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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 11-04-2012, 03:08 PM   #1 (permalink)
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Bonneville 2003 carb question

So I'm soon going to take out the carbs and give them a good cleaning. The bikes been sitting for a few years and doesn't start. Anyway;
I was wondering what this black cable
Bonneville 2003 carb question-imageuploadedbymo-free1352059625.294716.jpg
Is for, and if there is a special way to remove it. I gave it a thoughtful tug with no success but I didn't put enough force it, just being wary as to not damage anything!

Thanks for your time!


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Old 11-04-2012, 03:44 PM   #2 (permalink)
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That's the vacuum pipe for the Air Injection, it just pulls off.
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Old 11-04-2012, 03:44 PM   #3 (permalink)
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It's a vacuum hose connection used for balancing or synchronising the two carbs. Normally they're capped like this:



Some people connect the two carb vacuum connections together. Does that hose connect to the other carb?.
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Old 11-04-2012, 04:09 PM   #4 (permalink)
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Not that I know of, I followed the cable down and it wraps somewhere under the frame and I didn't have time to get under it.


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Old 11-04-2012, 06:33 PM   #5 (permalink)
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Are you referring to the electrical cable? It's the throttle position sensor. See link below for how to calibrate it if you remove it.

http://www.triumphtwinpower.com/tps_adjustment.php
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Old 11-04-2012, 10:19 PM   #6 (permalink)
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The TPS cable is the one under where you're pointing, connected with the two security Torx screws. Don't remove that, follow the lead up and there's a quick-connect where you can disengage it easily.

The thing you're pointing at is odd, I've not seen that. Like Forchetto said, it's normally capped. At first I assumed that someone had connected the two carbs in the (false) hopes of auto-synchronization the carbs.

But you say those tubes go down under the bike. Fascinating. You need to let us know what they're connecting to. Maybe they connect to the CA emission stuff under there, but it looks after-market to me.

I'm sure they pull right off with a little more tugging.
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Old 11-05-2012, 03:05 AM   #7 (permalink)
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Quote:
Originally Posted by Forchetto View Post
It's a vacuum hose connection used for balancing or synchronising the two carbs. Normally they're capped like this:



Some people connect the two carb vacuum connections together. Does that hose connect to the other carb?.
Im pretty sure it's part of the secondary air injection system, though its on the opposite carb than in my case.I know because I've just taken all that junk off. It links to the feeder/ filter box under the tank. Pulling it off temporarily shouldn't cause any issues at all, should just pull straight off.

Last edited by Richybow; 11-05-2012 at 04:30 AM.
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Old 11-05-2012, 05:19 PM   #8 (permalink)
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I'll be sure to post when I find out, but as soon as I was about to dig in my father decided it was too technical, taking any part apart and decided he would rather take it in. I'll be sure to talk to the person at the shop when we actually take it in. Thanks for all your help and sorry I can't give any details!


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Old 11-05-2012, 08:13 PM   #9 (permalink)
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I just removed that ribbed cable from my Bonnie today, along with several more. It's part of the EVAP (Evaporative loss system) that's fitted to California bikes. Search "Gary evaporative loss" in google and a pdf with easy instructions will pop up. To remove these hoses, just grab a pair of pliers and then tug about 1cm from the end so as to not tug on the nipples. With a good yanking they'll come off.

One thing I did was also remove the ribbed cable on the left carb that connects to the SAIS valve. I plugged both open endpoints with 3/16'' vacuum caps. I've also zip-tied the SAIS large tube that runs from the airbox to the valve.

Additionally, I don't think you should just pull the carbs because the bike isn't starting. You should probably diagnose the problem step by step in order to eliminate other possibilities that are potentially easier to remedy than pulling the carbs and overhauling them. The Haynes manual is very useful for this as is this forum.

Last edited by luckyduck; 11-05-2012 at 08:37 PM.
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