Spark Plugs - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 16 (permalink) Old 03-14-2012, 09:56 AM Thread Starter
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Spark Plugs

I just bought 4 NKG DP8ea9 plugs........ Can these be used, or should I go and repalce them for DP7ea9 as per the manual. ?

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post #2 of 16 (permalink) Old 03-14-2012, 10:09 AM
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You could run them, but if you haven't used them see if you can swap them for the 7's. If the plug is too cold, there will be deposits on the nose of the plug. What did your old set look like? If you don't have any oil or carbon fowling you should be ok with the colder plugs.
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post #3 of 16 (permalink) Old 03-14-2012, 10:42 AM
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I would go with Iridium #7803 DPR7EIX-9 first. If not go with DP7EA-9. Advance Auto had Iridiums at $6.99 each

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post #4 of 16 (permalink) Old 03-14-2012, 09:00 PM
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Originally Posted by JM2001 View Post
I would go with Iridium #7803 DPR7EIX-9 first. If not go with DP7EA-9. Advance Auto had Iridiums at $6.99 each
X2^^^^^^^^^
Get the NGK Iridium DPR7EIX-9 plugs.
They will probably outlive the bike!!

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post #5 of 16 (permalink) Old 03-14-2012, 09:15 PM
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Originally Posted by OlHossCanada View Post
X2^^^^^^^^^
Get the NGK Iridium DPR7EIX-9 plugs.
They will probably outlive the bike!!
Seconded.

They woke my bike up! Old plugs couldn't even get her started, and she roars to life first push of the starter now.

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post #6 of 16 (permalink) Old 03-19-2012, 07:32 PM
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Per/on topic-off topic.......has anyone running too rich ever tried running "6s" instead of the 7's ?...after my Harley muffs, Im running a hair rich. Tried the gap-closing trick to get a hotter spark, but they tended to just foul then. Suppose the worst that could happen is melting holes in the top end, eh ?



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post #7 of 16 (permalink) Old 03-19-2012, 07:37 PM
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Per/on topic-off topic.......has anyone running too rich ever tried running "6s" instead of the 7's ?...after my Harley muffs, Im running a hair rich. Tried the gap-closing trick to get a hotter spark, but they tended to just foul then. Suppose the worst that could happen is melting holes in the top end, eh ?
If you are running rich, you need to fix it by adjusting the carbs, not the plugs.

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post #8 of 16 (permalink) Old 03-19-2012, 09:39 PM
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Quote:
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Per/on topic-off topic.......has anyone running too rich ever tried running "6s" instead of the 7's ?...after my Harley muffs, Im running a hair rich. Tried the gap-closing trick to get a hotter spark, but they tended to just foul then. Suppose the worst that could happen is melting holes in the top end, eh ?
A slightly rich mixture tends to increase power; however, it also increases fuel consumption and exhaust emissions. An overly rich mixture, 8:1, will reduce engine power, foul spark plugs, and cause incomplete burning (black smoke at engine exhaust). But really no damage to the engine unlike a really lean mixture, 20:1, would cause due to the high heat. Ideal mixture is 15:1.

If you really wanted to, you could take it to a shop and have them test the exhaust gases.
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post #9 of 16 (permalink) Old 03-20-2012, 10:01 PM
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take it to a shop and have them test the exhaust gases
NEVAH !!!!!...I only hit the shops for parts and inspections, lol...I'll just get a set of Irridium 7's...carbs seem to be where they need to be...just looked like a weak spark when I tested (visual spark test).
Have no popping/backfiring and MPG is about 58 if I ride nice and in the flats.....I mighta worn out the old plugs from all the adjustments/mods ive done in the last few months.
I just asked about the 6's because thats what we did when I was racing motocross with my Bultaco and it ran rich (went hotter)...that was a 2 stroke though with premix...



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post #10 of 16 (permalink) Old 03-28-2012, 11:35 PM
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NGK Iridium DPR7EIX-9 plugs= These are the plugs I got today, my plug wires will not fit them. Do I need to get special plug wires to go with the larger tipped end, and which ones do I get? Thanks.

1986 Vulcan 750
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Sprayed U-joint with Liquid Wrench White Lithium Grease- $3.99 Autozone Pt.# 828796
Castrol Hypoy C 80w90 Gear Oil $5.99- Autozone Pt.#991558
NGK Iridium IX Spark Plugs, $8.99(x4)=$35.96 Autozone Pt.#088394.
Degoated
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