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I just replaced the spark plugs in my Vespa PX150 and Genuine Stella scooters, with Denso Iridium Power spark plugs.

Too many good things to say about Densos. You can read all about them on their website:
http://www.densoiridium.com/ir_power.php

They do not need to be gapped.

I found out about them on a Maserati forum. Everyone there is doing it. I will eventually put them in all
my vehicles. Since I was purchasing a lot of different plugs, I bought them all at a good price from:
http://www.sparkplugauto.com/

But, if you just want to try one or two, you can find them on eBay.com or maybe your local auto parts store.

Both scooters now run better than ever. Idling is very smooth. They feel like they have more power, especially
the PX150, which used to bog down climbing hills. The top speed went from 60 m.p.h. to 65.

I'm also anticipating slightly better miles per gallon.

For both scooters, I did not use what the Denso website's "Find My Part" suggests, but instead used their
cross-reference with the spark plug numbers specified in the scooter's owner's manuals.

The Genuine Stella now has Denso IW20, part 5306.

The PX150 now has Denso IWF22, part 5379.

My Vespa Granturismo already has an NGK Laser Iridium I bought from scooterwest.com. That won't need to
be replaced for quite a while. Iridium plugs last a lot longer than regular plugs. Typically 10,000 miles.

Another good spark plug cross-reference is http://www.sparkplug-crossreference.com/

I also put a dab of dielectric grease on the spark plug post connecting to the wire.

Since this is an inexpensive upgrade for any scooter, I suggest everyone try a Denso. Since you only have one
spark plug, you may as well use the best. You will not be disappointed.
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Yes
This was a item I had the dealer install before delivery

Very good insulator's, never crack

The plating is perfect for corrosion

I just wish they made aviation plugs

GB
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I don't want to resurrect the whole resistor vs non-resistor topic but...
I don't see anywhere on the Denso site any reference as to whether or not their recommended ones are resistor plugs.
Vespa specifies a resistor plug for the PX 150.
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Aiosi wrote:
I don't want to resurrect the whole resistor vs non-resistor topic but...
I don't see anywhere on the Denso site any reference as to whether or not their recommended ones are resistor plugs.
Vespa specifies a resistor plug for the PX 150.
Non-resistor plugs are easily cured with a resistor plug cap.

Use one or the other, but never both.
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Aviator47 wrote:
Non-resistor plugs are easily cured with a resistor plug cap.

Use one or the other, but never both.
But they don't say whether or not they are resistor.
I guess that means I should "assume" that they are not.
And why wouldn't Denso tell you that their suggested plug do not meet the manufacturers specifications?
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Aiosi wrote:
Aviator47 wrote:
Non-resistor plugs are easily cured with a resistor plug cap.

Use one or the other, but never both.
But they don't say whether or not they are resistor.
I guess that means I should "assume" that they are not.
And why wouldn't Denso tell you that their suggested plug do not meet the manufacturers specifications?
This web site says that the Denso IW24 (Iridium) is compatible with the NGK BR8-EIX, which is a resistor plug. Does that help?
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I'm using them and rode both scooters for at least 10 miles without a problem.
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I'm a resistor. I refuse to ever spend that much on a plug again. It's a scooter not an aircraft. IMNSHO YMMV WGASA
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Aviator47 wrote:
This web site says that the Denso IW24 (Iridium) is compatible with the NGK BR8-EIX, which is a resistor plug. Does that help?
Nah, not until Denso tells me it is actually a resistor plug.
fullthrottle wrote:
I'm using them and rode both scooters for at least 10 miles without a problem.
I don't know if 10 miles is a long enough ride to determine if you have damaged your CDI. But I don't know.
tomjasz wrote:
I'm a resistor. I refuse to ever spend that much on a plug again.
For me it's not so much the money, I would only be buying 1 spark plug, but I think I will stick with the NGKs for now.
And I think I would prefer to keep my plug cap non-resistor just so I won't have to remember if I changed it or not (senility ain't funny) .
The thought of the additional 5 mph in the origininal post is certainly intriguing to me but I don't want to risk it without some reassurance.

For the OP here is the discussion that is causing all this angst in me
The new Vespa px..what a nightmare
Just the parts that pertain to the non-resistor plug damaging the CDI are what I am referring to. I can't vouch for the rest of the issues presented there.

Disclosure: I warn you, if you read that post you may come away from it feeling like you are 5 years old and just watched your parents have a really nasty argument.

Now how about a serious issue...
What would be the best 2T oil to use with the Denso plugs and do I have to wear a helmet with them? Razz emoticon
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You should check the gap and re-gap if needed. Here is how to gap Iridium plugs
https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxzMjAwMGRvY3N8Z3g6NGUxY2FlNmNkNTQwMjc1OQ

Just use the right tool and don't put ANY sideways pressure on the center electrode.

I won't have a vehicle without Iridium plugs, they will outlast my wife's MP3 and still get her better mpg with better performance to boot.
I've used Iridium plugs in everything from scooters to supercharged drag engines. One of the best things you can do for a car, boat, motorcycle or scooter. I use NGK because they are easier to find here in the states.

ROD
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Aiosi wrote:
For me it's not so much the money, I would only be buying 1 spark plug, but I think I will stick with the NGKs for now.


Disclosure: I warn you, if you read that post you may come away from it feeling like you are 5 years old and just watched your parents have a really nasty argument.

You pegged it. Another of those super silly arguments that end badly over nothing but stubborn opinions. Now about that oil, there is only ONE any sensible...
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From the Denso website:
"Before attempting to gap any DENSO Iridium Power spark plug, please review the specification chart in the front of this catalog to verify the factory-preset gap. In most cases your Iridium Power plugs do not need to be gapped. Even with small variations in the factory set gap the ultra-efficient firing power design will compensate for those small variations.

Should you decide to re-gap your Iridium Power plug, use extreme caution as improper gapping may damage or destroy the Iridium center electrode."

And then it goes on to explain how to gap them.

I didn't gap the ones I used. Didn't even bother to check the gap. I just dropped them in, and they worked flawlessly.
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UTC quote
Aiosi wrote:
Aviator47 wrote:
This web site says that the Denso IW24 (Iridium) is compatible with the NGK BR8-EIX, which is a resistor plug. Does that help?
Nah, not until Denso tells me it is actually a resistor plug.
Then if you are considering a change to Iridium plugs, go to their web site and click on "contact". Unfortunately, they actually have the following disclaimer there!
Quote:

DUE TO THE HUGE VOLUME OF INCOMING CORRESPONDENCE, WE ARE UNABLE TO ANSWER ALL EMAILS AND PHONE INQUIRIES. WE DO NOT OFFER DESIGN AND TECHNICAL SPECIFICATIONS, O.E. INFORMATION OR TUNING ADVICE.
Or, stay happy with your current performance with the "stock" plug. I am.
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UTC quote
Do I have to deal with crying babies if I purchase these First Class priced spark plugs? If so, I'll just stick with my Coach Class Autolite plugs. Laughing emoticon

-Craig
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You should be able to find Densos for less than 8 bucks a piece. Check eBay or the website I mentioned. http://www.sparkplugauto.com/
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caschnd1 wrote:
Do I have to deal with crying babies if I purchase these First Class priced spark plugs? If so, I'll just stick with my Coach Class Autolite plugs. Laughing emoticon

-Craig
you win the internets today, sir.

well played, well played.
/doffs cap

-g
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$
Next time I need some I will get a case from The Dist and advise cost
so you cant complain about the price....

You get what you pay for...

Why be negative here ?

its just money enjoy it, your not taking it with you


Happy New Year to all
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fullthrottle wrote:
You should be able to find Densos for less than 8 bucks a piece.
MV expert tells us the interwebs are full of cheap fake plugs which may or may not cause
  • Higher fulel consumption
  • Turns dino oil into synthetic
  • Lower gas milage
  • Front wheel wobble
  • Decreased fuel tank range
  • Unimaginable engine damage
  • Turns synthetic oil into dino
  • Rear wheel shimmy
  • Drops your octane by 3 points
  • Turns your rollers backwards while you're not looking.
Order online at your own risk.
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I seriously doubt that.

Advance Auto Parts sells Densos, if you're worried about it.
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tomjasz wrote:
I'm a resistor. I refuse to ever spend that much on a plug again. It's a scooter not an aircraft. IMNSHO YMMV WGASA
Half the value of the more expensive plugs (as well as many other items) is the fun involved in determining how much better they work, so just consider it entertainment expense.
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Aviator47 wrote:
tomjasz wrote:
I'm a resistor. I refuse to ever spend that much on a plug again. It's a scooter not an aircraft. IMNSHO YMMV WGASA
Half the value of the more expensive plugs (as well as many other items) is the fun involved in determining how much better they work, so just consider it entertainment expense.
Agree! I enjoy doing this sort of experimentation. And when you are talking about a single cylinder engine, you're not talking about much money at all (less than the cost of lunch). But you can't take out an old worn out plug and replace it with an iridium plug and use that for comparison. You need to compare new vs. new. And I'd really like to see dyno charts of iridium vs. stock.

-Craig
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caschnd1 wrote:
You need to compare new vs. new. And I'd really like to see dyno charts of iridium vs. stock.

-Craig
I suspect that would take out half the fun out of it.

Of course, it's interesting that the only "technical info" they offer on their web site begins with:
Quote:
Approximately 50 million years ago an asteroid, some 10km in diameter slammed into what is now Mexico's Yucatan Peninsula near the town of Chicxulub. The resulting dust cloud destroyed most living things and ended the dinosaurs reign on earth.
And goes on to expound on the results of that event, yet contains nothing about better performance, or performance at all. Perhaps they are more interested in "dinos" than "dynos".

I would add that NGK's web site makes no claims of improved power for any of their three iridium products, but simply claims, "slow wear rate providing stable idle, superior anti fouling, improved fuel efficiency and lower emissions"
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I replaced a fairly new standard Champion spark plug with a Denso Iridium plug and noticed the difference in power immediately. Greater acceleration, climbs hills better, and higher top speed on the PX150.

What make the Denso unique and superior to other plugs, even other iridium plugs, is that they have the finest electrode at .4mm. And, the ground electrode is a U-shape, which spreads the flame nucleus instead of crushing it, or more even combustion.

see: http://www.densoiridium.com/spconstruction.php
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fullthrottle wrote:
I replaced a fairly new standard Champion spark plug with a Denso Iridium plug and noticed the difference in power immediately. Greater acceleration, climbs hills better, and higher top speed on the PX150.

What make the Denso unique and superior to other plugs, even other iridium plugs, is that they have the finest electrode at .4mm. And, the ground electrode is a U-shape, which spreads the flame nucleus instead of crushing it, or more even combustion.
Balderdash.

If a spark plug ignites the mixture reliably (which a standard plug will do if in good shape and gapped correctly), there is nothing to be gained performance-wise from other designs.

FWIW, I use iridium plugs, but I use them for longevity, which is where their only advantage lies. They offer no improvement in performance over a properly gapped standard plug in good shape.
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I disagree. The proof is in the riding experience.
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Another of those stories I tend to believe but find it odd that there never is any data. I'm with Craig, I'd like to see some numbers on a dyno chart. I practiced a number of anecdotal procedures in my palm culture. I know what I saw regardless of the nay sayers. Today some of those practices are considered mainstream. In this case I am slightly more suspicious given the number of PTW's and the total lack of any data. BTW I also run an Iridim plug, for the same reason as Silverstreak.
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There is graphical data on the back of a 4 pack of Densos.

.7 seconds better acceleration to 150 km/h.

better fuel economy. 6 miles more out of 805 miles compared to 799 miles.
and
2.23/hr compared to 2.27/hr with a 1600 cc motor. (units must be gallons it doesn't say).

Also, the melting point of iridium is higher than platinum or nickel. Iridum plugs run cooler.

Small differences, sure. But, I'll take it. Especially if I don't have to clean and re-gap plugs anymore.
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I tend to be wary of companies blowing their own horn. But your point is well taken.
Forum member supplied image with no explanatory text
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I just went for a short ride on the PX150 again, to be sure I wasn't imagining things yesterday.

I definitely feel a difference. More powerful acceleration and very smooth idling. I didn't take it up to the top speed again, but yesterday that was 5 mph more than ever before on a level straightaway.

Some might say it's just because I have new plugs and any new plug is going to feel better. But, I'm telling you I've had this scooter for 5 years and it's never run this good, even with new conventional Champion plugs.

My gut tells me that any small change in a small engine is going to make a bigger difference than small changes in bigger engines. Even so, I'm going to put Densos in all my vehicles eventually.
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I wish I was riding a PX150 on New Years day! Good on you!
Happy New Year!
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Thank you. Happy New Year everyone!
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fullthrottle wrote:
There is graphical data on the back of a 4 pack of Densos.

.7 seconds better acceleration to 150 km/h.

Wow, my PX 150 only accelerates to 90 kmh.

Scan it and post it please.

I agree with Silver Streak, and so do the tech claims of NGK and Champion.
⚠️ Last edited by Aviator47 on UTC; edited 1 time
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fullthrottle wrote:
I just went for a short ride on the PX150 again, to be sure I wasn't imagining things yesterday.

I definitely feel a difference. More powerful acceleration and very smooth idling. I didn't take it up to the top speed again, but yesterday that was 5 mph more than ever before on a level straightaway.

Some might say it's just because I have new plugs and any new plug is going to feel better. But, I'm telling you I've had this scooter for 5 years and it's never run this good, even with new conventional Champion plugs.

My gut tells me that any small change in a small engine is going to make a bigger difference than small changes in bigger engines. Even so, I'm going to put Densos in all my vehicles eventually.
Believe what you like. I'm an engineer, and I tend to believe only independently conducted, well-controlled tests -- not butt dynos or manufacturers' hype. Show me a dyno test conducted by someone competent with no financial interest in the outcome between a new Denso plug and and a new, properly gapped standard plug in the same vehicle with everything else being equal.

Butt dynos are notoriously affected by wishful thinking.
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Butt dynos? They indicate smaller or bigger?
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tomjasz wrote:
Butt dynos? They indicate smaller or bigger?
No, but the larger the butt dyno -- generally -- the poorer the performance. Razz emoticon
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Butt bigger means wider sound range.
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Silver Streak wrote:
I'm an engineer,
But are you a butt engineer?
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This shop puts nothing in the bikes they work on but NGK Iridium plugs. They have yet to lose any power but they do gain HP after a simple plug change no matter how new the plugs were.


You can find hundreds of car and bike shops that will say the same thing, but try to find shops that can show proof that Iridium plugs don't work.

My Honda VT1100-T that I've put 84k miles on, gets better fuel mileage now with Iridium plugs that have 30k + miles on them than I ever got with a new or old standard NGK plug. I do check my gas mileage with every tank of gas I run(do the same thing for the cars too).

ROD
@breaknwind avatar
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Ossessionato
Red Devil SH150i (10,000)
Joined: UTC
Posts: 3254
Location: Orange Park Florida
 
Ossessionato
@breaknwind avatar
Red Devil SH150i (10,000)
Joined: UTC
Posts: 3254
Location: Orange Park Florida
UTC quote
Now that's some tasty puddin 8)
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Hooked
Gts super 300 '12
Joined: UTC
Posts: 329
Location: Seattle Washington
 
Hooked
Gts super 300 '12
Joined: UTC
Posts: 329
Location: Seattle Washington
UTC quote
I find this topic to be very entertaining. I wanna see actual proof those plugs do what they claim or I'm calling shenanigans
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