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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 12-09-2012, 09:39 AM   #1 (permalink)
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Throttle not responding at random during riding!

I have a triumph Bonneville t 100 2005 with 10,000 miles on her. I did a lot of repairs lately, changed the pickup coil, cleaned carbs and just about every other alteration that has been mentioned on this site for when the bike suddenly dies on the road in mid riding.

Without going into great detail (on the bike just turning off and dying part) the newest problem is while riding the throttle stops responding with the bike on. If I am cruising along at 70 MPH with a fixed position on the throttle, it is as if all of a sudden the bike just acts as if you stopped giving it gas and starts to slow down or sometimes jerks... if I rev the engine I get no response, the throttle seems to be dead or disconnected. Then as Iím coasting to pull over, just as mysteriously as this began, it comes ďback to lifeĒ and starts to respond again. This happens several times mid ride and is very dangerous.

Please note when this occurs the bike is still running and has full power. It is just as if the throttle or the cable is disconnected or something.

I did take the throttle cables off when I cleaned the carbs but I thought I put everything back exactly as was and I checked all of the throttle cables and nothing looks out of the ordinary.

Any have any suggestions or have this happen before?

Cheers

RJ
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Old 12-09-2012, 09:52 AM   #2 (permalink)
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Quote:
Originally Posted by RJ Triumph View Post
I have a triumph Bonneville t 100 2005 with 10,000 miles on her. I did a lot of repairs lately, changed the pickup coil, cleaned carbs and just about every other alteration that has been mentioned on this site for when the bike suddenly dies on the road in mid riding.

Without going into great detail (on the bike just turning off and dying part) the newest problem is while riding the throttle stops responding with the bike on. If I am cruising along at 70 MPH with a fixed position on the throttle, it is as if all of a sudden the bike just acts as if you stopped giving it gas and starts to slow down or sometimes jerks... if I rev the engine I get no response, the throttle seems to be dead or disconnected. Then as Iím coasting to pull over, just as mysteriously as this began, it comes ďback to lifeĒ and starts to respond again. This happens several times mid ride and is very dangerous.

Please note when this occurs the bike is still running and has full power. It is just as if the throttle or the cable is disconnected or something.

I did take the throttle cables off when I cleaned the carbs but I thought I put everything back exactly as was and I checked all of the throttle cables and nothing looks out of the ordinary.

Any have any suggestions or have this happen before?

Cheers

RJ
Check out the connections to the igniter.
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Old 12-09-2012, 12:20 PM   #3 (permalink)
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Check out the connections to the igniter.
Hi Ripper,

Have you had the same experience or heard of this before? Has the igniter connections been the issue?

Where would the igniter and the connection be? I am not familiar with it at first glance.

thanks
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Old 12-09-2012, 01:07 PM   #4 (permalink)
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Have you checked both connections to the battery? I had this issue with my bike as well.
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Old 12-09-2012, 01:08 PM   #5 (permalink)
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Where would the igniter and the connection be? I am not familiar with it at first glance.

thanks
It would be the box under the seat bolted to the frame just behind the battery.
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Old 12-09-2012, 01:41 PM   #6 (permalink)
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Hi Chris,
Iím not following how the connections to the battery would be in play here as the bike still had full power, the throttle just stopped responding as if I hadnít been turning it.

Ah yes! The CDI box, I have attached this and reattached this many a time but no dice. Iím not sure if that is it or not but it still weird that the throttle just stopped responding.

Thanks for the response though I appreciate your suggestions. Anyone else out there have an idea?

Russell
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Old 12-09-2012, 02:41 PM   #7 (permalink)
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Quote:
Originally Posted by RJ Triumph View Post
Hi Ripper,

Have you had the same experience or heard of this before? Has the igniter connections been the issue?

Where would the igniter and the connection be? I am not familiar with it at first glance.

thanks
I haven't had this same experience myself since my Bonnie is an EFI model, but the reason I thought of the igniter is because there are lots of threads on here from guys with carbed bikes, suffering the same symptoms as yourself and more often than not it turns out to be the igniter unit. It seems to be notorious for its unreliability because of the place where Triumph chose to bolt it on.

I know that in your last post you said you had checked the igniter a few times, but because of its position under the seat, one of the main complaints about it is that the rider puts pressure on the igniter by his wieght sitting on the seat. This apparently can make the connector temporarily or permanently lose contact. From the number of threads I've read about it, its worth checking out in depth.

Other things I would check out are the fuel filter (in the fuel line between the carbs) and make sure that the tank vent pipe is clear.

Last edited by Ripper; 12-09-2012 at 02:47 PM.
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Old 12-09-2012, 02:54 PM   #8 (permalink)
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Something to check is the fuel tank breather pipe. If that's blocked a vacuum is created leading to fuel starvation. Make sure it hasn't been pinched and also the end where it exits underneath the bike is clear and not blocked with road gunge.
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Old 12-09-2012, 02:57 PM   #9 (permalink)
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I'm thinking fuel delivery. Classic symptom is losing power then things mysteriously return to normal when you pull over for a few minutes and the float bowls have a chance to refill.
Fuel flow could be just enough to sustain steady throttle but not enough for hard acceleration, which drains the float bowls and causes the engine to lose power. Check the little fuel filter in the nipple that the fuel line slides on at the bottom. Check for kinks or pinches in the fuel line. Drain the float bowls in case you caused something to flow down into them when you had the carbs off. Check the vent hoses for the carbs and the vent for the tank for pinches or blockage.
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Old 12-09-2012, 08:32 PM   #10 (permalink)
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Thanks guys for your responses,

Yes the fuel lines are clear and all good. I took those apart and thoroughly cleaned all of the components recently. Itís not fuel starvation either as the vent hoses and fuel lines are looking good. I can re-empty the float bowls if you think that will do the trick? Although they are both clean...

When I am riding it just all of a sudden starts idling even when the throttle is opened in the exact same position. In other words, doing 70 mph, throttle twisted open about 2 inches, cruising along for 30 minutes, all of a sudden itís as if I let go of the throttle and the bike is in neutral even though I have not adjusted my hand position or changed anything. I twist the throttle to rev the bike and bring the RPMís back but it does not respond at all and I have to coast to the side of the road. The bike is idling and not connected at all to the twisting motion of the throttle grip. After a few minutes the bike starts to respond as if it never had a problem. So weird.. any thoughts?

Thanks RJ
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