Cough/ Miss - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 32 (permalink) Old 02-10-2017, 05:29 PM Thread Starter
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Cough/ Miss

Hello all, I am new to the RAT Forum but have lurked for many years. Always been able to find the answers to my questions using the great search feature until now.

I have a 2007 Bonnie T-100 with just under 8K miles. The first owner had the Triumph dealer add BC Preds, BC airbox removal with K&N Pods and AI removal. I assume the carb was also re jeted but have not confirmed this.

Bike always fires up quickly and accelerates strong. Over the last year I have been getting an occasional cough/miss under steady throttle. It only lasts a second or two and can best be described as what you experience when you need to switch the petcock to the reserve setting.

My search results lead me to believe that possibly there is an intermittent partial fuel blockage. Am I correct that there are screens over the 2 pipes in the fuel tank that might need cleaning? Also I thought there was an inline fuel screen/filter. But for the life of me I can't see it unless it is between the carbs. The fuel line that appears OEM just goes off the petcock and dives down and disappears from view between the carbs.

So I am looking to confirm how and where to clean the fuel screens and or filter. Also any other thoughts on my intermittent but annoying cough/miss.

Thanks.
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post #2 of 32 (permalink) Old 02-10-2017, 05:49 PM
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Clean out the bowls? Have a look the parts schematics here.

RIP 2010 Bonneville Base
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post #3 of 32 (permalink) Old 02-10-2017, 11:27 PM
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There's another filter screen fitted inside the "T" piece where the fuel line connects to carbs, see photo. Also make sure the vent hose shown, that terminates under the engine, is not blocked by dirt or water or in a place prone to lots of turbulence that can upset the carburation:


Last edited by Forchetto; 02-10-2017 at 11:32 PM.
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post #4 of 32 (permalink) Old 02-11-2017, 06:37 AM Thread Starter
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There's another filter screen fitted inside the "T" piece where the fuel line connects to carbs, see photo. Also make sure the vent hose shown, that terminates under the engine, is not blocked by dirt or water or in a place prone to lots of turbulence that can upset the carburation:


Forchetto,

Many thanks for your reply.A couple of additional questions for you.

First am I correct that there are fixed screens on top of the filler tubes on the petcock ? If so is it better to take off the tank to remove the petcock or just as easy while still secured to the frame ? Also can I access this filter strainer screen without removing the carbs ?
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post #5 of 32 (permalink) Old 02-11-2017, 07:08 AM
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Originally Posted by ATL T-100 View Post
Forchetto,

Many thanks for your reply.A couple of additional questions for you.

First am I correct that there are fixed screens on top of the filler tubes on the petcock ? If so is it better to take off the tank to remove the petcock or just as easy while still secured to the frame ? Also can I access this filter strainer screen without removing the carbs ?
I don't have a carbed bike, I only learned these things bumming around on this forum. I'll let a carb man reply...
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post #6 of 32 (permalink) Old 02-11-2017, 07:48 AM
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Quote:
Originally Posted by ATL T-100 View Post
Forchetto,

First am I correct that there are fixed screens on top of the filler tubes on the petcock ? If so is it better to take off the tank to remove the petcock or just as easy while still secured to the frame ? Also can I access this filter strainer screen without removing the carbs ?
The tank must be drained of all fuel before removing the petcock I'm afraid.
The screens on the main and reserve ports are easily removed for cleaning once the thing is out of the tank.
I usually just drain the tank via the petcock, remove the tank, then place it on its side while I remove the tap so that any remaining fuel is well clear of the tap and then remove it.
Haven't had occasion to remove the lower filter, but I believe it can be removed without removing the carbs if you are sufficiently dexterous.

Phil.
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post #7 of 32 (permalink) Old 02-11-2017, 08:50 AM
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Wooly is correct on this effort, I just did it so my memory hasn't failed yet. Many people, including me, remove that small inline filter proactively. Using clean modern fuels it isn't necessary, and adds an additional 'check' on the list of poor running.

Despite my '02 being stored, ignored, and filthy when I bought it, the petcock filters looked very clean. Where I found dirt/grit was at the base, and even between the mounting gaskets. Just nip up the bolts, no need to lean on them.

Good luck -

'02 Bonneville, TORS, snorkel & baffle removed, 138 MJ's, 1 shim, 42's 1.5 turns out, K&N air filter opening enlarged, TPS removed/capped, Nology Coil, Hotwire plugs, Dart fly screen.
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post #8 of 32 (permalink) Old 02-11-2017, 10:05 AM
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Good information here for you Alt T-100 but just a reminder to come back and let these kind people (who took the time to help) know how you resolved this problem.
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post #9 of 32 (permalink) Old 02-11-2017, 10:41 AM
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Good information here for you Alt T-100 but just a reminder to come back and let these kind people (who took the time to help) know how you resolved this problem.
Very glad to see the beginning efforts of forum members here to request that those posting problems return the help they've received by either posting their steps toward resolution, or 'I gave up and took it to the dealer'. Simple courtesy.

ATL T-100, also check that your battery connections are clean and tight. When the bike 'bounces' they can loose contact if loose.
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'02 Bonneville, TORS, snorkel & baffle removed, 138 MJ's, 1 shim, 42's 1.5 turns out, K&N air filter opening enlarged, TPS removed/capped, Nology Coil, Hotwire plugs, Dart fly screen.
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post #10 of 32 (permalink) Old 02-11-2017, 10:58 AM Thread Starter
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All,
Thank you for your responses. I most definitely will reply back after this. I decided it would be a good idea to replace the 2 small gaskets for the petcock when I reinstall it. Not surprising as I have found with just about everything with the local dealers they will have to be ordered. And like everything from a dealer these thumb nail size gaskets are $3 a piece .
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