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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 04-29-2010, 05:40 PM   #1 (permalink)
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engine stalls or dies suddenly. help please?

Hi all first off i'd like to say hi to everybody i'm a newbie here second, i have a 2007 Triumph Bonneville Black and everytime i ride with a passenger my bike would die when it's running! I can always start it back up while it's cruising with the engine off and it'd ride fine but occassionaly it would die every now and then. Sometimes when i'm shifting (1st to 2nd or 3rd to 4th or sometimes when down shifting. Ive talked to a mechanic and they couldnt figure it out.
This doesnt happen when I ride bymyself (it only died on me once but that's pretty much it). Weird, huh? Me and my daughter are little people. I weight 140lbs and 5'11 would it be a weight problem for the bike? I just can't see this as a problem tho as a motorcycle has to be able to hold some average weight of the passengers.
Any advice? Please help this gets annoying already.
Thanks guys.

cheers,

aj
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Old 04-29-2010, 05:46 PM   #2 (permalink)
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There have been a few instances of the igniter unit under the seat being crushed by the seat pan collapsing, this of course gets worse with a passenger.

Remove seat and locate the igniter. See if there's a corresponding mark on the seat pan showing that there's contact between the two.

Different solutions include cutting out a piece of the seat pan to provide more clearance.

This is what the igniter looks like:



While you're there, disconnect the igniter's plug, take a close look at the connections to see if there's any corrosion or dirt on them and then plug and unplug a couple of times to shift any light corrosion.

Last edited by Forchetto; 04-29-2010 at 05:49 PM.
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Old 04-30-2010, 11:10 AM   #3 (permalink)
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Thanks Forchetto! I'm gonna check and see if the igniter has corroded or got a loose connection. I'll come back here and keep you updated.
Thanks!

cheers,

aj
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Old 04-30-2010, 12:26 PM   #4 (permalink)
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Forchetto, i checked it and everything is clean and the connection is all secure and tight. Fyi, when the engine dies while ridden it feels like when you put it in gear with the kickstand still down and the engine just cuts off like that but this happens when the bike is running.
At first, i thought i was running out of gas so i stopped and filled up and it wasn't acting up for awhile but then it still happens.
This only occurs when i'm riding with a passenger. It's so weird i can't figure out what the problem is. Could it be an electrical problem?
Thanks so much for the input though. I appreciate it, mate.

cheers,

aj
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Old 04-30-2010, 04:19 PM   #5 (permalink)
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It certainly sounds electrical from your description. Fuel problems rarely feel as on/off as you describe. Were there any witness marks on the igniter as Forchetto said? If not, I would be looking very hard for loose or chafing wires around the seat area.
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Old 05-01-2010, 10:37 AM   #6 (permalink)
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Thanks for the input Black Dog, i did check everything and look around to see if there's any loose connections but they're all pretty much tight and i don't see any mark on the seat nor on the igniter or other wire connectors. I rode it yesterday all day by myself and it didn't die at all. It runs like a champ whenever i ride it alone. But when i put somebody in the back then it starts acting up sometimes it dies once sometimes it dies several times or sometimes it doesnt die at all. It's no big deal because i can always start it back up instantly but it just makes me nervous when i have a passenger and knowing that the bike would stall anytime.
More advice, please?
Thanks so much guys!

cheers,

aj
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Old 05-01-2010, 11:51 AM   #7 (permalink)
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Is the bike stalling at idle with clutch in? Or is it stalling while underway?
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Old 05-02-2010, 02:55 AM   #8 (permalink)
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I have the exact same problem and have had it for some time, still undiagnosed. Yesterday it stalled 4 times in 4 miles. Several others have posted with the same thing and I have not heard of any resolution. I've checked all the wiring and all the connections are good. I think the passenger situation is coincidental in your case. I am beginning to suspect the kick stand cut off. I think vibration causes the side stand switch to kick the bike off randomly. Just a theory but I'm going to look into bypassing it because it's an annoying feature anyway. If anyone has more feedback on this problem I think it would be valuable to more than just the two of us. It seems very common and it's not fun in the fast lane. I literally almost got killed more than once on the freeway because of this.

If the side stand bypass or any other resolution comes, I will definitely let you and others know.
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Old 05-02-2010, 09:21 AM   #9 (permalink)
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Quote:
Originally Posted by isabelle07 View Post
It's no big deal because i can always start it back up instantly
Well, it is a big deal if it happens when you are doing 75 and overtaking a line of trucks. Or does it only happen when you slow down and let the bike idle?

For what it's worth: cutting out randomly at speed, without warning, is almost certainly electrical - a loose wire or dodgy connection somewhere. Sidestand switch would be an obvious candidate. If it cuts out when you slow down to an idle, for example in traffic, then I would be looking at the carbs for idle adjustment, air leaks etc. Different issues.
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Old 05-02-2010, 11:10 AM   #10 (permalink)
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Ok, this is mad, i rode it all day with a second passenger yesterday and it didn't stall at all! I mean it's not like i wanted it to stall but just saying.

Johnny it happens while underway and for Black Dog yeah I totally agree with you and the funny thing is i can kind of always tell when it's about to die (it's hard to explain but it would stutter a bit like the bike is running out of gas and then it dies) if the bike is already at 75mph usually it won't stall. Lesterud, what year is your bike?
You know i always thought the kickstand safety switch might be the problem and ive been wanting to try to bypass it and see if it stops the problem but i just havent had the time to do it.
You guys are brilliant for taking the time to give your input thanks so much!

cheers,

aj
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