HELP I just got a 99 650L and it will just die like the key is turned off while riding. It seems to happen afer about 15 minutes. If I wait 30 seconds it starts up right away (sometimes with a backfire) runs great but will die again within a few miles. Otherwise it runs perfect. Have tried driving without gas cap. grouned safety devices, cleaned carb twice, removed tank filter, gas flows freely from carb drain. There may be a relation to engine braking a minute before the problem? This problem can happen on the highway at 55 mph ot in first gear going though rough rocky terrain.