So please excuse me as I am new to the sport and this forum. So I took my 2011 kx250 to the shop to have a tune-up because it wouldn't start without the choke (even when hot). I was told the valves were slightly under spec and needed to be shimmed. I told the shop to go ahead with the repair and yesterday I picked up the bike and when I got it home I couldn't get it to kick start. The bike bump starts just fine and seems to run fine when started but I cannot for the life of me get it to kick start. I called the shop and they said I need to start let it run for 30 minutes and stop the bike. After doing this a few times it would kick start just fine from there forward? I have searched high and low and cannot find any info on this? I should note the bike is also considerably harder to kick now. I will admit I am not overly knowledgeable with all this, but this all seems like a load of crap to me. In my head I keep thinking this must be a timing issue or bad shim job. Does anyone have any suggestions?