Resistor plugs and caps.

That tells me it's likely an RF rejection problem (in Podtronics' estimation) or an RF emission problem (in Trispark's estimation.) The solution is probably a choke comprising a few turns around a ferrite core.
 
hhh said:
That tells me it's likely an RF rejection problem (in Podtronics' estimation) or an RF emission problem (in Trispark's estimation.) The solution is probably a choke comprising a few turns around a ferrite core.
Click to expand...
That's what the Tri-Spark filter I mentioned before was. The PODtronics at the time produced noise that the choke was able to suppress. The later PODtronics produced noise the choke could not suppress.

Much smaller uf capacitors in the right range might have worked but the noise suppression of 6500uf (or 10000uf) is nowhere near the range of the noise produced. Keep in mind that the noise produced varies with RPM and therefore a single R/C, C, or I suppressor cannot suppress them all but fortunately not all are a problem.

Unfortunately, when I was studying all this, I was using an old Tektronics 465 scope so seeing what was going on was easy enough, but no way to record. If your PODtronics is old enough it will work fine, and Tri-Spark even sold those. Later versions of PODtronics is where the problem started.
 
marshg246 said:
That's what the Tri-Spark filter I mentioned before was. The PODtronics at the time produced noise that the choke was able to suppress. The later PODtronics produced noise the choke could not suppress.

Much smaller uf capacitors in the right range might have worked but the noise suppression of 6500uf (or 10000uf) is nowhere near the range of the noise produced. Keep in mind that the noise produced varies with RPM and therefore a single R/C, C, or I suppressor cannot suppress them all but fortunately not all are a problem.

Unfortunately, when I was studying all this, I was using an old Tektronics 465 scope so seeing what was going on was easy enough, but no way to record. If your PODtronics is old enough it will work fine, and Tri-Spark even sold those. Later versions of PODtronics is where the problem started.
Click to expand...
Sure glad some people understand all that.
Carry on....
 
IIRC, NGK have stopped production on quite a few non-resistor plugs.

If you look at their site for BP7ES - they are not available


Resistor plugs and caps.


But, BPR7ES are


So, if you are getting an R in your system, I would go for R plugs, and not R caps these days.
 
Last edited:
5k ohms seems to be the standard.
Why does Champion make this in 10k?
www.classicbritishspares.com

Spark Plug Caps (1) - Choose Cap Type / Manufacture

Keep your vintage British motorcycle looking original and authentic by checking out some of our spark plug caps we have to offer. We offer a few different variations and styles that work with 7MM spark plug wire. Some caps have resistors while others don't... Also great for universal purposes on...
www.classicbritishspares.com www.classicbritishspares.com
 
MichaelB said:
5k ohms seems to be the standard.
Why does Champion make this in 10k?
www.classicbritishspares.com

Spark Plug Caps (1) - Choose Cap Type / Manufacture

Keep your vintage British motorcycle looking original and authentic by checking out some of our spark plug caps we have to offer. We offer a few different variations and styles that work with 7MM spark plug wire. Some caps have resistors while others don't... Also great for universal purposes on...
www.classicbritishspares.com www.classicbritishspares.com
Click to expand...
I have a pair of those though they are labelled Lucas not Champion. Still 10k Ohms. Got them off a site catering to classic Jaguars. Seen them on Green Sparkplug website also. They ran fine on my Commando with non resistor plugs.
 
gortnipper said:
IIRC, NGK have stopped production on quite a few non-resistor plugs.

If you look at their site for BP7ES - they are not available


View attachment 104982

But, BPR7ES are


So, if you are getting an R in your system, I would go for R plugs, and not R caps these days.
Click to expand...
I noticed this recently and wondered if it was just a local parts store problem. The parts guy said Champion still has non resistor plugs.
 
NGK still supply the non resistor plug range B7ES etc in the UK but all the NGK plug covers are NLA
how long the plugs will remain in the range is a crap shoot apparently they never gave any customers advanced notification the caps were about to be de listed and NLA
It may be worth buying a box or two and stashing them away for future use
 
Odd that NGK are terminating caps, seems they took over thaat market nearly completely, every bike and car still using these types of ign setups seems to run NGK. I get it that the market is no longer growing, as new vehicles use coil type caps etc. But there should be millions still using older types. Guess they are just too good, don't need replacement often/ever.
 
MichaelB said:
5k ohms seems to be the standard.
Why does Champion make this in 10k?
www.classicbritishspares.com

Spark Plug Caps (1) - Choose Cap Type / Manufacture

Keep your vintage British motorcycle looking original and authentic by checking out some of our spark plug caps we have to offer. We offer a few different variations and styles that work with 7MM spark plug wire. Some caps have resistors while others don't... Also great for universal purposes on...
www.classicbritishspares.com www.classicbritishspares.com
Click to expand...
The rest of the story....

Officially, the hard Champion caps are not longer available. Wassell commissioned Federal-Mogul/Champion to do a large run and they are made in England.

They had 10k ohm made because they are acceptable for our bikes (more if you really want to do the math) and they are OEM for Jaguar / BMC cars using traditional points / condensers.

The Champion Non resistor PROU black rubber cap and the PROU-5U red rubber caps are again available in a Belgium central warehouse. The thought is that this is due to NKG stopping cap production.

"Wassell were the largest single customer for plug covers for NGK UK and the decision made by NGK to stop producing came without warning, we would have happily purchased 50k of each common part number if we had advanced notification."

Wassell is developing caps to replace the NGK caps.

Those selling the 10k ohm caps are getting them from Wassell. Wassell has a good stock of non-resistor NKG plugs but when they are gone it's over.
 
cliffa said:
How do the advance curve and power consumption compare to the original David?
Click to expand...
As stated in another post
I bought a Rex's speed shop Rita replacement
They told me the power consumption was less than the original Rita but couldn't tell me by how much
I tried it on my commando and checking the charge at idle with a meter it was identical to my original unit
So I lost interest and it's still on the shelf
One day I'll get around to making a box for it and fit it on for a proper test
 

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