Question about 2009 KTM 50 SX

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KTM SX50 wont run without choke

Bike wont rev without the choke on

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Carb is running tooo lean, remove carb and strip down, removing all internal jets, check float height setting and note number of turns mixture screw is set at.......completely clean internals in a large can of carb cleaner- available at wall mart- has a basket inside the metal container so you will not loose small parts while the carb is soaking in the mixture...leave for a day, the crean all parts and blow out with high pressure compressed air. and re-assemble, and refit.....please note, never use ethanol fuel in your motorcycle, I only use classic gas in all my vehicles...less problems

Posted on Dec 27, 2013

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Posted on Jan 02, 2017

brado83
  • 106 Answers

SOURCE: runs great with choke on but continues to die when

Hey mate,

you definately have a problem with your fuel system, I would say you have had some dirty fuel thru your bike, the first thing i would check would be the fuel filter between your tank and the carby then if still does not run drain your carby bowl... after this if it still does not run you will need your fuel system/carb stripped down and flushed would recommend getting this done by a mechanic as there is alot of small parts involved...

Hope this helps

Posted on Dec 16, 2009

dmsr63
  • 2050 Answers

SOURCE: 2006 KTM 125 sx high revving out problem

Look into your power valve. If it doesn't operate freely, you won't get peak performance. They can get gummed up.

Posted on Jul 27, 2009

wayneman01
  • 301 Answers

SOURCE: bike only starts with choke on and wont idle

If your bike ran good previously - and nothing has been changed that would require rejetting or a needle adjustment, I would look for problems elsewhere. Such as:
Has the bike been stored for more than a few months at a time? If so, the carburetor jets could be plugged with fuel varnish. Only being able to start with the choke applied - and an inability to idle are both classic symptoms of this. Remove and disassemble the carburetor. Clean it and the jets out with carb cleaner and compressed air, then reassemble. Also make sure the fuel in the tank is fresh and that the fuel strainer (usually with the fuel petcock) is clean.
There are three ingredients required for combustion: fuel, compression, and a spark (at the right time). So long as you've got each of these - it has got to run.

Posted on Feb 21, 2010

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Has the bike been stored for more than a few months at a time? If so, the carburetor jets could be plugged with fuel varnish. Only being able to start with the choke applied - and an inability to idle are both classic symptoms of this. Remove and disassemble the carburetor. Clean it and the jets out with carb cleaner and compressed air, then reassemble. Also make sure the fuel in the tank is fresh and that the fuel strainer (usually with the fuel petcock) is clean.
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Hope this helps

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