pretty sure its the valves "BUT''

[IRONFLIGHT2]

ok my practice bike wont start for crap. i actually have to pump the throttle like its carbed , but once its running it runs fine and it does it no matter if it is hot or cold. i havent checked fuel pressure with a gauge but the injector is spraying fine and the fuel pump it pumping fuel ( idk if its is the proper amount of fuel but its fuel). this only started happening after is sucked in a rediculous amount of mud and dirt complements of the first neavt race at walden. any suggestions or opinions???

[kfx400rider03]

valves.
just check the clearance on your intake valves if there is any clearance. sound like they are tight. dirt will mess up titanium valves up realy quick because of the special coating on the valves onces that wears off the ti valves they just keep "cupping" or "strecthing"