KDXRIDER.NET

The 93 kdx 250 has two screws one that is closer to the float bowl and gold and then there is a silver one with a spring around it closer to the top which is idle? Is one of them the air/fuel mixture screw? Neither seem to make a difference when adjusted.

The one with a visible spring is the idle. The smaller screw you see is the air/fuel mixture. If neither make a difference then your low speed circuit / pilot jet is probably gummed up.

I took the carb off and took it apart and cleaned it with a carb and throttle body cleaner. I also cleaned my filter. Put all of it back on the bike and it ran but was still not idling without the throttle and dies after a few minutes of riding. So I then re evaluated the carb and checked the reed valve and it all seemed to be alright. Only thing else that was wrong was it was blowing oil out the head pipe because of the worn out o'rings. I tried as best as I could to reseal it but the bike won't start now. Any ideas?

probably fowled the plug try a new spark plug

If it has stock jetting its way to rich. If the pilot circuit is way rich the air screw will have very little effect. I ran 32 155 #7 slide and two sizes leaner on the needle and a br7es plug .most run a slightly richer pilot jet.I also had to change the jet block gasket in the carb.

Could that prevent it from running?

Yes too much fuel while starting can foul the plug causing it not to start

I have a new plug but I'm afraid it's gonna foul again. How do I fix the kdx from running so rich?