Ok I just bought a 1999 KTM 250 SX. I brought it home and ran it for about 45 minutes and it ran decent but was boggy in 1st and 2nd gear and had a hard time hitting power band. It also didn't like to rev up in neutral very easy. Kind of shot a lot of smoke out. But didn't smoke that much at all once I had been running it for about 5 minutes or so. 3rd gear and up it pulled pretty strong and would lift the front wheel up. After the first 45 minute ride, I put the bike away for about 15 minutes, took it back out and started it up. It shut off within about 45 seconds of riding it. Just bogged out. I assumed I fouled a spark plug. Took the plug out and it was black and wet with oil. Swapped the plug with a new one and rode it for about 10 minutes and it bogged out again while I was riding it. Put a new plug in it, and it wouldn't start at all. I then checked the float level, it was way out of spec. Adjusted it to what I think is the proper setting. And it still won't start. It has a new plug, fresh gas, air screw at 1 1/2 out. Carbs sparkly clean. Air filter clean. Float set right. Gas mixed at 1/50. I decided maybe I got a faulty plug, went and got a new one. Found out the 3 other plugs that were in it were the wrong type? They are b9es. The one that my bike calls for is BR8ECM. So I bought the BR8ECM and put it in, bike still won't start. Some one help, I've been trying to get this thing started forever.