bout a 93 dr350s recently and was riding it one day out on the trail and out of no where my tach died and i have no power. bike still idles ok but acceleration is horrible. would be a nice race for my 50cc. i let it cool down a little an restarted it. ran like normal after that and within 15 mins it happened again. now every time i start it there is just no power and the tach does not work. any ideas on when could be happening?