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Peter Quick
Peter Quick
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So completely dismantling my new (to me) 1982(ish) T-140 ES, IM searching for the ignition electronic box that is shown for the ‘82 Model year T-140. We’ve already established that the bike is indeed a 1982 by the serial number stamped on the engine (2CM030978). I’m simply not finding any kind of “box”, but instead noticed 3 transistors mounted to the air box. Totally baffled now, I take the small round plate off and behold!!!! CONTACT POINTS! NOWHERE in the “British Only” Tech Library for ANY 1982 T-140, does it show a contact point ignition OR transistors. So either the serial number methodology is incorrect, and it has a much older engine in it than a1982, OR, The parts catalog on the British Only site is horribly incorrect....Also, the stamped serial number doesn’t even show up in the serial number range for 1982!......I still believe this is a completely stock bike, including the engine! WEIRD!!!


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1982 serial numbers are 30001 - 31693 from the serial number link at the top of the page, so you are well inside, even if the prefix is different.


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the 3 transistors may be 3 zeners ?

wired to the ac side , before a 3 phase rectifier .
one zener per phase , of a 3 phase stator .

used this way the zeners dont need matching
and each zener only needs to handle the overvoltage of its own phase .

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Originally Posted by DPO
We’ve already established that the bike is indeed a 1982 by the serial number stamped on the engine (2CM030978). I’m simply not finding any kind of “box”, but instead noticed 3 transistors mounted to the air box.

The "3 transistors" is probably the 3-phase 2 CDP triple Zener diode pack (81-on T140 Manual, section H11). .
[Linked Image from i.postimg.cc]
[Linked Image from i.postimg.cc]

Originally Posted by DPO
Totally baffled now, I take the small round plate off and behold!!!! CONTACT POINTS! NOWHERE in the “British Only” Tech Library for ANY 1982 T-140, does it show a contact point ignition OR transistors. So either the serial number methodology is incorrect, and it has a much older engine in it than a1982, OR, The parts catalog on the British Only site is horribly incorrect....

...OR a PO fitted points ignition.

Edit: As it has points ignition, check if the ignition coils are the original 6V Lucas 17M6 in which case there should be a ballast resistor connected somewhere or, if 12V coils (17M12) have been fitted?

Last edited by L.A.B.; 09/15/21 7:47 am. Reason: Wiring Digram & edit
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know id seen 3 zeners used somewhere , at least on paper
[Linked Image from triumphrat.net]

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Originally Posted by DPO
.....I still believe this is a completely stock bike

Why?


Amateur Loctite enthusiast.
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Originally Posted by triton thrasher
Originally Posted by DPO
.....I still believe this is a completely stock bike

Why?

Because every bolt, screw, component, or item I take off to inspect and clean appears to have been in place since the bike was new, and NOTHING has been tampered with. All hardware appears to be completely stock....and I’ve disassembled ALOT of vintage British bikes!


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i remember stopping for a brand new Triumph 750 which had broken down with no sparks , somewhere in Fife circa 1982, it had Lucas Rita EI, which presumably had failed. Quite possibly the EI was changed to points as a fix.


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Just gonna purchase a Tri-Spark for it. Can’t get MAP to tell me whether Tri-Spark is compatible with the bike. I’m thinking the Pazon only covers up to 1979 T-140....


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Originally Posted by DPO
Just gonna purchase a Tri-Spark for it. Can’t get MAP to tell me whether Tri-Spark is compatible with the bike. I’m thinking the Pazon only covers up to 1979 T-140....

That's because the Pazon (Tri-Spark etc.) is intended to replace original points ignition but that doesn't mean it can't be used to replace original EI (Lucas Rita).

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Trispark has fans and haters.
I don't think all that electronics is safe in the Triumph engine

The standard would have been RITA electronic ignition, 6v coils.

I'd bung in a Pazon and if you have spare money, 6v PVL coils.

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The far more economical pazon , Boyer and Vape- wassail will all work
with any T140 .
The caveat with these more economical ignitions
is good-to-better wiring and switchgear that can keep
Circuit voltage above 10 volts when the particular T140
Is fitted with and using a starter motor , which invariably pulls a high load .

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Recommend Pazon Surefire and good 6volt coils.
Only to be fitted when wearing flip flops of course!

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Will a Pazon be compatible with my 1982 ES? The description says UP TO 1979 model year T-140.


If you love it, let it go. If it comes back, you've highsided!"
2016 Triumph Bonneville America LT
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1982 Triumph T-140 “Electro”
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Originally Posted by DPO
Will a Pazon be compatible with my 1982 ES? The description says UP TO 1979 model year T-140.

the answer is still yes

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[Linked Image]. Ahhh my favorite part! Ya gotta get the acid flushed out before you learn what “flash rusting is!

Last edited by DPO; 09/17/21 1:36 am.

If you love it, let it go. If it comes back, you've highsided!"
2016 Triumph Bonneville America LT
1968 BSA Firebird “Scrambler”
1982 Triumph T-140 “Electro”

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