fz250

Hi guys, I'm in Japan riding a little FZ250 manufactured in 1988. It's very similar to the FZR250 race replica of that era. It's been a good reliable bike most of the time but I've left it sitting for a few months now unused. I've been running the engine about once a month but with winter I've been a bit tardy in my maintenance. Now the bike battery is flat, so I was cranking the engine using cables connected to a car battery as the bike battery was flat. The engine started cranking as usual, but it didn't fire. I tried again but suddenly lost all electrics (lights out & now power to starter). I checked the fuse but it appears to be OK. There's a little pin like button near the battery that's inside a clear plastic case that sometimes releases if there's a spike but that's still depressed. I'm at a loss of what to check next. Anyone got any ideas?

Hi guys, I'm in Japan riding a little FZ250. Good reliable bike most of the time but I've left it sitting for a few months now unused. I've running the engine about once a month but with winter I've been a bit tardy in my maintenance. Now the bike battery is flat, so I was cranking the engine using cables connected to a car battery as the bike battery was flat. The engine started cranking as usual, but it didn't fire. I tried again but suddenly lost all electrics (lights out & now power to starter). I checked the fuse but it appears to be OK. There's a little pin like button near the battery that's inside a clear plastic case that sometimes releases if there's a spike but that's still depressed. I'm at a loss of what to check next. Anyone?