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| Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler. |
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11-17-2008, 12:23 AM
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#1 (permalink)
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New Member
Minitwins Favourite Bike: 2007 Thruxton
Join Date: Oct 2008
Location: Seattle
Posts: 17
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Thrux dies at lights w/o warning
I recently changed out the pipes, took out the airbox and had my bike jetted, tuned and dyno'd. Now I am finding that suprisingly with a warm/hot bike, she dies if she idles too long at a light.
There is no warning, no sputtering ... she just quickly dies. I can start her back up every time and ride her. She sounds just fine while in motion and at a stop. The only thing that I think I may hear/see is an occasional gulp or hic up of air but it is so brief and quick I can't tell if it is really happening or I am just thinking I hear it.
Any thoughts? Everyone was so crazy helpful with my other issue, your help and direction is greatly appreciated!
-Bonnegurl
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You ride like a girl, good for you!
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11-17-2008, 12:43 AM
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#2 (permalink)
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Senior Member
Formula Extreme Favourite Bike: 1966 T-120R
Join Date: Dec 2006
Location: Sunny, Florida
Posts: 420
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Sounds like the old Keihin cough is what you're hearing. Do you know what your pipe/carb jet setup is? They may have shafted you on the "rejet," and just turned out stock the pilot screws a bit without changing the main/pilot jets. Happened to me, the 1st, and last time the dealer "re-jetted" my bike. With an airbox removal and open pipes you should be in the 135-142 range on the main jets. Probably 42's on the pilots with a turn or two out. I'm at sea level with open pipes. 142-42 2 turns out. Light popping on decel. Runs like a champ!!!
Last edited by JAXTRIUMPHGUY; 11-17-2008 at 09:57 AM.
Reason: more info
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11-17-2008, 12:58 AM
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#3 (permalink)
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New Member
Minitwins Favourite Bike: 2007 Thruxton
Join Date: Oct 2008
Location: Seattle
Posts: 17
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I have TPUSA Dominator Sport pipes. Not sure what size the guys put in for me but I think for some odd reason they modeled after BC Predators. Hmmm.....I'll see if I can find the ppwk on the jet size. Thanks!
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You ride like a girl, good for you!
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11-17-2008, 01:11 AM
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#4 (permalink)
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Senior Member
Formula Extreme Favourite Bike: 1966 T-120R
Join Date: Dec 2006
Location: Sunny, Florida
Posts: 420
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Quote:
Originally Posted by Bonnegurl
I have TPUSA Dominator Sport pipes. Not sure what size the guys put in for me but I think for some odd reason they modeled after BC Predators. Hmmm.....I'll see if I can find the ppwk on the jet size. Thanks!
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Those pipes should have come with jets. If they installed the supplied jets, I would have them check the pilot screws for you, and make sure that you're idle is set correctly. Good luck.
J
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11-17-2008, 08:07 AM
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#5 (permalink)
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Lifetime Premium
Site Supporter SuperSport Favourite Bike: 2010 white tiger
Join Date: Feb 2007
Location: land of sweeping plains,drought n flooding rain
Posts: 1,015
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had similar problem .found i was much to rich at idle.I've now got pilot(40) screws in to 1.5 turns and 140 mains.I'm at sea level give or take a couple of meters.
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Last edited by cafecruzin; 11-17-2008 at 08:11 AM.
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11-17-2008, 09:41 AM
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#6 (permalink)
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Lifetime Premium
Site Supporter SuperBike Favourite Bike: 2009 Street Triple R
Join Date: Mar 2008
Location: Long Beach, CA
Posts: 1,517
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Quote:
Originally Posted by cafecruzin
had similar problem .found i was much to rich at idle.
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I think this is your problem as well. The plugs are fouling. If you could pull one right after it stalls, you could confirm it. You can temporarily get around the problem by revving the engine at lights and not letting it idle.
I'd take the bike back to those hacks and give them a good talking to.
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John
3-7-77
Some people are like Slinkies. They're really good for nothing. But they still bring a smile to your face when you push them down a flight of stairs.
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11-17-2008, 03:37 PM
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#7 (permalink)
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Senior Member
Powerbike Favourite Bike: Bonneville 750cc T140V
Join Date: May 2006
Location: England
Posts: 374 Other Motorcycle: Hinckley fake Bonnie T100
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Quote:
Originally Posted by Bonnegurl
had my bike jetted, tuned and dyno'd. -Bonnegurl
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If you gave up some of your hard earned cash for this "tune-up", then I suggest you take it back and ask them to give you what you paid for or give you you money back.
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11-17-2008, 04:06 PM
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#8 (permalink)
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Member
Super Sidecars Favourite Bike: 2007 Bonnie Black
Join Date: Aug 2007
Location: Amelia Island, Florida
Posts: 73 Other Motorcycle: 1977 T140 OIF Bobber
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same
hey, I had the same problem. Just quit at the lights. I synced the carbs(very easy to do) and raised my idle a little. Hasn't died on me since.
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11-17-2008, 04:44 PM
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#9 (permalink)
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Senior Member
Formula Extreme Favourite Bike: 1966 T-120R
Join Date: Dec 2006
Location: Sunny, Florida
Posts: 420
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Quote:
Originally Posted by Isle de Triumph
hey, I had the same problem. Just quit at the lights. I synced the carbs(very easy to do) and raised my idle a little. Hasn't died on me since.
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Your bike was just suckin' in all that Amelia sea salt!  We don't have those problems down
here in Jax. Hey, do a burnout on the Ritz lawn for me!  I lost my soul playing gigs at that place...
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11-17-2008, 06:29 PM
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#10 (permalink)
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Senior Member
SOTP Vintage Series Favourite Bike: 03 T100
Join Date: Mar 2007
Location: richmond va
Posts: 6,084
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check your vac plugs make sure there not cracked or missing
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