Hi everybody. My buddy's 2000 XL650L died on his way home and he is all bummed out, Expecting the worst. Bike has 20,500 miles, regular maintenance, valves, & oil. Stock except for jetting kit and K&N filter. He started bike, let it warm up, rode 5 miles and it just quit. Will not restart. Guessing to check the basics, spark plug, fuel to the carb, valves??? Any other ideas? Thanks.