NGK's Trident - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 38 (permalink) Old 10-12-2019, 12:31 PM Thread Starter
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NGK's Trident

Going to try some NGK iridium plugs in my 74 t150. #7's or #8's?

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post #2 of 38 (permalink) Old 10-12-2019, 12:57 PM
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Seems odd that it’s a T140 on the other forum. http://www.triplesonline.com/forum/getmsg.asp?208246

Hope you’ve got more sense than to fit a softer plug than standard.

Last edited by Tritn Thrashr; 10-12-2019 at 01:09 PM.
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post #3 of 38 (permalink) Old 10-12-2019, 02:01 PM
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What's the normal heat range for a copper core? Stuart says an Iridium plug has a wider heat range...Are you trying to mask an igntion problem? Have unusual riding conditions ? They are $25 for three? Perhaps try a NGK competition plug with the cut back ground electrode, about $3 each...They are non resistor....In my race bike I believe they made a very slight increase in power over the NGK fine wire plugs I was using...Supposedly the wider ground electrode have a stronger spark kernal..But the ony way to know is try them all ....

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post #4 of 38 (permalink) Old 10-12-2019, 03:58 PM
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Originally Posted by htown16 View Post
Going to try some NGK iridium plugs in my 74 t150. #7's or #8's?
Houston - so good to hear from you again.

Opinions are a dime a dozen, but a top Triumph mechanic who's been a factory-trained expert since '69 says NGK's threads often strip the aluminum threads on Triumph heads.......and I had that very experience using them on my '73 Trident.....
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post #5 of 38 (permalink) Old 10-12-2019, 06:25 PM
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T150 ngk br8eix

I've been running NGK BR8EIX plugs on my 73 T150 for years. I pay $3.50 for them at Advance Auto. Bob
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post #6 of 38 (permalink) Old 10-13-2019, 03:31 AM
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Hi GN,

Quote:
Originally Posted by gatornapper View Post
Opinions are a dime a dozen,
Otoh, I've used NGK's exclusively since about 1979 and never stripped a thread in any head, Triumph or other. Mind, I also always fit plugs with a little Copaslip on the thread, after cleaning any thread on a plug being reused.

Hth.

Regards,

Stuart
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post #7 of 38 (permalink) Old 10-13-2019, 07:17 AM
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I've been running NGK BR8EIX plugs on my 73 T150 for years. I pay $3.50 for them at Advance Auto. Bob
$8.19 each at Advance Auto here in NY, between $7-9 from all the other discount stores online...You're getting a deal...

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post #8 of 38 (permalink) Old 10-13-2019, 03:05 PM
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Hi GN,

Quote:
Originally Posted by gatornapper View Post
Opinions are a dime a dozen,
Otoh, I've used NGK's exclusively since about 1979 and never stripped a thread in any head, Triumph or other. Mind, I also always fit plugs with a little Copaslip on the thread, after cleaning any thread on a plug being reused.

Hth.

Regards,
I've never stripped one either, dozens of vehicles and lots of plug changes of various makes over many years but I am interested; how does the make of plug affect the chance of thread damage? Surely over-torquing is the main risk, OR do some plugs promote cross threading?
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post #9 of 38 (permalink) Old 10-13-2019, 07:51 PM
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The main risk is carbon build up on exposed threads...most don't have exposed thread (thankfully) but those that do - and it only needs to be half a turn - will work the thread every time you remove the plug. Carbon build up is hard and abrasive.

I have a head on my Trident [that I bought at a swap meet many moons ago] that had the centre hole damaged, and the other two not looking great. I used time serts on them and they are fine.

On my T140W the last turn or two are exposed, when I got the bike one hole had already been helicoiled [and it had very low mileage on it]. This only made exposed thread section longer....but the carbon didn't wear the helicoil out, all it did was pick it up and as the plug came out so did the helicoil. This happened to be in middle of nowhere at the end of the earth. I had to get towed for miles by my mate.

Needless to say I have now repaired that head with time serts as well.

I don't think the make of plug is an issue, but the exposed thread can be, you need to use plug washers to lift the plug and make sure that your thread is covered.

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post #10 of 38 (permalink) Old 10-14-2019, 09:59 AM
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Quote:
Originally Posted by gatornapper View Post
Houston - so good to hear from you again.

Opinions are a dime a dozen, but a top Triumph mechanic who's been a factory-trained expert since '69 says NGK's threads often strip the aluminum threads on Triumph heads.......and I had that very experience using them on my '73 Trident.....

Gator your friend is wise. Anyone out there can use what they want but in the late 70's Triumph had a Service Bulletin issued that stated Champion was the Recommended plug. The reasons were flaking plating and the heat ranges were not a direct crossover on the other brands.


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