i posted before and fixed the bike up but this problem still happens new piston good reeds yamalube 32:1 stock main 48 pilot 1500ft above sea level 02 yz250 clean air filter with filter skin. runs fine and then it just dies, put a new plug in and its starts up. plug lasts an hour or so of trail riding and some logging roads, i am thinking electrical since it just started out of the blue. what should i replace first? i was going to take it into a shop but thaught i would ask here again first.