Resistor and non-resistor plugs

marinatlas said:
What is the difference between IW22 and VW22 ?
Click to expand...
My understanding is the VW22 has platinum plated electrode - looks like it includes all of the "ground" metal is plated.
The IW22 does not.
If you're running two coils it will make no difference.
Cheers
 
I was happy to see the Fluke meter shown in the video. I worked in product development on that meter when I worked at Fluke. Rest assured it's a good one.
 
"Four Denso VW22s just arrived - equivalent, but better spec, to NGK BPR7EIX."


The rare earth electrodes will maintain their gap longer - which is a good thing as far as maintenance/emissions is concerned but in a ton of dyno tests we never found any difference in engine power between spark plugs of different electrode material.
 
I’ll play :)

Timely post. I recently purchased 4 BPR73ES 2023 cheaply from eBay:


Bike has been running just fine with them but I thought I’d test them and the ones installed on my cNw build by Matt before the bike left the US earlier this year.

My 4 have both the batch number stamped and the ngk website printed on the box. Matt’s has a different batch number as I would have expected.

All of them measure between 4.43 - 4.79 k ohm so presumably I’m good and at £12.90 for 4 I’m happy too.
 
Café au Lait said:
So how do you interpret that then Rob? They appear unused, is that a good thing?
Click to expand...
What's not really evident in the photo is:
1. The centre, ground electrode has slight mid-light grey deposit - I see that as good.
2. The metal body of the plug is clean, almost no deposit - not sure what to think, certainly not bad.
3. The ceramic is almost spotless - again, unsure, but I don't think bad.

It will be interesting to see how things look after a couple of thousand miles.
Cheers
 
I believe the Denso 22 is slightly hotter than a NGK 7, I know my W22 EPU Run cleaner, So the clean burn is likely on a briskly driven bike that is well tuned. I like the construction of the NOS ND plugs I just brought.
 
BrianK said:
I pulled the plugs, also NGK BP7ESs (or sold and labeled as such, anyway) in my '72 Guzzi Eldorado today. One ohmed out at 150 ohms, and the other at 7.4 kilo ohms. Replaced with two from my stock that ohmed out correctly to near zero ohms (my multimeter has 0.1-0.2 of internal resistance), and I had to go through four to find those two.... binned the old ones and the non-conforming new ones. Airhead is next.

Funny, I thought I had enough BP7ESs in stock to last a lifetime but I'm running through them at quite a clip....
Click to expand...
...and, very few miles later the bike started misbehaving - basically, felt like running out of gas then turning on reserve tap, momentary loss of power then a surge as it kicks back in. Thought maybe bad gas but no.

Took out those nearly new plugs and one was black. Ohmed out at something ridiculous, I forget what but waaaaay above its original 0.1-0.2 ohms. So in addition to (I assume fake) NGK plugs that are "bad" right out of the box, apparently you can get some that are fine until you use them a bit.

Very frustrating. I'm a lifetime NGK fanboi but reconsidering my loyalties....
 
Sometimes the centre copper rod in an NGK comes loose in the top terminal.

Then you may see infinite resistance on a multimeter, but the engine is likely to run normally.
 
BrianK said:
...and, very few miles later the bike started misbehaving - basically, felt like running out of gas then turning on reserve tap, momentary loss of power then a surge as it kicks back in. Thought maybe bad gas but no.

Took out those nearly new plugs and one was black. Ohmed out at something ridiculous, I forget what but waaaaay above its original 0.1-0.2 ohms. So in addition to (I assume fake) NGK plugs that are "bad" right out of the box, apparently you can get some that are fine until you use them a bit.

Very frustrating. I'm a lifetime NGK fanboi but reconsidering my loyalties....
Click to expand...
There are FAKE NGK plugs.
You can thank the Chinese...
 
My advice is to find a good and trusted supplier and stick to them. Don't buy the cheapest you can find on eBay or at jumbles / swap meets etc, that’s just asking for trouble, and the potential time that can be lost chasing ghost demons caused by a faulty new plug WAY outweighs any initial cost saving !

There are no 100% guarantees, but buying from a trusted vender certainly puts the odds more in your favour.

For those in the UK, I use and recommended these guys:

Green Classic & Vintage Spares - Home

www.gsparkplug.com www.gsparkplug.com
 
Forget where I got these, but in the US I had to search quite a bit. Lots available from the UK but the cost with shipping was prohibitive.

Just ordered a batch of IW22s. Have used them before, kinda thought they were overkill but tired of issues.
 
Last edited:
Fast Eddie said:
My advice is to find a good and trusted supplier and stick to them. Don't buy the cheapest you can find on eBay or at jumbles / swap meets etc, that’s just asking for trouble, and the potential time that can be lost chasing ghost demons caused by a faulty new plug WAY outweighs any initial cost saving !

There are no 100% guarantees, but buying from a trusted vender certainly puts the odds more in your favour.

For those in the UK, I use and recommended these guys:

Green Classic & Vintage Spares - Home

www.gsparkplug.com www.gsparkplug.com
Click to expand...
I had heard rumours that The Green Sparkplug Company was oit, or about to be out, of business. Any recent orders?
 


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