Need some help getting my wifes 2001 xr200 running right. It blew a head gasket earlier in the year that was repaired at the dealer. It ran good for about 5 hrs after that then we started having problems getting it started and keeping it running. I could get it to start by leaving the choke on 1/2 way but then you had to stay on the gas to keep it running, as soon as you let off it would die. I figured that it probably has something to do with the jetting but I don't have a manual and can't figure out how to adjust the carb ( can't find the mixture screws, only the idle). Any help would be appreciated as I hate pushing her bike through the trails for her.