Battery died, so i pulled it out of the bike and charged it at a 2amp for 5 hours. battery volts was around 12.3 volts, shouldn't be to high. Put battery back in bike and atempted to start, as soon as i turned switch on to start cdi box starts to smoke. Any help be nice.

 

Polarities reversed?

 

I'd checked that the first time the cdi box smoked. replaced it with new one and started bike. it ran for a couple min and died after the cdi started to smoke again..

 

I am having the same problem, My battery died so I charged it. After it charged I started the bike, it ran terrible and died the CDI box was very hot. I replaced the CDI and it ran for a few minutes and died again. I also noticed that the Tach did not work. Will a bad battery burn up the CDI box?