T509 violent misfire high revs - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 10 (permalink) Old 05-13-2019, 04:02 PM Thread Starter
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T509 violent misfire high revs

Hi all,

I've got a nasty misfire past half throttle at around 6-9k rpm in any gear. It's like riding a bucking bronco!!! Started after yesterday with the mrs on the back and has carried on all day today so it's not bad fuel as I've drained it and filled with super...

I've stripped it down tonight, tank off and air box off but cant find anything untoward? Pipes all fine, connectors tight...

Anyone have any ideas what it might be?

Cheers, Hubba
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post #2 of 10 (permalink) Old 05-13-2019, 05:07 PM
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How do your plugs look? I had some pretty bad misfiring on my '06 SV1000S despite new plugs, stripping the tank of some rust, and replacing a corroded fuel pump. Damn near threw me off the bike a couple of times too. It didn't clear up until I inspected my spark plug wires. That was the issue. When the bike got hot, the rubber insulator sheath expanded just enough to cause the front cylinder to misfire at high RPMs. The rubber insulation even got blasted by sparks as you can see in the top right pic. After snipping a few mm from each plug wire (the part that shoves into the coil), the problem was solved.
T509 violent misfire high revs-2006-sv1000s-spark-plug-wires.jpg

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Last edited by Speedy Russ; 05-13-2019 at 05:10 PM.
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post #3 of 10 (permalink) Old 05-16-2019, 05:08 AM
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The spark current doesn't go into any wire on triumph bikes. Only primary is wired. It's coil over plug.
Given what you show I tend to think the SV has a central coil so spark current (high voltage) is flowing through the wires.

DEcosse to confirm that.



Fred
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post #4 of 10 (permalink) Old 05-16-2019, 04:04 PM
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Quote:
Originally Posted by fredsprint View Post
The spark current doesn't go into any wire on triumph bikes. Only primary is wired. It's coil over plug.
Given what you show I tend to think the SV has a central coil so spark current (high voltage) is flowing through the wires.

DEcosse to confirm that.



Fred
Not sure about the specific differences between the SV's coils vs the T509's. Below is a pic of them with the SV's on the left. I circled the places where the wires can be twisted out of the SV's coils, clipped, and then replaced. The T509's coils are on the right. They look quite similar to me.
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post #5 of 10 (permalink) Old 05-16-2019, 04:23 PM
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Those are NOT Triumph coils - indeed they can't even be coils since they have HT leads on them
The Triumph stick coils go directly onto the plugs and there is only the Low Voltage wires on a connector that plugs directly into them

These are Gen 1 Coils



Later ones are similar, different connector



I would say the symptom is very much like a coil breaking down ............
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post #6 of 10 (permalink) Old 05-16-2019, 04:25 PM
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Quote:
Originally Posted by DEcosse View Post
Those are NOT Triumph coils - indeed they can't even be coils since they have HT leads on them
The Triumph stick coils go directly onto the plugs and there is only the Low Voltage wires on a connector that plugs directly into them
My apologies. I pulled that pic from this eBay ad: https://www.ebay.com/itm/Triumph-Spr....c100005.m1851

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post #7 of 10 (permalink) Old 05-16-2019, 04:34 PM
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^ Those are from a T3 (carburetor generation) bike and indeed are just HT cables - no coil; the coils are discrete, remotely mounted.
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post #8 of 10 (permalink) Old 05-16-2019, 05:05 PM
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Quote:
Originally Posted by DEcosse View Post
^ Those are from a T3 (carburetor generation) bike and indeed are just HT cables - no coil; the coils are discrete, remotely mounted.
Thank you for the clarification DEcosse. I have to admit my ignorance about Triumph's as I've never even changed spark plugs on any that I've owned.

I take it that the wires/cables cannot be removed from any part of the T509's assembly as they can in the SV/s? So apparently, you'd need to check for voltage with a multi meter and replace the entire assembly if bad?

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post #9 of 10 (permalink) Old 05-16-2019, 06:05 PM
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There are no HT cables at all - the High Voltage output of the coil 'stick' goes directly onto the plug cap.
You can sometimes see a difference in the resistance of the low voltage connection - however with a high rpm breakdown, this is going to be difficult to identify

TuneECU would likely report an error however and point the appropriate coil/plug as to which is the issue

@Hubba94 - was your MIL (check engine light) on when this happened?
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post #10 of 10 (permalink) Old 05-17-2019, 01:23 AM Thread Starter
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Quote:
Originally Posted by DEcosse View Post
There are no HT cables at all - the High Voltage output of the coil 'stick' goes directly onto the plug cap.
You can sometimes see a difference in the resistance of the low voltage connection - however with a high rpm breakdown, this is going to be difficult to identify

TuneECU would likely report an error however and point the appropriate coil/plug as to which is the issue

@Hubba94 - was your MIL (check engine light) on when this happened?
I persevered with it and it finally threw a code yesterday! TPS input low... the connector has been broken and doesnt quite stay on the TPS!

So I've managed to wedge it on for now with the air box pipe and all is now well.

Cheers for the input all!
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