Carb troubleshooting - Triumph Forum: Triumph Rat Motorcycle Forums
» Main Menu

Discussion Forums
 » Twins
 » Tiger
 » General
 » RAT

Features
 » Blogs

Motorcycle.com Links

Contribute
 » Photo

Motorcycle Forums
» Insurance
» Sponsors
» Our Partners
»ATV Reviews
»Motorcycle Games

Twins Talk Discussion of Hinckley Triumph Twin related matters and topics. Sponsored By: Throttle Mojo

Reply
 
LinkBack Thread Tools Display Modes
Old 12-03-2012, 04:29 PM   #1 (permalink)
Senior Member
Formula Extreme
Main Motorcycle: 2014 Thruxton
 
eric nyc's Avatar
 
Join Date: Sep 2012
Location: Brooklyn
Posts: 603
Carb troubleshooting

Three weeks ago I had my carbs cleaned and rejetted and had larger pilot jets installed. Since then I've ridden about 300+ miles with no problems whatsoever. Yesterday I was riding back from the city and after about 5 miles the engine started sputtering. By the time I got to the next light it had died. I managed to start it again, but when I gave it any throttle it immediately sputtered and died. If I didn't know better, it sounded like it was out of gas. Aside from the fact that there was still more than a half tank left, I tried switching to reserve. No difference. After a few starts and stalls, it finally wouldn't start at all, even with full choke. Worried about draining my battery, I tried calling the garage that did the carb work since I assumed it had something to do with them, but they were closed. Ended up spending a couple hours watching a football game in a bar next door. When I came out I decided to give it one more try for the hell of it. Engine started right up with no choke and I was able to give it some throttle for about 30 seconds before it sputtered and died again. Called a cab and went home.

Garage still closed today (open tomorrow) but I had to at least move the bike to avoid a ticket so I took a cab back this afternoon. Bike started right up with normal choke, throttled fine. I wasn't that far from home and I had to move it anyway so I decided to try and make it. First thing I did was stop at a gas station a block away and top off the tank, just in case. Sure enough, more than half a tank left. A few blocks from the gas station she started sputtering again and died once at a red light. Was able to get her started and byt the time I got home she was running like nothing was wrong. I checked the petcock and the fuel line, everything seemed fine. wrapped the carb floats a few times with a screw driver to make sure they weren't stuck. Took it out around the neighborhood for about 30 minutes with no problems.

So any theories? I still want to take it back to the garage since they have a 30 day warranty on their work and I have to believe it had SOMETHING to do with them disassembling the carbs, but I'm worried they'll say it's something with the fuel system and they hadn't touched that so now I have to pay for the diagnostic.
eric nyc is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 12-03-2012, 04:47 PM   #2 (permalink)
Senior Member
Formula Extreme
Main Motorcycle: 2012 T100
 
norton74's Avatar
 
Join Date: Jun 2012
Location: Stockbridge, MI
Posts: 759
Other Motorcycle: 2013 Rocket 3 Touring
Extra Motorcycle: '73 Ducati GT750
Maybe your fuel tank cap vent is not working properly.

Maybe it got fouled while you helping all those people right after Sandy.

BTW, thanks for your good deeds.

Last edited by norton74; 12-04-2012 at 06:49 AM.
norton74 is offline   Reply With Quote Quick reply to this message
Old 12-03-2012, 05:02 PM   #3 (permalink)
Senior Member
SuperSport
Main Motorcycle: 2003 Triumph T100
 
Sheepdog's Avatar
 
Join Date: Nov 2005
Location: Waldheim, LA
Posts: 1,397
Other Motorcycle: 2007 M-G Cali Vintage
Could be your fuel tank vent; if blocked they will stop the flow of fuel. Check out your vent line and rollover valve (the vent line is visible just above the intake rocker cover on the bike's right side). If the vent line is pinched or if the rollover valve is malfunctoning, your fuel flow will stop.
__________________
2003 Bonneville T100 and 2007 Moto Guzzi California Vintage
Sheepdog is offline   Reply With Quote Quick reply to this message
Old 12-03-2012, 05:15 PM   #4 (permalink)
Lifetime Premium
Site Supporter
Formula Extreme
Main Motorcycle: 2006 Thruxton CaspianBlue
 
Join Date: Jan 2011
Location: Southern California
Posts: 525
Other Motorcycle: HDtouring Hondaoffroad MX
Extra Motorcycle: YES...
I agree with the above suggestions about fuel...also
It might also be a clogged in tank fuel filter (above the petcock)
gummed up with a varnish type crap caused rapidly by ethanol
laced fuel. One thing I always do and recommend to you is get
some clear fuel line so you can see when fuel is flowing to carbs.
Von Dutch is offline   Reply With Quote Quick reply to this message
Old 12-03-2012, 06:29 PM   #5 (permalink)
Senior Member
Formula Extreme
Main Motorcycle: 2014 Thruxton
 
eric nyc's Avatar
 
Join Date: Sep 2012
Location: Brooklyn
Posts: 603
Please forgive my ignorance. Looked under the fuel tank and found a black hose not attached to anything that runs back into the air filter box with an L curve in it. Directly above that is a small spigot protruding from the underside of the fuel tank. To my untrained eye it sure looks like that hose is positioned to be attached to that spigot, but there is no fastening hardware or sign that there ever was one. Looked through the Haynes manual and couldn't find any reference. Is this the tank vent you guys are talking about? Seems clear now which could explain why the bike SEEMS to be running fine now. But I'm nervous about getting it to far from home/garage in case it happens again.


Sent from my iPhone using Motorcycle.com Free App
eric nyc is offline   Reply With Quote Quick reply to this message
Old 12-03-2012, 07:08 PM   #6 (permalink)
Senior Member
World SuperBike
Main Motorcycle: 2005 T100
 
Sal Paradise's Avatar
 
Join Date: Mar 2008
Location: Hudson Valley , N.Y.
Posts: 2,008
Other Motorcycle: 1974 Yamaha YZ
That's the vent Eric. Its just slips on. If and when the problem reoccurs you can try taking off the fuel cap to manually vent the tank, just as a test.
__________________
Sal Paradise
Sal Paradise is offline   Reply With Quote Quick reply to this message
Old 12-03-2012, 07:09 PM   #7 (permalink)
Senior Member
SuperBike
Main Motorcycle: '06 T100
 
Bron-Yr-Aur's Avatar
 
Join Date: Oct 2011
Location: Windber, PA (formerly Jax FL)
Posts: 1,698
Other Motorcycle: Kawasaki KXdirtshredder
Yes that is the vent. It just slides on, no clamps necessary. At least, since that wasn't connected, you know the venting wasn't the problem.

Regarding your OP, no worries about a 'fuel system' that they can blame. There is none, unless you consider the fuel line and filter to be that system. Have you checked/cleaned the tiny inline filter at the carbs? I seriously doubt the shop did, especially considering they forgot to hook up the vent tube.
__________________
(The artist formerly known as kreemsicleT100)

"Ya can't have 'no' in your heart. Life's a garden. Dig it." - Joe Dirt
"If y'ain't first, yer last." - Ricky Bobby
Bron-Yr-Aur Garage
Bron-Yr-Aur is offline   Reply With Quote Quick reply to this message
Old 12-03-2012, 07:15 PM   #8 (permalink)
Senior Member
Formula Extreme
Main Motorcycle: 2014 Thruxton
 
eric nyc's Avatar
 
Join Date: Sep 2012
Location: Brooklyn
Posts: 603
Quote:
Originally Posted by kreemsicleT100 View Post
Yes that is the vent. It just slides on, no clamps necessary. At least, since that wasn't connected, you know the venting wasn't the problem.

Regarding your OP, no worries about a 'fuel system' that they can blame. There is none, unless you consider the fuel line and filter to be that system. Have you checked/cleaned the tiny inline filter at the carbs? I seriously doubt the shop did, especially considering they forgot to hook up the vent tube.
Is that the small filter inside the clear portion of tubing below the petcock? I compressed the hoses on either side and fuel seemed to be flowing freely there but I don't think it's been cleaned. As far as the shop reattaching the vent hose, I can't say they DIDN'T as I could just as easily imagine it came loose on its own with no clamp. This was the first time I noticed it. What function does reattaching it serve? If its as vital as assuring fuel supply to the carbs why is it just a slip on fit?


Sent from my iPhone using Motorcycle.com Free App
eric nyc is offline   Reply With Quote Quick reply to this message
Old 12-03-2012, 07:52 PM   #9 (permalink)
Senior Member
SuperSport
Main Motorcycle: 2003 Triumph T100
 
Sheepdog's Avatar
 
Join Date: Nov 2005
Location: Waldheim, LA
Posts: 1,397
Other Motorcycle: 2007 M-G Cali Vintage
It both vents the fuel tank and prevents spilling in the event that the bike is laying on its side. In days gone by, the tank was vented by a hole in the gas cap. However, these days the EPA frowns on the atmospheric release of gasoline fumes, so the vent is connected to the airbox to facilitate the burning of those evil vapors...
__________________
2003 Bonneville T100 and 2007 Moto Guzzi California Vintage
Sheepdog is offline   Reply With Quote Quick reply to this message
Old 12-03-2012, 11:54 PM   #10 (permalink)
Senior Member
SuperBike
Main Motorcycle: '06 T100
 
Bron-Yr-Aur's Avatar
 
Join Date: Oct 2011
Location: Windber, PA (formerly Jax FL)
Posts: 1,698
Other Motorcycle: Kawasaki KXdirtshredder
Quote:
Originally Posted by eric nyc View Post
Is that the small filter inside the clear portion of tubing below the petcock? I compressed the hoses on either side and fuel seemed to be flowing freely there but I don't think it's been cleaned. As far as the shop reattaching the vent hose, I can't say they DIDN'T as I could just as easily imagine it came loose on its own with no clamp. This was the first time I noticed it. What function does reattaching it serve? If its as vital as assuring fuel supply to the carbs why is it just a slip on fit?


Sent from my iPhone using Motorcycle.com Free App
It would never just work loose, since its not pressurized. As fuel empties from the tank through the petcock, it creates a vacuum in the tank. Something needs to fill that space, so the vent tube allows air into the tank. If it's blocked, it's like sucking water through a straw, the fuel will never reach the carbs. But it's just at atmospheric pressure, so no problem with it falling off.

The filter I was referring to is in the fuel supply line. Follow the fuel line from the petcock to the carb. The filter is in the black T-junction where the fuel line attaches. Just pull the line (carefully) and the filter will either be in the black plastic or still stuck in the line. Needle nose pliers to perform that surgery. It probably will be fairly clean, but at least you'll be able to eliminate that possible gremlin.
__________________
(The artist formerly known as kreemsicleT100)

"Ya can't have 'no' in your heart. Life's a garden. Dig it." - Joe Dirt
"If y'ain't first, yer last." - Ricky Bobby
Bron-Yr-Aur Garage

Last edited by Bron-Yr-Aur; 12-03-2012 at 11:57 PM.
Bron-Yr-Aur is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Triumph Forum: Triumph Rat Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter your valid email address, that can receive an automated confirmation message. Otherwise, you won't be able to gain full access.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Troubleshooting low rev hesitation. pete312 Hinckley Classic Triples 25 07-23-2012 11:44 PM
Troubleshooting my 67 T120R WutUpCuuuz Twins Technical Talk 0 03-17-2012 05:39 PM
t509 troubleshooting! ag04 Speed Triple Forum 64 12-31-2010 06:44 AM
troubleshooting chrisjames Triumph SuperSports 5 09-12-2008 06:10 PM
Troubleshooting help? TT600n00b Triumph SuperSports 9 09-21-2007 10:08 AM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -4. The time now is 06:14 AM.



Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Motorcycle News, Videos and Reviews
Honda Grom Forum Harley Davidson Forum Honda 600RR Kawasaki Forum Yamaha R6 Forum Yamaha FZ-09 Forum
1199 Panigale Forum Roadglide Forum Honda CBR1000 Forum Vulcan Forum Yamaha R1 Forum Yamaha R3 Forum
Ducati Monster Forum Harley Forums Honda CBR250R Forum ZX10R Forum Star Raider Forum Yamaha Viking Forum
Suzuki GSXR Forum V-Rod Forums Honda Shadow Forum Kawasaki Motorcycle Forum Star Warrior Forum KTM Duke 390 Forum
SV650 Forum BMW S1000RR Forum Honda Fury Forum Kawasaki Versys Forum Drag Racing Forum Ducati 899 Panigale Forum
Suzuki V-Strom BMW K1600 Triumph Forum Victory Forums Sportbikes BMW NineT Forum
Volusia Forum BMW F800 Forum Triumph 675 Forum MV Agusta Forum HD Street Forum Suzuki GW250 Forum
Yamaha Motorcycles Victory Gunner Forum Honda Vultus Forum HD LiveWire Forum Ninja H2 Forum Ducati Scrambler Forum

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.