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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 01-23-2010, 08:59 PM   #1 (permalink)
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Constant stalling

Hello, all:

I've got an '08 T100, bone stock aside from an AI removal. This started yesterday, completely out of the blue...it's long but I don't know enough to know what's relevant and what isn't:

Topped off my tank yesterday (added a little over two gallons) and went for a short 20 mile or so ride. Bike was running like a dream. I got home, parked, went inside for a few hours, and came back out to take off on the bike again.

Hit the starter, and the bike fired up. Idling a little low - probably 500-600rpm, but it will usually do this steadily even if a little cold. Usually warms up to 1100rpm or so. Went inside to get backpack and helmet while it warmed up a little (although it was 70ish outside). Came back out and bike wasn't running...stalled. Thought "must have been colder than I thought," so I set the choke and hit the starter again - spins but won't catch. I can smell the odor of gas. Turn off choke, spins but won't catch. Had to leave, so I put it back in the garage and took my car.

Today I wake up and go to start the bike. Set the choke, starts right up and idles around 1200 or so as I watch it for about a minute. Go inside to get jacket and helmet. Come back out, bike's not running. Stalled again. I turned the choke off again, hit the starter, and it started and seemed to idle fine for a few minutes.

This afternoon I decide to take it around the block for a ride. Come out, set full choke, bike starts. Idles around 1200-1300rpm for about 2 minutes and stalls. I try to start it again, spins but won't catch. I turn off the choke and try to start it without - won't catch. I twist the throttle wide open and hit the starter, and after about 8-10 seconds it catches. Seems to run fine, I keep the throttle up around 2000 for about two minutes, let it idle (around 1000rpm) and it stalls. Start it again with a twist of the throttle, it idles normally for about two minutes. I take it around the block and it seems to run fine for 5 minutes or so, then stalls as I come to a stop. I start it with a twist of the throttle and go home.

It's back in the driveway now. I can start it using the throttle (almost wide open but no choke) and it settles to its normal idle of 1000rpm but stalls almost immediately now. It stumbles once, then dies as if I had turned off the key. Once it dies I can't restart it now for 20 or 30 minutes. It won't run under 1500rpm now for longer than 20 or 30 seconds without stalling. If I keep the revs up around 2000+ it seems to run fine.

The bike has barely over 5000 miles on it. It's still under warranty and will be headed for the dealership on Tuesday when it re-opens, but if there's something I can do to get it running properly for some monday afternoon riding I'd like to do it. I think it's gotta be a fuel problem somewhere, but I don't know what.

I've been lurking here since I bought the bike, and want to thank you all in advance for your help. I know this group knows its stuff.
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Old 01-23-2010, 09:51 PM   #2 (permalink)
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Start by checking the easiest thing: Loosen the fuel cap when you start it, and leave it loose. If that resolves it, you have a venting problem with the cap.

The fact that you topped off the tank before the problem started makes me think it might be a venting issue. There are other vents, but I've never had a problem, so I'm not sure how they fit into the picture.

Others who have dealt with this will surely chime in.

By the way, I can't get mine to idle without stalling until it's thoroughly warmed up. I keep a slight pressure on the throttle whenever it's idling until it's warmed up.
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Last edited by Baltobonneville; 01-23-2010 at 09:53 PM.
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Old 01-23-2010, 10:03 PM   #3 (permalink)
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Bad gas.
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Old 01-23-2010, 10:50 PM   #4 (permalink)
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could be one of the carb float valves not closing fully. runs ok at higher rpms as its using fuel as fast as it leaks but at idle the carb fuel level rises untill it floods the engine. try tapping the carbs with a screwdriver handle and it may help seat the valve. Well its worth a try anyway.
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Old 01-24-2010, 12:21 PM   #5 (permalink)
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Tried the fuel cap thing yesterday after seeing it in another thread about stalling - no dice.

I started it this morning, full choke, and held the throttle to about 2000rpm, then turned off the choke and used the throttle to keep it at a high idle for about 2 minutes. I then let off, and it idled fine at about 1000rpm for 2-3 minutes, then stalled. This time it fired right back up, but about 30 seconds later misfired twice, but caught itself. I have never gotten "bad gas," - but is this the way it behaves? If you're going to get a bad batch, I think New Orleans would be the likeliest place in the US to find it. I normally run 89 or 91/93 octane in it.

After it recovered it seemed to idle ok until I killed it and went back inside. If it stalls again I will tap on the carbs with the screwdriver - but if the float valves are stuck that's something that needs more significant attention, isn't it?

Thank you all for your help. I was getting a little furious about this yesterday.
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Old 01-24-2010, 01:41 PM   #6 (permalink)
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Drain the gas and put in new gas from a different station. From your post it sounds like ALL your problems started after your last fill up. Bad gas will make your bike run like crap.
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Old 01-24-2010, 03:14 PM   #7 (permalink)
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Draining the gas tomorrow will be the plan. I just rode for about 30 minutes or so with 3 stalls (although my idle is set a little higher than normal which seems to help). Runs like a watch when I'm riding - no misfires, hesitation, anything - just stalls at idle sometimes.

I've also been advised to take a look at my sidestand cutoff switch, which I am going to do to cover all my bases.

Thanks again for your help.
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Old 01-24-2010, 03:38 PM   #8 (permalink)
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It doesn't sound like it could be your side stand switch. The symptoms would be different.
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2005 Bonneville Blue 790cc, AI removed, Staintunes RC, no snorkel, inlet enlarged, 118/40/NBZT "Thruxton" needles/1 shim/3 turns, Ikon 7610s, Ricor Intiminators, Dunlop GT501s, D9 gauge panel, tachometer.
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Old 01-24-2010, 03:48 PM   #9 (permalink)
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As it appears to run fine at all times except idling, I would look at the idle jets for gumming up or blockage.
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Old 01-24-2010, 05:22 PM   #10 (permalink)
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My 08 Bonneville does something similar. At idle the engine has an occasional lope or stutter. It is small but detectable. Before the motor was warmed up it will stall once in a while when I stop for a long light. I have found that if the idle is any lower than 1000 RPM the stutter can stall the engine. It has always started right back up but I have restarted seconds after the stall, not minutes later. I have about 7000 miles on the bike and never took it to the dealer about this. I did mention it at the 6000 mi service but nothing was noted, it does not happen often or predictably other than a cold motor. I just adjust the idle knob every now and then.
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