I have a 79 Honda CM400T that I just had tuned up and gone through by a reputibal shop. All was good for the first 100 miles but now I´m having trouble where the bike will start and warm up just great but after I´ve been riding for about 30 minutes or so it craps out and won´t restart until I´ve let it just sit and cool down for a while. Then when its ready it pops right off again. If I try to restart right away it doesn´t even cough or spit or anything, just cranks over but no go. I´ve tried cracking the tank open thinking the fuel cap valve might be plugged and causing vaccuum but that wasn´t it. Also tried opening the carb drains and I get fuel coming out, so seems to not be a float or fuel line problem....tried pulling a plug out and it is dry as a bone, so not getting flooded.....any ideas???