Question about 2004 KTM 625 SXC

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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

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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

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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


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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

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1 Answer

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