My motox bike is a ktm 250sx 2009 and when i ride it on a new spark plug it only last 1 ride then after i leave it to cool down and restart the bike it only last 5 minutes before dying and the only way to start it again is to replace the spark plug with a new 1 and the 1 i pull out is all wet as if the mix is to rich but i was already running it on a 60:1 mix ratio.
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This is a tough one but I have had similar problems with other bikes usually an upgrade for a chip in the ignition systems computer or black box.
In this case it sounds like the stator winding's. When it's cool all is well in runs normal. When heat transfers to the stator (Basically an Electric Motor with Winding's around it's poles) it expands and the winding's could be separating and/or shorting out. You could test the leads with a good ohmmeter (meg ohms) after your runs and see if there is a different reading then from when it's cold.
http://cyclehuttktm.com/FicheFinderNew/FicheFinder.aspx see figure #3
377139004000STATOR$184.99$184.99
This is not a cheap part but it should be a warranty item as new as this bike is.
Hope this helps get you in the right direction,
Best regards,
TF
Either the shift linkage could be binding or you may need to adjust the clutch. The other problem might be a synchronizer in the transmission going bad.
try changing the HT leed the spark plug cap screws into this leed if its past its sell by date the plug cap dont make good contact with the carbon fibers inside the HT leed so just change it,,,
Take the bike back to the dealer. The problem with KTM bikes is that they are so highly engineered that most riders, ( and most dealers ), have a problem getting them tuned properly. Since the bike is new, the carb should not be the problem. Don't mess with it. Have the dealer check the radiator for proper coolent level and coolent flow. If the bike has a fan, check the sensor and fan operation.
It seems your piston ring needs to be replaced since its worn out. i am saying so because of the way the bike is being used. Since its 2 stroke, engine oil from the sump is making its way int the firing chamber and depositing on your sparkplug. Therefore pay special attention to the last ring, thats the one which uses the oil for lubrication...........sodeep
Offhand, the only factor to be checked that could foul a sparkplug for your bike would be the 2T oil injector/pump. There is too much 2T oil going to the combustion chamber. Either the injector would require restricting or for some reason, there is also 2T oil in the fuel tank (pre-mix).
Good luck and Thank you for using FixYa. Happy Holidays.
yes, you are correct, those are the two pieces that could solve your problem, but i would go first for your cdi, you may choose to have it tested first also, before you jump out to buy a new one.
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