Throttle not responding at random during riding! - Page 4 - Triumph Forum: Triumph Rat Motorcycle Forums
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post #31 of 118 (permalink) Old 12-10-2012, 11:11 AM Thread Starter
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Yes, very odd. I have to go to work now but will respond in detail tonight. Any more suggestions I will also respond to as soon as I get home this evening. Thanks again to everyone who is trying to help!


2005 T100 865 cc with 9500 miles
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post #32 of 118 (permalink) Old 12-10-2012, 11:26 AM
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How about the carb diaphrams ? A small split or pinprick hole could cause such a problem....they'll lift under acceleration and fall back down on steady throttle. It's worth giving them a thorough inspection before laying out cash on other things.

To check the seat's clearing the igniter put a blob of plasticine or similar on the highest part of it, secure the seat, bounce on it a few times and see if the plasticine's been marked.

Last edited by denbow; 12-10-2012 at 12:08 PM. Reason: additional info
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post #33 of 118 (permalink) Old 12-10-2012, 11:51 AM
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you need to be more specific about the issue with the throttle stopping to work, its a mechanical instrument that uses cables to open a slide, its not electric, so a failing throttle would be more obvious.
is the bike running on 1 cilinder? does it brake on the engine?
I agree on it sounding like an electrical problem, but I'd look at the battery voltage too, maybe its charging wrong/battery dead/regulator bust.
Installing new electrical parts should mean everythings fixed, but I seem to remember a brand new spark plug going bust in less than 10 minutes, and it is also possible that a faulty item was sent to you...

Last edited by sayonora; 12-10-2012 at 11:54 AM.
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post #34 of 118 (permalink) Old 12-10-2012, 01:23 PM
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Will throw in my 2 cents even though not exactly comparing apples/oranges. Years ago I had my 68 Impala tuned/oiled/etc. at a shop. Shortly after the same thing would happen - car would die while running down the highway! Turned out to be the fuel filter that was installed backward at the shop that caused the problem. They discovered the problem - fixed it - and that was the end of that. Might be related to your problem?
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post #35 of 118 (permalink) Old 12-10-2012, 01:51 PM
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Hi guys, I'm a Tiger owner so not familiar with the bike BUT some simple elimination could help here.

If it were a coil problem it would drop on to one cylinder but would still respond to the throttle, likewise any suggestion of carb diaphram, some throttle response would be evident.

If it was fuel starvation caused by a blocked tank vent, the bike would die, sit for some minutes unable to start, then start normally. While it won't start, opening the fuel cap will result in a "whoosh" of air into the tank.

If it were crankshaft sensor, it would die when hot, then restart normally once it had cooled down.

If it were a fault with the cable linkage it would do it all the time, not mysteriously fix itself.

If it has a throttle position sensor (TPS) it could be the problem, but my experience of this is that they tend to cause slight misfires, not a tickover throttle.

That only really leaves the CDI. If it's like the ones in early Tigers, Tridents etc they are know to play up so thats where I'd look

Just my two penn'th....

Sorry, had to break off as the wife brought my dinner.

Thinking about it, if you have carbs and a CDI, the CDI is only doing the ignition; the carbs and throttle cables are doing everything else so some sort of fuel starvation is the only answer. Anything else will cause misfires,a complete cut out or leave at least some throttle response.

Last edited by Bixxer Bob; 12-10-2012 at 02:39 PM.
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post #36 of 118 (permalink) Old 12-10-2012, 01:57 PM
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I have an '06 Scrambler that had a similar problem, would just cut out randomly while riding. It really scared me a couple of times. Checked through everything and couldn't find an issue. Then one time it wouldn't start. I took it in to the local dealer and they replaced the ignition control module with an aftermarket one. That was the problem. It isn't a cheap thing to try, but it sounds to me like that's what it is.
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post #37 of 118 (permalink) Old 12-10-2012, 03:20 PM
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When I had my '07 T100, it was the igniter that went out. It started dying unexpectedly, then would start right back up. Eventually, it kept dying more and more often, then died completely. Sometimes it would cut out and jerk instead of just dying. My mechanic replaced the igniter and placed an electrical box over the new igniter to protect it since it was directly under the seat. I never again had a problem with that bike. I was forced to sell it because it was too top heavy and injured my shoulder. It broke my heart to let it go. I don't know if this helps any, but that was experience with the T100.
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post #38 of 118 (permalink) Old 12-10-2012, 03:34 PM
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Originally Posted by Army Mom View Post
When I had my '07 T100, it was the igniter that went out. It started dying unexpectedly, then would start right back up. Eventually, it kept dying more and more often, then died completely.

Was this happening while the bike was at dead stop idle? I have an extra ignitor that I was considering putting on the bike and taking it for a spin to see if this would cure the bikes hiccup.

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Past rides:2008 T100, 1975 Honda CB400/4, 1989 Honda GB500, 1965 Honda CB450 Black Bomber, 1972 BSA A75 Rocket3
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post #39 of 118 (permalink) Old 12-10-2012, 04:28 PM
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I don't know about this model; is the throttle somehow controlled by electrical methods? Is the throttle cable connected directly to the carbs?
It would seem if it was an ignition problem alone the engine would die, not just go to idle.
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post #40 of 118 (permalink) Old 12-10-2012, 04:33 PM
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I'm with denbow on this ! when it happens open the gas tank filler and listen for a hiss then restart the bike. Good luck!!
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