Iridium Plugs, Wow! - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 41 (permalink) Old 02-06-2007, 04:37 PM Thread Starter
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Iridium Plugs, Wow!

I don't recall if I mentioned here that I was having some cold starting issues, but when it's been in the 20's or 30's, especially if it's been wet out and I haven't ridden for several days, the bike was getting harder and harder to start. I'd crank and crank and sometimes felt like I was going to run the battery down (MF) before it would fire up. Then it ran fine and started fine around noon when I'd go out to leave for lunch. I finally bought the iridium plugs and installed them. I immediately took it for a ride and maybe (subconciously) it felt like it had a little more power and ran smoother. That night the cold hit and we had ice and sleet and rain/freezing rain for several days, so I didn't get to ride for nearly a week. First dry (but cold 28 degree) morning, I decided to ride again. Went out and pulled on the choke and it fired on the first touch, but died. I hit it again and it fired right up and warmed up nicely. It's fired on the first touch every since. The new plugs made that issue go away. It could be that any new plugs would have made that difference, but the old plugs looked fine, not carboned up or anything that would suggest why I was having that problem.

If you're having starting issues, and have an MF battery, and the bike runs fine otherwise, I'd suggest the iridium plugs. NGK part 7803. I'm sold on them!

Fergy
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post #2 of 41 (permalink) Old 02-06-2007, 05:05 PM
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What brand were your previous plugs? How many miles (approx) did you have on them???....
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post #3 of 41 (permalink) Old 02-06-2007, 05:10 PM
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what gap are you running, what did u use to measure it?

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post #4 of 41 (permalink) Old 02-06-2007, 06:18 PM Thread Starter
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Previous plugs were NGK. I'm pretty sure they were original plugs. Had 17,000 miles on them. I checked the gap with feeler gauge, but they were all four already at .035 so I left them there.

Fergy
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post #5 of 41 (permalink) Old 02-06-2007, 08:29 PM
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Cool

Thats quite a few miles on those plugs.New plugs whatever ones that you use will make a considerable difference. But Im glad you got it straightend out.....................
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post #6 of 41 (permalink) Old 02-07-2007, 05:47 AM
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Iridium plugs....I got 'em too

I have to say that my bike starting has changed drastically since I put the Iridiums in it. The bike had about 6k and I am sure the plugs were changed out previously to me getting the bike (the old ones were in with the tool kit in the tool box). Anyway, cold starts are great, but what I like even better is the warm start backfire is gone. It was to the point where I refused to shut the bike off if I was going to start it right back up because of the embarrasing KA-POW!!!

I agree about the power. The bike does feel more responsive with the plugs, though probably my imagination. The plugs are pricey, but supposedly the last plugs you will need to buy. OH- DON'T FORGET NEVER-SEIZE ON THE THREADS!

I bought the NGK plugs with the U-groove. I figured if I was going for it to go all out.

Ben-
SW Ohio

'02 VN750
Pipes drilled
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8000-ish miled
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post #7 of 41 (permalink) Old 02-07-2007, 09:21 AM Thread Starter
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Ben, what's the U-groove?

Fergy
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post #8 of 41 (permalink) Old 02-07-2007, 10:58 AM
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If the "fire in the hole" is that much better with these new plugs, I have to wonder how much they improve fuel efficiency.

Heck, everybody knows that as warm weather comes back, gasoline will (again!...) get expensive....so does anybody know of any proven test data on how these plugs help save gas?
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post #9 of 41 (permalink) Old 02-07-2007, 11:15 AM
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Fergy, what do four of the iridiums run price-wise?

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post #10 of 41 (permalink) Old 02-07-2007, 11:36 AM
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Quote:
Originally Posted by Crobins365 View Post
what do four of the iridiums run price-wise?
Summit Racing has them for $6.99 ea.
I couldn't find a price on the Advanced Auto site.

Also as far as what kind of MPG improvment they make, this was copied from the Vulcan Verses...

Quote:
I had the same experience with these last year, Dennis. Now I just have to barely breathe on the start button and she starts right up. I figured they're well worth the slight extra cost. A lot of us spend way more than that on cosmetic upgrades and shiny chrome bits. I bought mine at Shade Tree for abt $8 ea. They should last longer, and I since I also keep detailed track of my gas mileage all the time, I also noticed an average increase of about 2 MPG after installing them See if you notice the same thing.... -Tim S.


AKA: Tim & 'The Adventure Cycle' VROC #24567, NEVROC, SteelCity VROC


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