hi i'm the lawnpimp new to the site but could really use someones knowledge I have an 04 250 commando liquid cooled it was running fine stopped to switch riders and it just stalled out restarts when you jump it but as soon as you remove one of the jumper cables the bike stalls out kepp it on and it revs and sounds fine

 

Clean the carb. Sounds like a plugged jet.

 

the carb did need to be cleaned added a fuel filter and also had to add a toggle switch to some sensor or something it would drain the battery keep it from charging and if disconnected keep the bike from starting

 

also thanks for your help