400ex not starting

[4oorider]

i just recently put on new exhaust, K&N, and jet kit. It will not start now. i have checked all the wiring. There is all the fluids in it. There is spark. i have no idea what is going on can anyone help

[4oorider]

itll start up sometimes then just die right away

we tired ether and starting fluid but no help either

anyone???

edit: does anyone know what jet size they are running with just a slip on and a K&N

[m1ke]

Pull the spark plug. Is it wet? do you smell fuel? is the plug still working? Burn the junk off the plug if there is any with a torch. Sounds weird. Timing off? it's REALLY hard to diagnose is without actually seeing/hearing it. If the plug's dry, fuel delivery problem. If it's wet, your getting fuel and there is something wrong with timing/compression/valves/coil/cdi (one or more)

[PismoLocal]

jet your carb bud, im at sea lvl and i run 155 main, if i was you id start at a 160 and jet up from there, i dont know what elevation your at but you should prolly change out your pilot too and adjust your needle.

[300ex mxracer]

sounds stupid, but is your gas on? alot of people find out that gas off is their prob.