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You should definately look into your wiring situation. The reason electric start bikes are wired so your lights and stuff go off is because the large amount of load the starter motor puts on your battery. It really needs all the power it can draw from the battery. As with any electrical trouble shooting. Make absolutey sure your battery is up to shape. Make sure it puts at least 12.2 vdc out before you try to find an electrical problem. When I was working in a shop, I had many people bring in bikes with problems similar to yours. The battery just couldn't make enough power to turn the starter motor, but had ample power to illuminate the lamps. I believe it would be best to first check your starting system. All starting systems are the same really, consisting of a battery, a starter motor, and soleniod, and a relay. Check the connections between those components and make sure there are you loose or dirty wires. Get a meter and start doing voltage drop tests and resistance tests on your starting system.
 
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