NGK Iridium Spark plugs don't fit??? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 5 (permalink) Old 11-10-2013, 04:24 PM Thread Starter
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NGK Iridium Spark plugs don't fit???

Hey all, it came time for me to change my plugs, and based on the recommendations all over the forum I went down to Advance Auto and sprung for a set of NGK iridium plugs. I was sure to get the exact part number everyone else cited (DPR7EIX-9), but when I got back home I pulled the first plug out of the box and it was obvious that it clearly doesn't fit the bike. Specifically, the post is too large for the terminal- in fact it looks like a completely different type of connection.

My bike is an '04 vn750, one previous owner. Is there some kind of variance on the electrical systems in these bikes that could explain the different posts? Did NGK change their plugs? Could it be that the previous owner d*cked around with the electrical system and changed the terminals? If anyone can shed some light on this it'd be much appreciated.

This eBay page with the plugs for sale actually shows exactly what I'm talking about. If you view the full description, you'll see 2 pictures of the plugs. The first picture (where the plug is vertical), you can see the type of post that my old plugs have and fit the bike. The 2nd picture, (where the plug is horizontal) you can clearly see a completely different post, which is what is on the plugs I just bought. What gives???

Last edited by bluguitar89; 11-10-2013 at 04:30 PM.
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post #2 of 5 (permalink) Old 11-10-2013, 04:35 PM
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You just unscrew that connection off. If it's hard use some pliers.

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
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1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

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1989 Pontiac Firebird Formula 350
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post #3 of 5 (permalink) Old 11-10-2013, 04:46 PM Thread Starter
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Thank you. I am an idiot
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post #4 of 5 (permalink) Old 11-10-2013, 07:29 PM
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Originally Posted by bluguitar89 View Post
Thank you. I am an idiot
Don't feel bad because that exact issue was addressed on this forum once before from someone else thinking as you did that they were the wrong plugs.

and always remember, "Ride until you rot!"
**Really not sure if the Big "C" is back right now
but having to face the fact that this is a lifetime routine
going forward. Five operations done and it still continues.

Vulcan 2000
New ride: 2009 Victory Vision Arlen Ness Signature Series
4507 miles
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post #5 of 5 (permalink) Old 11-10-2013, 07:44 PM
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Yes. Don't feel bad. Your just one in a long line of "idiots" that had the same problem. There is no instructions packed with the plugs to let you know the tips screw off.
Luckily you came here and were clued in before you went ballistic on some poor guy at Advance Auto for selling you the wrong plug...

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