have a electeical problem, just can´t figure out. Can only ride bike for a few minutes before i start to loose power. This doesn´t kill the battery and will turn over, but the bike will not start back up. have power from the stater and power to the coils. i have spark to the plugs. The bike just stops running and will not start back up until i change the plugs. Once i change the plugs i can run it again for a few minutes but then i´m back to square one. Help needed.