Not another spark plug thread.

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Josh Cox

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Have spark plugs, am happy with them.

Leads and caps, purchased a set of silicone coated carbon suppressed leads, they are quite frankly giving me the shits with being hard to start etc etc.

Running Boyer.

The leads that were on the bike are copper stranded, no suppressors.

I am aware of the EM interferrence issues of no suppressors, so what is everybody using ?.

Suppressor / no suppressor ?, lawn mower leads ?, grandma's undies wrapped in aluminium foil ? ( Jordan swears by them :D ).
 
New carbon leads should work reasonably well for a while, but are not comparable to proper copper, and largely find favour as they are very cheap to produce. Unless the resistance of the carbon leads you have is very high, they wont be the cause of your starting problems.
 
If you are using the analog Boyer (Micro Mk1-Mk4) then suppression methods aren't needed -- assuming stock charging system. I use copper core wire (old fashioned Packard 440) and straight thru caps (Sparky brand from a marine or dirt bike shop) with N7YC non-resistor plugs.

If you have a non-stock charging system, some power boxes are affected by EMI from the plug leads and they do want you to use either suppression wires OR resistive plug caps OR resistor spark plugs. Good quality carbon core wire has worked fine for me also but don't use if you already have suppressor spark plug caps or resistor plugs because then you would have too much resistance and the resulting spark would be weaker than it could be. There are a lot of exotic plug wires along with snake oil claims out there too. Fun stuff.
 
I would suggest using the helical wire core plug wires , non- resistor caps and resistor spark plugs.

Here is a link to my favorite plug wires. http://www.taylorvertex.com/Products/index.cgi/spiroPro

The helical wire plug wires are durable like solid wire and yet offer radio suppression without the high impedance of carbon core wires. 250 to 500 ohms per foot verses 5000 ohm per foot or more. Carbon core wires don't like the vibration they see on a Norton.

The resistor at the plug -whether it is in the cap or in the plug - will fail occasionally. If you use a resistor plug instead of a resistor cap then you get a new resistor every time you replace the plug.

Using a resistor plug and a resistor cap at the same time is not a good idea. Using resistor plug wire and a resistor cap at the same time is not a good idea. Having too much total resistance in the secondary can make hard starting and shorten the life of the coil. Jim
 
Carbon leads, probably about 15 years old now, NGK plugs.
Always starts 1st time (well, 2nd time sometimes), runs lovely.
 
Flo said:
Carbon leads, probably about 15 years old now, NGK plugs.
Always starts 1st time (well, 2nd time sometimes), runs lovely.
Click to expand...


Man you just jinxed yourself now. Better put a spare pair of wires in your kit. :D Jim
 
Running a Boyer and a Sparx three-phase alternator, Sparx advised that I should use resistor plugs OR resistor wires/caps - for 5K ohms total resistance.

NOT resistor plugs AND resistor wires/caps.
 
Is using NGK 5K resisitors cap and BPR7EIX ( resistor iridium ) likely to cause problems ?, two resistors in series ?.
 
Josh Cox said:
Is using NGK 5K resisitors cap and BPR7EIX ( resistor iridium ) likely to cause problems ?, two resisitors ?.
Click to expand...

Probably. Try either one or the other. Presumably you are not using the "carbon suppressed" wires you mentioned before as well as resistor caps and plugs?
 
The reason for my question is, the NGK plug caps are 5K, the Champion caps are 10K.

The combination of NGK cap and a "R" plugs, BPR7ES or BPR7EIX, would it cause an issue with spark.

I've noticed a couple of british bikes around town with NGK 5K caps and "R" plugs, did not have a chance to ask intelligent questions, either due to not being able to talk to the owner, or the owner chose to hang out with Harley riders, and we all know what that means.
 
Steel core wires (yup, lawn mower), standard Champion plugs and silicone boots. Sparx charging system has no issues, but it's located far from the ignition.
 
Josh Cox said:
the Champion caps are 10K.
Click to expand...

Not all of them, Champion PRO0U = 0 Ohm, PRO5U = 5 kOhm:
http://www.sparkplugs.co.uk/pages/prici ... ps-ccp.asp



Josh Cox said:
The combination of NGK cap and a "R" plugs, BPR7ES or BPR7EIX, would it cause an issue with spark.
Click to expand...

It's difficult to say, maybe yes, maybe no, any brand new R plugs will work with resistor caps, but there's no guarantee that it won't be the cause of poor starting and plug fouling problems-eventually, although there's probably less chance of that with the Iridium (IX) plugs.

But why set yourself up for potential problems which could occur as a result of using both R plugs and caps? It's simply unnecessary in my opinion-as one or the other should be enough, and if the bike does not have a digital ignition system (or Sparx reg/rec box) fitted then there's no reason to use any HT suppression at all (except to suppress local TV and radio interference, obviously). If I remember correctly, I think Boyer Bransden recommend that no more than 5 kOhms of resistance should be used with their systems.
 
But why set yourself up for potential problems which could occur as a result of using both R plugs and caps?
Click to expand...

LAB, no arguement from me, I am trying to understand the guys I've seen here in Cairns that are fitting both, what could they possibly hope to gain, it is beyond me.
 
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