Question about 2004 Triumph Speedmaster

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Why does the float stick on the carbs every time I use reserve?

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  • Timllfixit Mar 31, 2015

    Go on Triumph owners forums to see if it a known fault. Inline filters wont stop water by the way.

  • Timllfixit Mar 31, 2015

    Had a sudden thought, are you using gas with alcohol in it? Is the carb float needle compatible or the fuel lines. Some fuel mixes degrade the insides of the rubber lines?



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One carb or both? Looks like you have crap in the tank and when you get to the last dregs its carrying down to the carb(s). Reserve uses the last bit but normal run will take fuel from a higher level, hence cleaner running. Get a flashlight and have a look in the tank, but drain and flush it anyway.

Posted on Mar 30, 2015

Testimonial: "Hi Timllfixit, thanx for the reply but have already ruled this out as it is just the one carb every time and have fitted an in-line filter too."


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1 Answer

Fuel leek from the carbs overflow

Hi, Neil and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
Good luck and have nice a day.

Nov 02, 2015 | Motorcycles

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Possible flooding

sticking float valves in carbs is causing your problems...strip and clean carbs and reset your float heights and mixture screws..

Jan 23, 2013 | Motorcycles

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My TZR 250 3ma, leaks fuel from the carburators, I had them cleaned and the float levels resetted. On the fuel tap if it is on or on reserve it gushes out the fuel. Can the tap be the problem and is there...

The tap is not the problem, it is working as it should. The problem is that the float needles are not shutting off the fuel as they should. Turn the gas off then remove the float bowl on one carb and check for trash in the bowl. Turn the gas back on while gently lifting the float. Now lower the float. The fuel should flow when the float is lowered and stop flowing when the float is raised. If it still flows with the float raised, turn of the gas then check to see if the mechanic forgot to install the float needle by removing the pin that mounts the float/needle assembly. Most carbs attach the float tang to the needle with a small clip. Is the clip missing? The needle can get out of position and not close properly without it. The float should be light as a feather and nothing inside rattling around. A float that doesn't float will never shut off the gas. If the float is good, disconnect the gas line at the carb then get a can of carb cleaner with a "straw" to direct the spray and stick the straw into the opening where the needle goes and spray into the hole. Trash may be holding the needle open. The spray should clear the trash out. If the float floats and there is no trash holding the float open and the needle kills the gas, the floats are way out of adjustment. Below is a generic float assembly. Please take a moment and rate my answer. Thanks! tombones49_45.gif

Apr 01, 2011 | Yamaha TZR 250 R Motorcycles

1 Answer

My wr 360 ran out of fuel couldent get it on reserve in time now it wont start keeps flooding it self any ideas most thanks dom

I'm going to assume 'flooding' means gas is pouring out of the carburetor.
Chances are when you ran low on fuel some dirt got pulled into the carb & is holding the needle valve open.
You can try tapping the carb bottom with a mallet - sometime this will free-up a sticking needle valve.
IMO what is needed is to remove the carb and clean/blow everything out and reassemble. BE CAREFUL not to bend anything - esp the float.
When putting pack together check the petcock, gas tank and any air/fuel filters for contamination and act accordingly.

Dec 14, 2009 | 2002 Husqvarna WR 360

1 Answer

85 yamaha xt 600 drips gas after it has ran and

Unfortunately, there is no easy fix for this issue. You are right, you do have a float sticking. If you know what one, sometimes you can remove the bowl off the bottom of the carb without pulling the carbs all out. Not many tricks for this, just tear the bottom end of the carbs down and clean them up. Good luck

Sep 17, 2009 | 1985 Yamaha XJ 600

1 Answer

1987 dodge 2 wd pickup

You might have to tap on the sides of the carb. Its float is sticking or the needle jet is stuck.May have to remove carb to clean but most of the time tapping on the carb in different places releases the stuck float or needle..Clean thoroughly with some good carb cleaner and some additive in tank if you do not want to remove carb..Works most of the time but in carb has to much old gas build up ur varnish it will stick again..Also make sure the choke is not sticking shut..Have a great day

Apr 02, 2009 | 1987 Dodge Pickup 2WD

2 Answers

Fuel constantly leaks out of the overflow(?) tubes on bottom of carburetors Also headilght drains battery dead (when running!)

sounds like two problems. one a possible charging system failure and a carb issue. the carb issue you are haveing is what is a result of a float valve sticking. they can stick or hang open for a couple reasons, either dirt getting into the fuel line, or buildup causeing the vavle to become sticky and not function as well, or a worn float valves wont seal as well. when the float valves dont function and regulate the fuel, the excess goes out the overflow. to correct this the carbs need removed and the float valves inspected for which fault you are encountering.
the headlight drain is most likely caused from a no charge condition. with the bike running above idle. you should be able to get a 13-15volt chargeing voltage while testing at the battery terminals. 90% of the time this is caused from a faulty rectifier/regulator.

Mar 26, 2009 | 1977 Yamaha XS 650 D

1 Answer


hit reserve switched taps over and the bike did not run. Luckily there was a petrol station close by so pushed it over. Filled up and would still not start. The bike was flooded. Left it a bit and managed to get it started. Switched the taps back on and the bike runs like a bag of sh**. (Will not tick over coughingetc.). Knock the taps off and it will again run Ok until the carbs are empty. Therefore i can only assume someting is sticking in the carbs. Any ideas? What it a common carb fault that would create this problem?,The proper fix is to take the carb float bowls off and clean then ensuring that there is no stifness or notchiness on the float spindles and no dirt in the fuel inlet where the fuel cutoff seatand valve sits. A quick and dirty fix is to tap both the float bowls with a plastic or wooden screwdriver handle (or simillar) about 10times each side .... this will usually free up the floats if they are the issue .. then turn the taps on and see how it runs,,,

Nov 10, 2008 | 2007 CCM 404 Enduro

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