Question about 2008 KTM 250 SX

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2008 ktm 250 sx.the bike starts and runs fine until about 3/4 throttle then missfires,i have changed the complete ignition sistem but the problem is still there can any one help.

Posted by c _howie on

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Anonymous

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Sounds to me like a main jet prob.

Posted on May 19, 2010

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cheezomlet

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Sounds like the main jet is clogged, or you have water in the bowl..
First try draining the bowl on the carb, drain into a glass so you can see if there is any water dirt etc... If there is water, it should be fine after that. If its the main jet you are going to have to remove the carb and clean it.

One other thing it may be. If it has a CV carb (constant velocity) the boot may be ripped on the slide causing it not to lift during acceleration.

Posted on Nov 06, 2009

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1 Answer

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hi
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1 Answer

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3 Answers

New spark plugs last 10-15 minutes of riding


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.

Dec 07, 2008 | 2008 KTM 250 SX

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