Question about 2004 KTM 625 SXC

2 Answers

Float height setting

I have a 2004 625 SXC with the flat slide carb and need to set the float height. Can anyone help me with this?

The bike is difficult to start and backfires heavily when it does and I need to eliminate this problem with the float height before I carry on to other things like timing, etc.


Mark Humphreys

Posted by on


2 Answers

  • Level 1:

    An expert who has achieved level 1.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 10 Answers

Back firing is normally an electrical problem. The carb is sometimes adjustable but needless to say, it doesn't go out of allignment on its own, so bear that in mind when trying to eliminate the carb. If it is choking when ticking over, check the idle jet setting.
Good luck.

Posted on Dec 08, 2011

  • Level 1:

    An expert who has achieved level 1.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 8 Answers

Well it depends on if the bike wont start because of to much fuel from the little tab on the float being to bent down. or not enough fuel cause of the tab being bent up a little to much. just play around with it, dont be scared to get a little dirty, you'll never get stuck with anything by using common sense. and the backfiring could forsure be coming from out of whack valves, get your valves checked. and possibly go up one size on your pilot jet n you'll be all good. check all this and if still a problem go deeper into finding wat the problem is

Posted on Feb 04, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

What is the float adjustment on the carb I know how I just need the measurement on it

Search Results

    Adjusting Carburetor Float Level - YouTube

    ? 2:06
    Oct 9, 2013 - Uploaded by Mike Nixon
    How to adjust a carburetor's float level. ... Motorcycle Mikuni CV Carburetor Cleaning for Suzuki, Honda, Yamaha Tutorial - Duration: 30:56.

    Motorcycle Carburetors ' Float Height Setting '
    Oct 17, 2014 - Learn about carburetor parts, how they work, and how to adjust thefloat height to fix your bike from running rich or lean.

Jan 11, 2016 | UM Motorcycles

1 Answer

Honda c90 1999 fuel is leaking from the overflow pipe I have had the carb off but not sure of settings can you please help

1st off no matter what any one says , do NOT try to adjust your float height !
The float height is SET on these bikes.....
I have worked on C90's for 35 years.
Get a white cloth underneath to catch any escaping parts ! & then strip the carb, removing the 2 jets & make sure they are clear.
Place items out in the order they came out....

Remove the float valve pin & needle jet .
This tiny valve is similar to a toilet cistern valve.
You have some dirt at the top of the valve.
You can use either carb or brake spray cleaner.
An airgun OR a piece of pipe attached to your mouth,
when you are happy everything is clean, re assemble.
Tick over screw is the large one with a small spring behind it, which is adjusted when the bike is running
The other smaller screw is the mixture & should be 1ans a quarter turns out from fully closed.
This screw should be LEFT alone once set !
There is also a fine mesh fuel filter underneath the fuel tap.
Be very careful when replacing the cover as the thread is very fine & CAN be stripped if over tightened.
Make sure that the slide goes in the right way, there is a small cut out on the slide for the tick over screw to push against.
If you put the slide in back to front, on initial starting the engine will rev its nuts off.
I have bought 2 or 3 bikes that have had this "problem"....
Hope this helps.
Any other questions you can find me on the message board @

Best wishes

My website

Oct 20, 2014 | Motorcycles

1 Answer

Problem with starting my bike

Sticking floats or worn float valve needles or incorrect float height, tap float bowls to see it overflow stops (sticky float), remove and clean float bowls and fuel inlet passage with carb cleaner and compressed air, check float valve for wear to the rubber tip. Reset float height by slightly bending the metal tab on the float to adjust the closing height of the valve measure from the carb bowl mating surface to the top of the float when fitted then re adjust 1mm at a time higher untill fuel doesnt over flow.

Jan 25, 2012 | 1989 Yamaha FZX 750

2 Answers

The carburetor has gas flowing from the tube vents when i turn the fuel on. i heard it has something to do with dirt or debris in the needle valve, but how do i fix this?

it may be due to a few things like:
1. The needle valve or its seat is worn. You have to change it as a set. This involves opening up the carb.
2. There may be some debris or varnish between the mating surface of the needle valve and seat which also requires opening up the carb and cleaning with carb cleaner.
3. You carb float level setting may be incorrect. You have to know the float height from the manual and then have it adjusted. There is usually a small metal under the float which is used for float height adjustment.
4. Your carb float may be stuck and this usually happens when the bike is on its side stand and not used for a long time.

Aug 14, 2011 | 2005 Yamaha TT-R 125 L

1 Answer

I have a 2003 superglide and the carb keeps building up with fuel and runs really rich and u can smell fuel .. any help

It sounds like you have a bad needle in the carb allowing the float bowl to overfill. It depends on what type of carb is on the engine as well. If it's the original Keihin CV carb, you'll have to remove the carburetor from the engine and remove the float bowl, the float, and the needle. Replace the needle and reset the float height is necessary. There is a special way of setting the float height on this carb. It must be set with the carbuetor body positioned at an angle. If you'll contact me directly at , I'll send you a picture of how to set the float level on the Keihin CV. If your bike has a different type of carburetor, let me know this and I'll try to help you with that as well. Don't forget to tell me what you need.

Good Luck

Jul 03, 2011 | 2003 Harley Davidson FXD Dyna Super Glide

1 Answer

I have a 2003 harley sportster When I Start it the over flow vent hose flows gas. What do you think the problem is? Thank you Tom

It sounds like your float level is just a bit high in the carburetor. Your bike is equipped with a vacuum operated petcock. When the engine is not running, there is no vacuum on the intake and therefore, not vacuum on the petcock. When there is no vacuum on the petcock, the fuel is turned off.

When you start the engine, vacuum is created and applied to the petcock turning on the fuel. If the float level is set too high or you have a piece of trash in the needle and seat in the carb, the float bowl will overfill and gasoline will run out of the overflow hose.

You need to take the carb off the engine, remove the float bowl, take the float and the needle out and clean out the needle and seat. Then check the float height. Now, this is an area where you need a manual. The float sets with the carb on a 15° to 20°angle. With it on this angle, you set the height to 0.413-0.453" from the carburetor flange surface to the top of the float. I usually try to set the float at the lowest fuel level setting with would be the 0.453" setting.

Good Luck

Sep 21, 2010 | Harley Davidson XLH Sportster 883...

1 Answer

Floats not set

Float tabs come set flat to surrounding plate, bend up to decrease level and down to raise level. Raised level too much and you risk fuel overflow on sustained inclines and too low a level and you will lean out at high revs and damage valves/piston real quick. There is no set level to speak of, but better to err on the side of losing a bit of overflow. The overflow drains from the carby via a plastic hose from just above float bowl flange.

Apr 28, 2010 | 1996 Suzuki GSX 750 F (Katana)

1 Answer

Gas running from carb when the bike is running or not

Sounds like your float needle is not seating properly, or your float height is incorrect, or you have trash in the carb. It will need to be taken apart, cleaned, and the float height set. Look at the float needle for wear on the tip.

Aug 07, 2009 | 2004 Yamaha YZ 450 F

2 Answers

KDX200 carb float set up. Hi I have gas coming

If you have gas coming out of the overflow tube, you need to make sure the float valve is shutting the gas off properly. The float height would have to be awfully high to cause gas to come out the overflow. You might be able to do it on the bike but it's a lot easier to do off the bike. Pull out the float valve and inspect the tip. Make sure it is smooth with no evident nicks or deep grooves.

Apr 18, 2009 | 1998 kawasaki KDX 200

1 Answer

Cleaning carbs on Suzuki GS650 L, what is the float setting?

to check the float height, invert the carb body holding the float arm pin so the pin will not slip off. With the float arm kept free, measure the height it should be 22.4 + or - 1.0mm
This is what the shop manual says.
basically what that means turn the float bowl upside down and keep the bottom of the float even with the edge of the bowl.

Apr 10, 2009 | 1982 Suzuki GS 650 GT

Not finding what you are looking for?
2004 KTM 625 SXC Logo

Related Topics:

345 people viewed this question

Ask a Question

Usually answered in minutes!

Top KTM Experts


Level 3 Expert

77169 Answers


Level 2 Expert

342 Answers

Arnie Burke
Arnie Burke

Level 3 Expert

4536 Answers

Are you a KTM Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides