I had my 2007 ninja sitting for 3 years and now it will not even crank with jumpers attached. I know I'll have to drain the gas before it will properly start, but I was surprised that it won't even try to turn over. I'd appreciate any suggestions.
I would suggest starting with a brand new battery, if it's been sitting three years it's gonna need one. Check all wiring and fuses to make sure they are intact. Then I would use a multi-tester to make sure your getting power to the starter. Also, sounds stupid, but check that the kill switch is in the run position.