Could it be coils? - Triumph Forum: Triumph Rat Motorcycle Forums
Hinckley Classic Triples 885cc Classic Styled T3's: Legend, Thunderbird, Thunderbird Sport & Adventurer.

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post #1 of 47 (permalink) Old 01-25-2019, 03:08 PM Thread Starter
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Could it be coils?

All - i wonder if i could get some help.

Ive been working through the various issues with a 'new' bike ('99 Legend TT), over the last year. And having recently replaced the plugs, oil and now airbox in a 'big-ish' service, i'm raring to go. However, the bike is still exhibiting an annoying issue.

I have an intermittent 'misfire' or issue with the left hand cylinder. I know it's that one, because the left pipe (1 into 1) goes basically dead when the issue presents itself. It's usually a little way into the ride, at least 5 mins normally, and i'll be sitting at 3000revs cruising along, and the the left hand cylinder will just sputter. It's especially noticeable under acceleration, where the bike coughing between two and three cylinders, doesn't exactly lead to a smooth acceleration! I had thought it temperature related (it would happen when the bike was hot, on a hit day...) but today it happened with a cold bike on a cold day, so ruling that out.

From reading around, and bearing in mind i've got brand new plugs in the bike, my guess is its probably the coil.

Would you agree? Or could it be something else? Would the best course of action to diagnose a faulty coil be to swap a coil around and see if the issue follows to the other side?

Interested in peoples thoughts and potential guidance on replacement (or upgrade to stick coils?) - any thoughts on particular brand to go for much appreciated! Thanks as always in advance.
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post #2 of 47 (permalink) Old 01-25-2019, 03:57 PM
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easy way to test swap coil that you think is the problem with a known good firing cylinder it could be the igniter thats what it was on my bike I went to ingtec ignitor and then did the stick coil mode you can find all the info to do this on this site
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post #3 of 47 (permalink) Old 01-25-2019, 04:58 PM
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There is far more experience here than me with the Hinckley Triples, but that is the big symptom with bad coils and these bikes' original coils had issues anyway.
Suggest replacing all three with Nology coils. They made my Legend TT with similar symptoms run like a dream!
Fast Eddy's sells them. He's one of US, has fantastic customer service and good prices. https://www.fasteddysports.com/produ...product_id=946
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post #4 of 47 (permalink) Old 01-25-2019, 05:09 PM
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also check the resistance in your plug wires, a bad plug wire can work when they are cold but once it gets hot the resistance builds to where it won't pass current.
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post #5 of 47 (permalink) Old 01-25-2019, 06:32 PM
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Quote:
Originally Posted by Landlocked View Post
also check the resistance in your plug wires, a bad plug wire can work when they are cold but once it gets hot the resistance builds to where it won't pass current.
Was going to suggest the same, my 01 TB had a bad plug wire on the #2. The guy before me apparently broke the boot jamming down into the spark plug and it was shorting to the head for me...same symptoms as yours but my #2. Easy enough to check the wires out first and the ohms.

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post #6 of 47 (permalink) Old 01-26-2019, 02:13 PM Thread Starter
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Many thanks for your replies all

So i had LOTS of fun trying to sort through this today, culminating in a breakdown (due to another electrical issue!)

I have checked the HT leads, and they are all within spec (according to the values in Haynes). I did find number1 HT was quite corroded (the contact, see picture. Good one on the left) compared to the others, so i have given that a clean but will likely replace soon. I've swapped the coil around, and i THINK the issue followed the 'bad coil'... it's hard to tell, but more riding will tell.

The 'breakdown' was the bike just cutting out, and going basically down to one cylinder... to keep it going, i basically had to pin the throttle to even make 50mph... i was not happy! As soon as i was letting the revs drop off, the bike would almost stall, and then wouldn't restart.

So reading elsewhere on the forum, i've narrowed it to either the HT coils (new set ordered!) or the pickup coil. I've since had the cover off the engine, and have bang on spec resistance across the pickup coil (560ohms), but the spacing was a little tight, so i've reset that to .06mm (not that that would have caused the issue)

I ALSO found i hadn't tightened the clamps around the num1 carb rubber (between engine and carb) so they were loose and leaking... found that whilst checking the airbox drain, crank breather and tank breather pipe were all free. which they are.

So, plenty worked through with your help thanks... Will be very interesting to see how she performs and if the issue's got any better, before swapping out the HT coil. The only other thing, to add into the mix is that i have swapped the old instruments out for a smaller digital speedo (a motogadget) so there currently isn't any load on the HT coil 1, where the tacho would have been coming off of. Don't support that would make a difference, would it?
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post #7 of 47 (permalink) Old 01-26-2019, 06:57 PM
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I would not be suprized at all if you found the coil to be the culprit. I have played with these T-3 engines for a lot of years. I own two of them. I have had these same symtoms with both bikes. Both times it came down to replacing the coils. I just throw all three in the trash and get new ones. Problem solved. I just bought some inexpensive ones last time ($36 ea.) on ebay. Or you can go to stick coils, or Nology's. You pay your money and take your choice. ...J.D.
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post #8 of 47 (permalink) Old 01-27-2019, 01:14 PM Thread Starter
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Quote:
Originally Posted by Wire-Wheels View Post
Or you can go to stick coils, or Nology's. You pay your money and take your choice. ...J.D.
Yes, a proper upgrade is definitely in the plan. I have read a lot about stick coils, but for the life of me can’t find the near “definitive” thread that sets out the part/manufacturer of the stick coils that will work...do you know where I can find that guidance by any chance?
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post #9 of 47 (permalink) Old 01-27-2019, 03:25 PM
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https://www.triumphrat.net/hinckley-...ls-on-tbs.html

Keith in PA (USA)
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post #10 of 47 (permalink) Old 01-27-2019, 04:00 PM
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I actually had a bad plug wire, bad coil and a bad ignitor all at the same time. I replaced the ignitor with the Ignitec and bought some coils for $27.00 and been running good ever since.
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