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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 11-19-2012, 06:19 PM   #1 (permalink)
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Bike's running odd. Gummed carbs?

Hey guys,

Turning to you to diagnose a problem I'm having with the carbs/idle. I think I have a general idea but I thought I'd take it to the table first.

I have an '05 Bonnie that was running fine until recently. I did do a whole front end swap that took about 2 months to complete and the bike didn't run much during that time. It's gotten to the point where the bike will not run without the choke wide open. Even after a 20+ mile ride I pushed the choke in and it immediately died. First thought it it's just gummed up carbs right? Should that happen that quickly? Also, I did powder coat the carb tops and reinstalled them. Would that have had any effect? I didn't think it would...

I was getting quotes around $350 to clean the carbs and reassemble. Seems high. Do I have other options? Is it possible to just spray carb cleaner in there to see if that help?

Let me know guys. Appreciate it in advance.

Pat
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Old 11-19-2012, 07:29 PM   #2 (permalink)
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It very well could be gummed up carbs, specifically clogged pilot jets. Especially with that wonderful ethanol crap in our gas now. As a service writer in a bike shop, $350 sounds about right to get the carbs out, take 'em apart, put 'em back together and reassemble the bike. It is time consuming and of course there's the cost of cleaners, rags, etc.

The problem with just spraying carb cleaner through the carb is that you need to get it into the pilot circuit. You really have to remove and strip the carbs to do it right. If the pilot circuit is blocked now, cleaner isn't going to get in there to flush it out. You will have to force cleaner into the pilot circuit and/or use compressed air to blow through the circuit.

Having said that, If you're lucky, just the pilot jets are clogged and you can remove them from the carbs without removing the carbs from the bike. Once they're cleared, maybe dose a tank of gas with some seafoam or techron to clean any accumulation out of the jets.

Have you worked on your carbs before?
I would try this, which you should be able to do on the bike; Drain the carbs. Remove the float bowls. Use a small screwdriver to remove the pilot jets. Blast them clean with carb cleaner. Put it all back together and see if it works better.

This thread shows how to get into the carbs.
http://www.triumphrat.net/twins-tech...ml#post1177161
I don't think it talks about the pilot jets but they are next to the main jets recessed up in the carb body. Maybe one of the other carb threads in the stickies has some specific info on getting to the pilot jets.
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Old 11-20-2012, 02:15 PM   #3 (permalink)
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Thanks Forrest. Carbs have been the one thing I try to avoid. I've watched over my mechanic buddies as they work on mine but they just seem so damn fickle. I have my old Honda I'm less worried about diving into but there's only one way to learn...

I appreciate the response brother!
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Old 11-21-2012, 08:30 PM   #4 (permalink)
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I had a similar problem with my carbed 08' Bonnie. After two weeks of diagnosis and basically tearing her apart I finally fixed her. Take your carb filters off and spray some carb cleaner in the intake side without the bike being on. Then fire her up and see if she revs freely. If so, rinse a repeat a few times until it is back to new. Worked for me, hopefully works for you also.
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Old 11-22-2012, 12:06 AM   #5 (permalink)
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Quote:
Originally Posted by The Bullitt View Post
Hey guys,

Turning to you to diagnose a problem I'm having with the carbs/idle. I think I have a general idea but I thought I'd take it to the table first.

I have an '05 Bonnie that was running fine until recently. I did do a whole front end swap that took about 2 months to complete and the bike didn't run much during that time. It's gotten to the point where the bike will not run without the choke wide open. Even after a 20+ mile ride I pushed the choke in and it immediately died. First thought it it's just gummed up carbs right? Should that happen that quickly? Also, I did powder coat the carb tops and reinstalled them. Would that have had any effect? I didn't think it would...

I was getting quotes around $350 to clean the carbs and reassemble. Seems high. Do I have other options? Is it possible to just spray carb cleaner in there to see if that help?

Let me know guys. Appreciate it in advance.

Pat
Did you have the carbs off the bike?

-paul-
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Old 11-22-2012, 04:44 PM   #6 (permalink)
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Check that you didn't put the carb diaphram in a bind when you replaced the carb tops. That causes all sorts of issues.
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