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bikenut
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PostPosted: 10:58 - 07 Dec 2018    Post subject: neons Reply with quote

2 neon plug caps plumed in ( for ign testing/comparison ) would be the ideal, as the neon "flash" can be compared side for side, cylinder for cylinder, individual ign system to individual system, one for each cylinder., in cranking and running conditions, even on a road test.

The only common factor for each ign system ( apart from earths ) is the Y junction of battery voltage just before the coils., and the bike wiring thru the kill and ign switch before the coils.

So, do both coils get battery voltage when the ign is switched on. Check this with both sets of points disconnected from the coils.

back in abit.....
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Evil Hans
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PostPosted: 12:46 - 07 Dec 2018    Post subject: Reply with quote

What?
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weasley
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PostPosted: 12:53 - 07 Dec 2018    Post subject: Reply with quote

I'ma guess this was meant to be a reply to a "bike won't start" thread somewhere.
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bikenut
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PostPosted: 15:37 - 07 Dec 2018    Post subject: neons Reply with quote

These are red plastic spark plug caps that flash when ht goes thru them. They are relatively in expensive and a good indicator of ht being present, its strength and if the ign system is "mis firing" at any point.they are useful and can prevent "hair being pulled out" or dizzyness after you have been going round in circles wondering if the bike etc has a possible fuel fault, or ign fault.

I know I am not the only person that knows about them or uses them. I have found them very useful for the past 20 years or so.

The only problem with them is the nipple has to be screwed onto the plug, so the plug end of the cap will fit the plug, and, make an adapter so the fixed nipple on the ht lead end of the neon plug cap can be made to fit the non nipple type fitting of the plug cap on the bike etc.. They are an in line neon plug cap which shows ht.
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Evil Hans
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PostPosted: 17:29 - 07 Dec 2018    Post subject: Re: neons Reply with quote

bikenut wrote:
These are red plastic spark plug caps that flash when ht goes thru them. They are relatively in expensive and a good indicator of ht being present, its strength and if the ign system is "mis firing" at any point.they are useful and can prevent "hair being pulled out" or dizzyness after you have been going round in circles wondering if the bike etc has a possible fuel fault, or ign fault.

I know I am not the only person that knows about them or uses them. I have found them very useful for the past 20 years or so.

The only problem with them is the nipple has to be screwed onto the plug, so the plug end of the cap will fit the plug, and, make an adapter so the fixed nipple on the ht lead end of the neon plug cap can be made to fit the non nipple type fitting of the plug cap on the bike etc.. They are an in line neon plug cap which shows ht.


We know what they are, we just don't know why you started a new thread just to randomly talk about them Very Happy
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WD Forte
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PostPosted: 18:39 - 07 Dec 2018    Post subject: Reply with quote

I'd just put me scope on it.
Fannying about with neons tells you little other than it's getting a voltage higher than the turn on voltage of the neons
That's about 90V IIRC but its a tiny voltage in comparison to the voltage of a healthy spark.

Scope it
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bikenut
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PostPosted: 11:14 - 08 Dec 2018    Post subject: neons Reply with quote

yeh but how much is a scope?

These neons are cheap and give a good indication, well worth the money.
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Ste
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PostPosted: 11:29 - 08 Dec 2018    Post subject: Reply with quote

Sick
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