Question about 2008 KTM 250 SX
2008 model KTM 250 SX from the day of the purchess we having problems with spark plugs. After worming up the bike 10-15 minutes of riding if we go to have a rest, we switch off the engine. When we restart its start with no problem but after a little idoling we wont to go for next ride the bike just loose the power and die. Only way to restart the bike is change the spark plugs for new one. We believe so that is the big problem with something we canot explain. The enjoyment off the riding the bike is spoiled by this incident which occure on regular basses. I had before 2000 model 250 SX where i didnt experience any of this problems. The carburetor setting 1; 42; N1EI; 3; 158 . Please help me solve this problem becouse I am loosing interest of riding this bike.
I also have a 08 250sx . ive been having the same problem recently, always on idle or when reving to take off withing 15 seconds of starting. went one size down on idle jet and 1/2 out with air screw.now at 158 main 40 idle 1 1/2 turns out,stock needle 3rd groove.... thought it was solved but eventually blew another plug at about 1/4 throttle a min or two after starting. but it ran better at idle and off idle. sounded better too.
think ill go one groove on the needle next and see what happens.
its definitely a jetting issue!!!
Posted on May 19, 2010
Hi had same problem changed to a ngk 8 spark plug run fine since
Posted on May 19, 2009
Hi and welcome to FixYa,
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.
Posted on Dec 07, 2008
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