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Burning out spark plugs on a 1968 T100S #215137 09/23/08 11:41 pm
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lsettle Offline OP
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So far I have driven the T100S for about 92 kms. I have gone though 2 spark plugs (NGK B8ES). I have noted that when I hook up a in-line spak plug tester, the side that is burning the plugs out is dimmer that the other side (right). I have installed new coils, new Walridge, they were on sale~ and I still am using the original condensers. I am running a points ignition with a 12V battery.

Any ideas? I am think about buying a new coil and new condensers


Thanks

Lawrence
Canada

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Re: Burning out spark plugs on a 1968 T100S [Re: lsettle] #215140 09/23/08 11:57 pm
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JubeePrince Offline
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Lawrence,

Can you explain what 'burning out' means?

Covered in soot?

Electrode melted?

Not sparking?

Steve


'77 T140J
"Vintage Bike". What's in your garage?

"The paying customer is always right."

Fitting round pegs into square holes since 1961...
Re: Burning out spark plugs on a 1968 T100S [Re: JubeePrince] #215147 09/24/08 12:17 am
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lsettle Offline OP
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JubeePrince,

The spark plug is not sparking.

Re: Burning out spark plugs on a 1968 T100S [Re: lsettle] #215151 09/24/08 12:26 am
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JubeePrince Offline
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Originally Posted by lsettle
I have installed new coils, new Walridge, they were on sale~ and I still am using the original condensers. I am running a points ignition with a 12V battery.


OK Lawrence.....I'd pull the points cover while it's running. Sparking/arcing points are a symtom of bad condensers.....


HTH,

Steve


'77 T140J
"Vintage Bike". What's in your garage?

"The paying customer is always right."

Fitting round pegs into square holes since 1961...
Re: Burning out spark plugs on a 1968 T100S [Re: JubeePrince] #215187 09/24/08 10:19 am
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lsettle Offline OP
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Steve,

I will check the points out in the afternoon,


what does HFH stand for?


Lawrence

Re: Burning out spark plugs on a 1968 T100S [Re: lsettle] #215212 09/24/08 1:00 pm
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JubeePrince Offline
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HTH = Hope That Helps!

Re: Burning out spark plugs on a 1968 T100S [Re: JubeePrince] #215229 09/24/08 4:25 pm
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RF Whatley Offline
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Lawrence -
I think the answer is simpler than that. B8ES is far too cold a plug for a Triumph twin. You're plugs are simply fouling out with all the oil your new engine is burning. I know some of the newer charts call for a B8ES, but those charts are in error.

If you'll install the correct heat range plugs, B7ES, then I think your problems will be greatly reduced, if not disappear completely. The plug's center electrode needs to be clean, and after many miles should take on a color of tan beach sand up to the brown color of hot cocoa.

Hope this helps!


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA
Re: Burning out spark plugs on a 1968 T100S [Re: RF Whatley] #215231 09/24/08 4:31 pm
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JBMorris Offline
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<<B8ES is far too cold a plug for a Triumph twin>>
RF,
Does that also apply to a '78?


1978 Bonneville T140V PX
Re: Burning out spark plugs on a 1968 T100S [Re: JBMorris] #215236 09/24/08 4:44 pm
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RF Whatley Offline
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YES. Except that around 1978 or 79 they started using an even hotter plug than B7ES.


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA
Re: Burning out spark plugs on a 1968 T100S [Re: RF Whatley] #215241 09/24/08 5:02 pm
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JubeePrince Offline
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Originally Posted by RF Whatley
Lawrence -
I think the answer is simpler than that. B8ES is far too cold a plug for a Triumph twin. You're plugs are simply fouling out with all the oil your new engine is burning. I know some of the newer charts call for a B8ES, but those charts are in error.

If you'll install the correct heat range plugs, B7ES, then I think your problems will be greatly reduced, if not disappear completely.


RF,

Good thoughts on the plugs, altho I did ask him if they were sooty/fouled....perhaps there's more he's not telling us.....


AIUI, the N5C's (~B6ES) were used with the advent of the T140E parallel port head.....

Cheers,

Steve





Last edited by JubeePrince; 09/24/08 5:04 pm. Reason: afterthought

'77 T140J
"Vintage Bike". What's in your garage?

"The paying customer is always right."

Fitting round pegs into square holes since 1961...
Re: Burning out spark plugs on a 1968 T100S [Re: JubeePrince] #215300 09/25/08 12:32 am
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lsettle Offline OP
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Group,

Steve got me to check the points and everything looked fine. So I switched the coils around, to see if the fault follows a coil. and while I was messing around, I put in a new set of plugs for an XS650 of mine. The new spark plugs are NGK BP7ES.

I will let you guys know if it was the coil. and I ordered new condensers. they were pretty cheap and they were on the list to replace!


Thanks

Lawrence

Re: Burning out spark plugs on a 1968 T100S [Re: lsettle] #215324 09/25/08 7:30 am
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dave jones Offline
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Those aren't the right plugs either. You want B7ES.


Last edited by dave jones; 09/25/08 7:37 am. Reason: boring
Re: Burning out spark plugs on a 1968 T100S [Re: dave jones] #215342 09/25/08 10:13 am
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gs750 Offline
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Isn't the BP7ES plug the one with the extended tip? If so you may end up causing damage to a piston or the head.

Get the B7ES and have done with it.


1971 Triumph T100C
1974 Honda XL350
1982 Suzuki GS750T
2000 Honda VFR800FI
Re: Burning out spark plugs on a 1968 T100S [Re: gs750] #215404 09/25/08 5:11 pm
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JubeePrince Offline
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Originally Posted by gs750
Isn't the BP7ES plug the one with the extended tip?


Yes it is.

What Dave and gs said: B7ES or Champion N4C.

Steve


'77 T140J
"Vintage Bike". What's in your garage?

"The paying customer is always right."

Fitting round pegs into square holes since 1961...
Re: Burning out spark plugs on a 1968 T100S [Re: JubeePrince] #215417 09/25/08 6:52 pm
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RF Whatley Offline
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In my humble estimation, the "protruded tip" is a better plug, if your piston doesn't end up closing the spark gap for you automatically. The heat range of "7" is still the same as a B7ES.

I run a BP6ES on my T-bird, but then my piston tops on the 7.5:1 CR are fairly low. Like I said on the other thread with a similar subject, it's all about your compression.



Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA
Re: Burning out spark plugs on a 1968 T100S [Re: JubeePrince] #215425 09/25/08 7:48 pm
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east end rider Offline
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I am using B8ES on my '67 T100R and they are just right, stock main, needle in #2 position and I have Boyer not points

Re: Burning out spark plugs on a 1968 T100S [Re: east end rider] #215427 09/25/08 8:34 pm
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lsettle Offline OP
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I went to the store today and I picked up B7ES's installed them and plan on going for a drive tonight.


Thanks

Lawrence

Re: Burning out spark plugs on a 1968 T100S [Re: lsettle] #215841 09/28/08 5:05 pm
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lsettle Offline OP
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Update,

I installed the B7ES'S, I noticed that the NGK spark plug caps were 5K, so I installed 1k caps. I then hooked up my colourTune, saw that I was running very rich, change the clip postion on the main needle to 1st from the 3rd (bottom) and adjusted my air screw, at idle the flame is still slightly yellow, but Blueish.

The plugs are not getting fouled with black [email protected]#t anymore!


Lawrence

Re: Burning out spark plugs on a 1968 T100S [Re: lsettle] #215930 09/29/08 1:50 am
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RF Whatley Offline
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Lawrence -

A standard system is not supposed to have resistor wires OR resistor plug caps. However some forms of the Boyer ignition and some alternators require them. Do you know that these are required?



Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

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