So this one has me stumped. Have a 1989 ZXR250 that I got a week ago. This morning was going to take it out for a run. Went to start bike and would crank but not start, thought battery might have been a little flat so threw on the charger for 20 minutes. Came back and started it up and let it run for about 5-10 minutes to warm up. Was waiting for a mate to come over so turned bike off and went back inside. When he arrived some 15 minutes later I went to start bike again. Started to crank but wouldn't start. Tried again and nothing, but could hear battery dying. Battery? Took it out and went to battery place to get a new one. Guy said battery he had was slightly taller (maybe 5mm) but figured had enough room so took it home. Connect leads and started it up, boom started as soon as I touched the starter. Cool, so I turned it off and went about putting things back together. When I put the metal bracket on (one that bolts tank and seat support) got some sparking. Because the battery was slightly taller and the leads were connected on top it was enough for the bracket to touch the terminals. No worries, we turned the terminals so they were mounted sideways and give enough clearance. Turn on bike and nothing, not even a crank. Weird we think. Well let's put terminals back how they were and leave bracket off to see if it starts. Nope, won't crank over. Have lights so we know battery is working. Starter motor? Have a spare bike here so took the starter off that (unsure if it does work) and decided to see if it would work. Nope still won't crank over. This is a photo of the starter we took off the bike. There is insulation on two of the wires only, should it be on all four wires? So the battery is brand new, showing over 12 volts on the multimeter, but have it on charge overnight anyway. When we put the starter back together I noticed it is harder to turn than the one off the spare bike. What's the simple way of checking if the starter is working? Did a google search and could only see a method for a car starter. This involved connected jumper leads to two terminals and then an earth. But my starter only has the one connection point. I'm sure this is electrical and my experience in that department isn't that great. Am I missing something obvious? Got me stumped, we worked through it logically and tried to work out scenarios. When the bracket was connected and it sparked off the battery terminals could it have blown a fuse? Nope, check them and they all look fine. Know the battery is fine as it started when I first connected it. Next step will be to take it to a bike shop to get looked at. Any ideas???