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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 12-10-2012, 09:44 AM   #21 (permalink)
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Originally Posted by RJ Triumph View Post
You guys are funny, but back to the dangerous issue of the throttle just dying and the bike acting as if it is in neutral and as if you are not twisting the throttle at all, yes it is still happening.

Any suggestions?

thanks
I know that most people in this thread have suggested parts of the fuel system as the culprit but from the way you described the problem I can't help feeling that its electrical. Though I can't get my head around what you describe as the bike 'acting as if in neutral'. Are you saying that when the engine dies, there is no 'engine braking'? Does the gearbox disengage leaving the engine free revving? Or is it more like someone has switched off the ignition, or you have let go of the throttle? Because that is another item that I've seen a lot of posts on, corrosion or wet in the ignition switch itself. Yet another part notorious for its unreliability.

What you need to do is eliminate that igniter first. AFAIK there is no way of testing them so you would need to borrow a known working igniter and swap it over for testing. Another thing that could, in theory produce the same symptoms is the crank position sensor (the coil inside the alternator case). Check the gap on that and also its resistance with a multimeter. Forchetto should be able to tell you what reading you should get.

Last edited by Ripper; 12-10-2012 at 09:51 AM.
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Old 12-10-2012, 10:01 AM   #22 (permalink)
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Quote:
Originally Posted by RJ Triumph View Post
You guys are funny, but back to the dangerous issue of the throttle just dying and the bike acting as if it is in neutral and as if you are not twisting the throttle at all, yes it is still happening.

Any suggestions?

thanks
I'm sorry, lighthearted pokes at our Colonial Cousins aside , as I said, I may be wrong here, but the EMU controls the whole shebang, unless your throttle cables have slipped (which would be really obvious, as per slack cables), I would tentatively suggest the engine management unit may be feeding the wrong commands in here? Anybody? Help!!!

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Old 12-10-2012, 10:04 AM   #23 (permalink)
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And WHO gave them permission to change the format, hmmm?????
The pitiful part is, if we're so open to changing things, why are we stuck in the stone ages regarding SAE vs. metric?! Now to work on a modern'American' vehicle, we have to have 2 sets of tools, so I guess things may slowly be moving that way, but my grandmother moves faster...

Anyhow, I digress. I agree with Ripper on it sounding electrical. RJ, didn't you just recently install a new pickup coil? If so, we can rule that out. When I read the OP, it sounds to me like the bike shut off. When this happened, did you pull in the clutch? I have a feeling the bike would have shut off if you did, because that's the exact way my igniter went on me.

Sorry you're having these problems. I know you've been at this for many months. A possible problem could be the coil, but the igniter is such a frequent problem that I'd, at least, be prepared for that possibility.
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Old 12-10-2012, 10:25 AM   #24 (permalink)
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I'm sorry, lighthearted pokes at our Colonial Cousins aside , as I said, I may be wrong here, but the EMU controls the whole shebang, unless your throttle cables have slipped (which would be really obvious, as per slack cables), I would tentatively suggest the engine management unit may be feeding the wrong commands in here? Anybody? Help!!!

Since the bike in question is a 2005 T100 it does not have an EMU. These are only on EFI bikes (about 2008 onwards).
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Old 12-10-2012, 10:29 AM   #25 (permalink)
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Since the bike in question is a 2005 T100 it does not have an EMU. These are only on EFI bikes (about 2008 onwards).
That doesn't help. Well at least we know it's not that then. Thats the second time today I have made myself look foolish, I'm gonna shut up!

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Old 12-10-2012, 10:32 AM   #26 (permalink)
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QUOTE
"My Thruxton was misbehaving and they found a loose connector block under the tank. Check all those. And that one on the side of the throttle bodies.....I was eyeing that with suspicion the other day......thats right in a place that will get really wet!

Don't go fiddling around with the black plastic one on the side of the carb or you WILL have trouble

KREEMSICLE T100. To make things even more complicated we Brits are still half metric and half imperial in some things. We buy our petrol (that's gas in your language) in litres and use miles per gallon. Our weights are mostly metric, distances in miles. ...go figure that one out.

Last edited by denbow; 12-10-2012 at 10:45 AM. Reason: Addition
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Old 12-10-2012, 10:42 AM   #27 (permalink)
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That doesn't help. Well at least we know it's not that then. Thats the second time today I have made myself look foolish, I'm gonna shut up!

Not really mate, I get confused myself sometimes. The important thing on this forum is to throw in your 2p worth. Yes, about the little black thing on the side of the carb/throttle body.. that's the throttle position sensor and as the other poster says, you will get trouble if you play around with that.
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Old 12-10-2012, 10:56 AM   #28 (permalink)
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Thanks for all of the reply’s,

Yes I have a brand new Pickup coil installed, nology spark plug boots, new plugs, everything is new but the CDI box. The bike does still cut out but that is for another post. (I will try raising the seat off the CDI box with washers as this is the last thing I have not done)
The problem that tis more concerning at the moment is that the bike is running but all of a sudden it just stops recognizing the turning of the throttle. I can twist away, and the engine doesn’t rev and doesn’t recognize the twisting motion of the throttle (as if im not twisting it at all) the bike just idles and is running. Go figure?

Thanks RJ
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Old 12-10-2012, 11:17 AM   #29 (permalink)
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Originally Posted by RJ Triumph View Post
Thanks for all of the reply’s,

Yes I have a brand new Pickup coil installed, nology spark plug boots, new plugs, everything is new but the CDI box. The bike does still cut out but that is for another post. (I will try raising the seat off the CDI box with washers as this is the last thing I have not done)
The problem that tis more concerning at the moment is that the bike is running but all of a sudden it just stops recognizing the turning of the throttle. I can twist away, and the engine doesn’t rev and doesn’t recognize the twisting motion of the throttle (as if im not twisting it at all) the bike just idles and is running. Go figure?

Thanks RJ
Its beginning to sound like a possible culprit could be the TPS as well as the igniter (well, and/or). To my knowledge the TPS can be checked with a multimeter across its connector (unplugged, without removing the sensor) and the resistance read whilst operating the throttle slowly. It works like a volume control of a stereo, and just like those, its wiper can lose contact with the track. I think if this happened the igniter would be fooled into thinking that the throttle is closed.

Also I'm beginning to clutch at straws now, this is very baffling indeed. Does this always happen at around the same RPM?
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Old 12-10-2012, 11:23 AM   #30 (permalink)
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Hmm, that's odd. Have you inspected where you removed the cables from the carbs to make sure the locking nuts haven't worked loose? They should be good and tight on the bracket.

I wonder if something could be working loose in the throttle assembly?
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Last edited by Bron-Yr-Aur; 12-10-2012 at 11:29 AM.
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