If you hear the starter relay click, but not turn over the motor that's a classic low/dead battery situation. There is only enough power left for the battery to click the starter but is not powerful enough to actually turn the engine over.
three ways you can deal with this issue.
First replace the battery.
Second give the battery a charge using either a battery charger or the more common battery trickle charger (battery tenderizer) which most motorcycle owners use to keep their bikes battery charged over long periods of non use like the winter. If you have a tenderizer just hook it up to the battery, plug it into the wall and let it trickle charge for about 12-16 hours or so and then try again.
If the starter is actually turning over but you arent gettting the engine to fire then it has to be one of the only two remaining variables that we need for combustion, spark and fuel. check you spark plugs for excessive wear, carbon buildup or damage, and then check the spacing or just replace them. if you see a spark when you fire the starter than its not a plug issue.
Finally fuel. Is there gas in the tank? can you hear the fuel pump click on once you turn the key to on? is the line creased or corroded, if you unplug the line do you see fuel being pumped in?
those are your three possibilities.
Another easy thing to try to check if it is a batteyr issue and you don't have a charger is to try push starting the bike
- First, make sure that your bike isn't starting just because you are out of gas. If you're out of gas, this will not work.
- Make sure the key is in the on position
- Put the bike in 2nd gear
- Hold the clutch in and begin pushing, preferably downhill, but it will work elsewhere as well.
- Once you've gathered
enough momentum, apply a minimal amount of throttle (not too much or the
bike will get away from you) and hop on the bike just as you release
- Rev the engine a bit so your bike doesn't conk out.
- Ride away.