Plug Cap, resister type? - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 28 (permalink) Old 10-10-2015, 06:32 PM Thread Starter
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Plug Cap, resister type?

Hi All.

Can you use the resister type, spark plug cap for all applications, or is it only suitable with electronic ignition?

My bike has points, but if I fit the resister type I'm thinking I'll be covered if I decide to upgrade.


Thanks.
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post #2 of 28 (permalink) Old 10-10-2015, 07:30 PM
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Hi,

Quote:
Originally Posted by Rod Rocket View Post
Can you use the resister type, spark plug cap for all applications, or is it only suitable with electronic ignition?
Other way 'round; HT resistor is only required by some electronics (ignition or reg./rec.).

If it isn't specifically required, it isn't required.

Only if it is required, it's usually 5 KOhms and is either plug, cap or wire.

It isn't required for points and depending on the e.i., might not be required for that.

Hth.

Regards,

Stuart
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post #3 of 28 (permalink) Old 10-11-2015, 12:38 AM Thread Starter
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Quote:
Originally Posted by StuartMac View Post
Hi,


Other way 'round; HT resistor is only required by some electronics (ignition or reg./rec.).

If it isn't specifically required, it isn't required.

Only if it is required, it's usually 5 KOhms and is either plug, cap or wire.

It isn't required for points and depending on the e.i., might not be required for that.

Hth.

Regards,
So is the "SPARK PLUG CAP NGK LB05F" not suitable for standard applications?

I'm trying to source an NGK equivalent for the original champion caps/leads.
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post #4 of 28 (permalink) Old 10-11-2015, 05:05 AM
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The LB05F is suitable for points ignition and for any electronic system that I've heard about. You have to remove the little nut from the plug terminal.

http://www.ngksparkplugs.com/docs/resistor_covers.pdf

Use copper cored plug leads and plugs without an "R" in the number.
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Last edited by Triton Thrasher; 10-11-2015 at 05:13 AM.
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post #5 of 28 (permalink) Old 10-11-2015, 05:51 AM
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Do they have to be 5K or will 10K work as well?

http://www.ebay.co.uk/itm/WCX600-180...item35ec365555
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post #6 of 28 (permalink) Old 10-11-2015, 05:59 AM
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With points, no resistor or 5,000 ohm resistor will work with points and the common analogue electronic systems. Digital systems seem to need a resistor.

10,000 ohm resistor will probably usually work.
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post #7 of 28 (permalink) Old 10-11-2015, 06:32 AM
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Slightly off topic, but an interesting read:

http://www.auroraelectronics.com/Und...ug%20Wires.htm
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post #8 of 28 (permalink) Old 10-11-2015, 07:50 AM
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Hi,

Quote:
Originally Posted by Rod Rocket View Post
My bike has points,
Quote:
Originally Posted by StuartMac View Post
It isn't required for points
Quote:
Originally Posted by Rod Rocket View Post
So is the "SPARK PLUG CAP NGK LB05F" not suitable for standard applications?
Quote:
Originally Posted by Triton Thrasher View Post
The LB05F is suitable for points ignition and for any electronic system that I've heard about.
Any 5 KOhm resistor plug, cap or wire isn't unsuitable for points or e.i. that doesn't need it. It just doesn't provide you or your motorcycle with any benefit either, but is something else to go wrong.

Quote:
Originally Posted by Rod Rocket View Post
I'm trying to source an NGK equivalent for the original champion caps/leads.
Depends what "the original champion caps" were.

On my Triumphs, they were simply a cover over the lead's attachment to the plug, so no resistor plug cap can be an "equivalent".

If your local laws required the original caps to be resistive, it can only have been to prevent interference with nearby analogue tv and radios. If you have violent neighbours still using these nearby then maybe your bike does need resistive plugs, caps or wires ...

Quote:
Originally Posted by BonneFire View Post
Do they have to be 5K or will 10K work as well?
In an electrical circuit, while some resistance is necessary to prevent it being a 'short', 'more is not good'. Electrons will always take the path of least resistance. The spark plug air gap is already a huge resistance. If you keep adding to it, eventually the HT will find another path. Then, not only won't there be a spark at the plug, if the path the HT has found is through some electronics, that faint smell of burning is always expensive.

That's also why e.i. makers always advise against disconnecting the HT when the ignition's working.

Hth.

Regards,
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post #9 of 28 (permalink) Old 10-12-2015, 07:17 PM
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Seems lie I read somewhere that there was an advantage to running a reistor cap or plug with points, that it increased the spark duration or some such ?
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post #10 of 28 (permalink) Old 10-13-2015, 04:08 AM Thread Starter
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Quote:
Originally Posted by duc96cr View Post
Seems lie I read somewhere that there was an advantage to running a reistor cap or plug with points, that it increased the spark duration or some such ?
Interestingly this is what NGK quote:

LB05F: The resistor cover comes equipped with a 5k ohm ceramic resistor for excellent defense against RFI (radio frequency interference) which can disrupt electronic ignition performance and lead to misfire.
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