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**Pinaki** · 02-13-2013, 03:51 AM

Sure Bro , postmortem comming up asap

. The bike's engine note is much changed (become more grunty) and it holds idle without any throttle at all at signals like when it was new . It's found some extra pep too

, eager to go 60+ now . Things that went missing since last monsoon . Loving it .... should buy Sibun a rose this 14th

.
What do you think , I should stick to the non-resistor local cap or fit the 5kΩ new OE one ? Plug is a ngk cr7hgp . I am now wondering how the bike was running 99.5% ok with 150+ kilo-ohms on that old cap . Also , do you have an idea how much resistance is in these spark plugs ?

**paul.1911** · 02-13-2013, 01:18 PM

Originally posted by Pinaki View Post

Sure Bro , postmortem comming up asap

. The bike's engine note is much changed (become more grunty) and it holds idle without any throttle at all at signals like when it was new . It's found some extra pep too

, eager to go 60+ now . Things that went missing since last monsoon . Loving it .... should buy Sibun a rose this 14th

.
What do you think , I should stick to the non-resistor local cap or fit the 5kΩ new OE one ? Plug is a ngk cr7hgp . I am now wondering how the bike was running 99.5% ok with 150+ kilo-ohms on that old cap . Also , do you have an idea how much resistance is in these spark plugs ?

What

?

I didn't knew that plug also contains resistor & non-resistor type!! I though its just for connecting the wire to the plug.
BTW, I also tested the resistance with analog and it was 4800Ω. Made of ANU.
So, Detective pinaki jee, stick with new OE cap. Also re-tune your carb because if resistor & non-resistor type spark plug can effect the tuning then resistor & non-resistor cap can also effect. So Dr. Watson recommends u to re-tune your carburettor.

**shoeb2015** · 02-13-2013, 03:54 PM

Originally posted by Pinaki View Post

Sure Bro , postmortem comming up asap

. The bike's engine note is much changed (become more grunty) and it holds idle without any throttle at all at signals like when it was new . It's found some extra pep too

, eager to go 60+ now . Things that went missing since last monsoon . Loving it .... should buy Sibun a rose this 14th

.
What do you think , I should stick to the non-resistor local cap or fit the 5kΩ new OE one ? Plug is a ngk cr7hgp . I am now wondering how the bike was running 99.5% ok with 150+ kilo-ohms on that old cap . Also , do you have an idea how much resistance is in these spark plugs ?

Or say old crap ?

My Champion P-RZ7HC shows a reading of 11.4K Ω.
I will be uploading a picture of my plug soon.
EDIT:
Micro U4A (not the UR4AC) shows a reading of just 11 Ω,quite normal for a non-resistor plug. I wonder if there be any improvement in ignition (or no improvement) at all after using a non resistor plug and cap.
Only Sibun and PSR ji can shed more light on this.

**Pinaki** · 02-13-2013, 06:24 PM

Originally posted by paul.1911 View Post

.... Also re-tune your carb because if resistor & non-resistor type spark plug can effect the tuning then resistor & non-resistor cap can also effect. So Dr. Watson recommends u to re-tune your carburettor.

Not a bad idea at all Watson Jee - even I am feeling that it's needed as the idle is gone quite high now .

Originally posted by shoeb2015 View Post

.. My Champion P-RZ7HC shows a reading of 11.4K Ω.
....
Micro U4A (not the UR4AC) shows a reading of just 11 Ω,quite normal for a non-resistor plug. I wonder if there be any improvement in ignition (or no improvement) at all after using a non resistor plug and cap .....

Page not found - NGK Spark Plugs

http://www.ngksparkplugs.com/techinfo/spark_plugs/faq/faqresistor.asp

I too don't think there would be any difference in the ignition or performance etc , as long as we have air-fuel mix and can compress it - it shall ignite upon spark . The spark is like a match stick - what effect can that have on the candle flame ? My thought was that eleminating a resistor (or two) in the ignition current's path shall eleminate a common point of failure , nahi ? At the cost of a bit of (radio) noise in the neighbourhood though

.

**ruthvikmagal** · 02-13-2013, 07:15 PM

Originally posted by shoeb2015 View Post

Here is the correct procedure.

Thank you Shoeb jee

**paul.1911** · 02-14-2013, 12:19 PM

Originally posted by shoeb2015 View Post

My Champion P-RZ7HC shows a reading of 11.4K Ω.
Micro U4A (not the UR4AC) shows a reading of just 11 Ω,quite normal for a non-resistor plug.

My PRZ7HC showed 21k Ω. and UR4AC showed 5k Ω, but how U4A can show a resistance? Its a non-resistor i tested with analog, and i can say whatever it had showed to u, was a resistance of a multimeter wire itself and not of a plug.

**Honda_CBF** · 02-15-2013, 08:15 AM

How are you guys measuring the resistance of spark plug? With non res. Type plugs and lines I guess one can burn more volume with higher compression.. So may be its a nice little starter mod

before one goes hard core. What say?

**paul.1911** · 02-15-2013, 04:53 PM

Originally posted by Honda_CBF View Post

How are you guys measuring the resistance of spark plug? With non res. Type plugs and lines I guess one can burn more volume with higher compression.. So may be its a nice little starter mod

before one goes hard core. What say?

I am using Mico U4A non-R (suggested by God of Bikes 'sibun') coz my bike burning little oil. Will fix that now. But for now after fitting U4A i re-adjusted and tuning get effected by half turn close and acceleration has also increased a lot, pulling better.
Non-R plug yields more spark on the combustion chamber. If u open the plug cap and check the spark, it will be blue. Whereas on R plugs it will be a bit pink/red.
Resistor plug get soot out soon when it comes in contact with oil. There are 4-5 types of different plugs available.
This short of things i learned recently. Need to go more deep into this.

**Pinaki** · 02-15-2013, 05:16 PM

I am getting around 4.5kΩ on the ngk CR7HGP , and 7.5kΩ on the champion PRZ7HC

. Meter double checked with 1% variance resistances of 2.2k,3.7k,4.7k & 5.3k - it's nearabout correct . Resistance measured between the center electrode on the firing end and the screw thread outside the plug on the other end . NGK's published value is 5kΩ .

**paul.1911** · 02-15-2013, 05:35 PM

In all our champion PRZ7HC is giving a lot different valves

can't say about NGK (never bought). One of my friend have newly installed PRZ7HC will check in that too.

Updated:
As said, i checked my friends PRZ7HC and it was 10k Ω

**psr** · 02-15-2013, 06:35 PM

From my personal experience I had found that the Champion spark plugs are not so good....I have had poor performance to engine misfiring with both two wheeler and Four wheelers engine running on Champion plugs...Stick to Original NGK. It is the recommended plug World Over for performance and reliability...I had changed quite a handful of Champion plugs due to failure,whereas I am yet to change one NGK due to problems...in fact a few of the plugs in my car and bike had run more than 20 K Kms without issues and I changed them due to their aging...
A Resistor is introduced into the High Voltage circuit of a spark plug to reduce the spark current,thereby reducing RFI and Interference..It is enough if there is a 4 K ~5 K Ohms resistor, in either the HT cable,Or the Plug Cap, or inside the Spark plug....The resistor needs to be present in one place only.... If you have resistor in more than one place in the High Voltage circuit, then the spark intensity will be reduced, and bike performance under load will become less than optimum....

**shoeb2015** · 02-15-2013, 08:13 PM

Thanks Sibun,Pinaki ji,PSR ji,Paul and everyone for the technical discussions and real life biking experience.
Feels great to know that PSR jee also has an eye on this thread.
This is probably the only thread where every diagnostic (simple or confusing) leads to a new technical discussion. Keep it up guys !
@Sibun
Now its your turn to reply. How are you ? Also,Waiting for your review of Cbz xtreme.

**psr** · 02-15-2013, 08:25 PM

Originally posted by shoeb2015 View Post

Thanks Sibun,Pinaki ji,PSR ji,Paul and everyone for the technical discussions and real life biking experience.
Feels great to know that PSR jee also has an eye on this thread.
This is probably the only thread where every diagnostic (simple or confusing) leads to a new technical discussion. Keep it up guys !
@Sibun
Now its your turn to reply. How are you ? Also,Waiting for your review of Cbz xtreme.

This thread has a lot of useful and pertinent discussions, and helps me in my learning....so I have to keep coming to this thread every now and then for Upgrade.

**paul.1911** · 02-15-2013, 11:26 PM

@ psr ji
would like to ask one thing. In our bike, spark plug cap have came with resistor in-built from factory. and there are 3 different brands of spark plugs which company recommends, and all they have resistor in-built. So there we've got two resistors in line. In that case what should we do? Should we remove any 1 resistor?

If have checked spark 'color' removing plug cap with a resistor plug and a spark appeared little pinkish. Which indicates a bit low volts.

Here is the video which has also been uploaded by me sometime ago.

So if a cap which is a resistor from stock, when installed the volts would have gone more low, i think.

Also, recently when i installed a non-resistor plug on my bike, the spark color appeared blue because there was no resistor, so a resistor cap is installed. Hence, then i got 1 resistor in-line. And when i re-tuned my bike, the bike acceleration dramatically improved!

So whats your suggestion in this regard? Should we use only one resistor? or two resistors in-line (like in stock)?

**Pinaki** · 02-15-2013, 11:34 PM

Thanks psr'jee for confirming what I found until now -
1) The presence of the resistances in the plug , plug-caps ( and I dunno if my HT ignition cable has some resistance too ? ) is solely for the purpose of radio noise supression and of no fuctional utility to the bike .
2) presence of 2 resistances of 5kΩ each in the OE setup - one inside the plug-cap and one inside the plug itself (total of 10kΩ), may be excessive for the said purpose .

Now why is HeroHonda and presumably other makers using this setup on all their bikes ? Can we safely do without one of the resistances ? Can the ignition system presumably designed for a total of 10kΩ inline resistance, function with less with no harm (to the CDI for example) in the long run ? Can any real benefit arise from such a mod ?

@paul - in my owner's manual ngk cr7hsa is the only recomended plug . None other is mentioned .

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