Spark plugs/starting/back firing - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 5 (permalink) Old 06-15-2012, 11:55 PM Thread Starter
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Spark plugs/starting/back firing

FYI this is my recent experience. When I stopped and filled up with gas my bike would occassionally back fire, rather loudly. Plus it seemed on hot days I would have trouble stalling at stops. Well, I figured a had a gas mixture/carb issue/venting problem.

Well, I finally got around to installing some new spark plugs since I bought my Vulcan with 12K miles on her and she now has 21k and counting. Wow what a difference. Wish I would have done this earlier. She always started pretty good except sometimes after I had been riding a while she would be fickle. Well not anymore! Plus no more backfiring and she rides with a little more umph at higher speeds. Just thought I'd share. Don't wait like I did. Put the plugs in! The sooner the better! Good riding!

NGK iridium DPR7EIX-9

Thanks to all you posters providing advice!!!

1986 VN 750
20,000 miles
MF Battery
Replaced Stock Turn signals
Starter Clutch
NGK plugs
MT66 Pirelli's
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post #2 of 5 (permalink) Old 06-16-2012, 08:16 PM
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You have learned well Grasshopper......

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post #3 of 5 (permalink) Old 06-17-2012, 07:04 PM
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I wish I had taken a picture of one of the plugs that came out of mine. 13k miles and I pulled champions out of it. The fronts were fine but the backs were carbon fouled, the deep one had no bottom electrode at all. After some carb work a couple of weeks ago I pulled the NGK ones today and the looked just perfect. It sure it's nice fixing it yourself and making it run well.

4/12/12 1st bike ever! 95 VN 750 13k
New plug wires
Coil relay mod
MCCT mod
EPA stuff removed
Rear signals shaved
Shinko 170-110 oversized tourmaster tires
Splines lubed
Front signals relocated.
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post #4 of 5 (permalink) Old 06-17-2012, 11:01 PM
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I put Iridium plugs in mine today and ended up having to adjust the idle down. The old plugs looked fine. I'm curious to see what they do for gas mileage. Not that 55 was bad by any means.

2006 VN750
21,000 Miles
Splines lubed with Moly 60
Deka ETX15L AGM Battery
NGK Iridium plugs
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post #5 of 5 (permalink) Old 06-18-2012, 10:59 PM
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I run stocks and they run fine...easy starting, no backfiring and 58 mpg out of a 1985....but then again, I spent a lot of time properly ballancing fuel/air/exhast...not all can "just do that"...its trial and error, and a lot of for those who dont have the time or know how, iridiums are a must...

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