Crf 250 startup problems

[Lukekelly]

My friend wants to get a between 03 and 05 crf 250r but says it has problems when you hot start it, what is the problem?
also do the intake and exaust valves hit the piston when you use the decompressiol lever like on the ktms?

 

[T-Bone]

Jetting is too lean try a JD jetting kit

 

[whenfoxforks-ruled]

also do the intake and exaust valves hit the piston when you use the decompressiol lever like on the ktms? What's that about?