Question about 2002 KTM SX 125

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Choking up my ktm starts fine with lots of compression but dosen't seem to run very well it's like the choke is always on.. my fuel mixtures are good.. so can anyone help

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Try lowering your oil/petrol mix ie 100ml oil-4.5l petrol (if premix), if not change spark plug to hotter grade (whatever plug number is go down a number)

Posted on Feb 21, 2009

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1 Answer

Why doesn't it idle unless choke is on?


Maybe you are running too lean. When the choke is on it reduces (chokes) the air being drawn in meaning higher fuel to air mixture (richer because of more fuel and less air). Turn the choke off and more air is drawn in and the fuel to air mixture is reduced. There should be a mixture screw where you can alter the mixture to the required setting for normal running.

Feb 16, 2016 | 2004 KTM SX 450 racing

1 Answer

Won't start


Check the fuel level in the float chambers of the carbs, it could be too low! Readjust the float to obtain correct level. Blow out the primary and main jets with compressed air.
Hope you adjusted the air screw mixture at the right temperature of the engine i.e. you need to warm it up and than adjust also check the valve clearance of the engine.
Hope this helps

Aug 06, 2014 | Suzuki GSX 750 F (Katana Motorcycles

1 Answer

Ktm 85 2014 wont start seems to be flooding, just purchased yesterday and was fine, then last night it suddenly won't start, like its flooding? Any suggestions?


Could be. Did you turn the fuel valve off last night?
Try starting with no choke holding throttle open about half way..

Mar 30, 2014 | 2014 KTM SX 85

1 Answer

KTM SX50 wont run without choke


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

Dec 27, 2013 | 2009 KTM 50 SX

1 Answer

My son's KTM 50 senior pro doesn't start. has petrol vapour coming out of the pipe.


The engine is running too rich. The carburator needs tuning to get the fuel mixture correct or the choke may be stuck in a partially closed position.

Feb 11, 2012 | 2006 KTM 50 Senior Adventurer

1 Answer

Fully rebiult engine has good spark and fuel but will not start


assuming this is an electric start 4 stroke, is it winding over fast enough? Try put a set of jumper leads on it to make it wind over faster. I'm in New Zealand and the fuel here is ****. If my bike sits for more than a few days I drain the carb before trying to start it. Then I give one or two twists on the thottle and with one hand on the choke I push the start button without touching the thottle and as soon as it fires pull the choke out. After about 10 to 20 seconds push the choke back in and should be running fine. This seems to be the best way to start my bike.

Sep 04, 2011 | KTM SX 450 racing Motorcycles

1 Answer

Why does 2002 honda xr50 run better with choke at half way instead of off


The jets are a little clogged or gummed up. Clean the carburetor jets and it will run better with the choke off. What happens is with the choke off, there is too much air and not enough fuel in the air fuel mixture because not enough fuel is passing through the jets but the same amount of air is always allowed. With the choke on, you are restricting the amount of air flow which helps to correct the fuel/air mixture into the engine. To clean the jets, you will remove the float bowl from the bottom of the carburetor, there will be at least two jets (sometimes up to four) in the bottom of the carb, remove both jets and use carb cleaner and compressed air to clean them. DO NOT USE any type of tool because it can scar the jet passage and change the fuel flow as well. Also be sure to use the proper screw driver to remove the jets since if you damage them it can also change the fuel flow. Also, when removing the jets, be aware of any washers or spacers that may be in place when removing. Good luck

Jul 04, 2010 | 2002 Honda XR 200

1 Answer

Bike only starts with choke on and wont idle .by the way its a ktm 250 xc 2006.air filter is clean and has new plug . wondering about needle adjustments?


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.

Feb 21, 2010 | 2008 KTM 250 XC

1 Answer

Starting problems


Check the compression. If it has low compression it will always be difficult to start. I have the same bike. It is a really good starter, comparatively to other older 'cycles I own. 1) Check the fuel level in the tank, and be sure to turn the fuel switch (left side of bike below tank and seat) to On, or even Reserve 2) In stock tuning, my bike likes full choke for cold start, in any ambient temperature, it likes to warm up with the choke on, until it starts to sputter from the rich mixture. 3) I believe this bike has vacuume tube that goes to the fuel petcock, this shuts off fuel to carbs when bike is not running. Thus if the bike has not run in a while, or the carbs drained, it will take several start attempts to get the carb float bowls filled. 4) This bike is hard to start if the battery is old or marginally charged. 5) Also pull the spark plugs, if they are brown, or black, change them. 6) check the air cleaner, if it is too dirty it will essentially act like a choke

Nov 10, 2008 | 1998 Honda CBR 600 F(3)W

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