I really need help i have a gsxr 600 2000 model .. .my friend put the battery the wrong way round and now wont spark ... I have changed all fuses . The cdi rectifier coil bypassed the kill switch side stand switch and clutch switch but still have no spark from any spark plugs i changed a black omron box near to the cdi i don't know what that is called . I have disconnected indicators as all work lights work horn fuel pump all works it turns over but no spark ive changed all 4 spark plugs .. Umm ive cleaned all 4 carbs i don't know why i just got bored of trying to fix it .. Ive got to the point where i have no idea ive tryed to learn how to use a multi meter or volt meter but i have no idea what all the numbers and settings are ive watched videos i just don't know ... I am so so stuck and been told it will cost alot just to get some one to look i just don't know what to do