; did not offer to
have them shipped to the local store.

AutoZone: Do not carry this item


NAPA: They have them in stock in Sylvester,GA; Must pay for them before they will have them shipped; Price: $9:XX each plus tax.

Oreilly Auto Parts: Ordered 4 today at 3:00 P.M.; can pick up tomorrow after 11:30 AM; $6.49 each plus tax; Total of 27.78. No prepay, just come by and pick them up.
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post #2 of 8 (permalink) Old 06-25-2010, 03:30 PM
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I have to ask. What is the difference between the Iridium plugs as apposed to the factory NGKs? Hotter spark? I have what the factory suggests and don't see anything wrong with them.

Need info before I dump $25 or $30 for 4 plugs.

Its like the Dyno oil apposed to Synthetic oil discussion. haha

01' VN750
Jardine cross over exaust
Kyriakin grips and foot pegs
Modified seat and backrest
Windshield
Luggage rack
Crash bar with Kyriakin pegs and extensions
Kumho 758 165/80-15 CT rear Dunlop 404 110/90-19 front
Coastered and air/fuel screws at 2.5 turns
Spline lube

93' VN750 getting TLC
Decals and mirrors
Coastered and air/fuel screws at 2.5 turns
ACCTs to MCCTs
Degoated with Harley mufflers
Duro 110-90-19 front 150-90-15 rear
Pick-up coils at .020
Spline lube
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post #3 of 8 (permalink) Old 06-25-2010, 03:47 PM
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I believe I'm right when I say hotter spark in all conditions and they last 100,000 miles. May be the last plugs you ever need to buy, so not a bad investment. Be sure to lube the plugs with anti seize, 'cause you may leave them in a good long while!

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts
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post #4 of 8 (permalink) Old 06-25-2010, 04:10 PM
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Thanks flite.
I'll look into them if they run for 100k. My cousin gets a discount at a couple auto parts stores so maybe I can get them a bit cheaper.

01' VN750
Jardine cross over exaust
Kyriakin grips and foot pegs
Modified seat and backrest
Windshield
Luggage rack
Crash bar with Kyriakin pegs and extensions
Kumho 758 165/80-15 CT rear Dunlop 404 110/90-19 front
Coastered and air/fuel screws at 2.5 turns
Spline lube

93' VN750 getting TLC
Decals and mirrors
Coastered and air/fuel screws at 2.5 turns
ACCTs to MCCTs
Degoated with Harley mufflers
Duro 110-90-19 front 150-90-15 rear
Pick-up coils at .020
Spline lube
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post #5 of 8 (permalink) Old 06-25-2010, 04:11 PM
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I use the non-resistor type (DP7EIX-9) and gap them out to 0.045" and it runs great. Use the energy for the spark instead of resistance in the plug. No radio to worry about anyway.

No black magic here, the iridiums are better. The oil thing is a completely different story.

Jon

93VN750, under re-construction
vn750.com Member # 828

Rick's Stator and R/R
MF AGM Battery
Coastered
Degoated
Shaved & Jetted
Iridium's
MAC Tapered Staggered Pipes
Battery/Temp/Clock Gauge
Stainless Steel Brake Lines
Dunlop D-404's
23,XXX miles and holding pending gasket change (underway!!!)
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post #6 of 8 (permalink) Old 06-25-2010, 04:15 PM
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Also good to know 93. I run mine around 0.036" gap split the difference from the manual recommendations.

01' VN750
Jardine cross over exaust
Kyriakin grips and foot pegs
Modified seat and backrest
Windshield
Luggage rack
Crash bar with Kyriakin pegs and extensions
Kumho 758 165/80-15 CT rear Dunlop 404 110/90-19 front
Coastered and air/fuel screws at 2.5 turns
Spline lube

93' VN750 getting TLC
Decals and mirrors
Coastered and air/fuel screws at 2.5 turns
ACCTs to MCCTs
Degoated with Harley mufflers
Duro 110-90-19 front 150-90-15 rear
Pick-up coils at .020
Spline lube
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post #7 of 8 (permalink) Old 06-25-2010, 10:04 PM
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Because the iridiums provide a better spark, they are much better during "hot start" conditions with the VN750.

It naturally follows that the bike's ignitors don't have to work as hard with the iridium plugs.

My Ford SUV has 145,000 miles on it, and still has the original iridium plugs. The power and gas mileage are the same as when I first got it. The point here is that those are most likely the last spark plugs your bike will need.

Don't necessarily expect better gas mileage with them, though.

'05 VN750



For other bike pix & mods, go to:
http://s1203.photobucket.com/albums/...k/VN750%20pix/
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post #8 of 8 (permalink) Old 06-26-2010, 06:51 AM Thread Starter
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Iridium Plugs

My experience so far with the plug situation has been;

My bike will develop a slight skip at low speed or while idleing; The voltmeter will be indicating less than 12 volts. As the engine speed increases and the voltage increases the skipping will go away.

I can clean the plugs with an abrasive plug cleaner and they will run fine for a couple of hundred miles and then the problem will reoccur.

Everything I have been able to find on the NGK Iridium is: requires less voltage to spark; design is self cleaning; contact material is much harder and less wear is experienced.

They do not save energy as some on here have stated; they just operate at a much lower voltage than the standard plug. Thus; available voltage at the lower engine speeds; due to the load on the electrical system; i.e., Fan, Lights, Tach, etc., does not affect the operation to the degree it does on the standard plug.

The output of the ignition coil is directly proportional to the amount of the input. Therefore the lower the input voltage; such as starting or low speed idle decreases the available voltage to the coil; thus the lower output voltage to the plug; then the condition of the plug and the gap determine what level of voltage is required to generate a breakover/ spark.

Also, the Resistor component of the plug may or may not be important; but most vehicles that use computers to control the ignition rather than the old style points; require them to prevent interference with the ECU.

Just my .02.
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