The starter solenoid . If it clicks but the engine doesn't turn there is no power getting through to the starter but power to the solenoid. To check wedge a screwdriver/spanner between the connections on the top, if the motor spins the contacts inside the solenoid are burnt.Ps be ready for some sparks when you do this!
Coils, put spark plugs on the HT leads, earth against the engine or frame and spin the motor on the starter, you should have sparks.The pulser coils in the engine side casing often stop working.
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http://www.electrosport.com/technical-resources/library/diagnosis/fault-finding-guide.php
Plus check this site out if you have a 400 import
http://www.400greybike.cc/newforum/viewforum.php?f=29
Pick up a shop manual. It will tell you how and what to check for coils. I don't know the specs off hand for your coils (they are generally in ohms which measure resistance) or which wire to connect to the multimeter where. You need a shop manual to test coils to get the specs on how many ohms there should be. Make sure the battery is 100% charged and read the manual for your multimeter. You can pop the fuse if you use it wrong and or damage the meter. To test a solinoid you'll need a helper or you can do it yourself but it helps to have someone push the start button for you while you watch the meter. Put the multimeter in DC volts (I believe there is postition of 20v and under but dont use millivolts, I dont have mine handy to look at and my memory sucks anymore). Have the helper push the start button and put the + lead on one terminal (the one coming from the battery) and the - on the other (the heavy one leading to the starter) it should show a voltage (around 12 or more with a fully charged battery)when the button is pushed with the key on. To see if you are getting power tot he solenoid unhook the wire coming from the start button (again this is where a shop manual helps but it's usually a real thin wire) place the + lead on the wire and the - lead on a ground ( engine, frame, - battery term). have a helper push the start button with the key on. If you have voltage to that wire thats close to battery voltage then you are getting power to the solenoid most likely. You can also test that way with a test light. I know I'm forgetting stuff but you get the idea. Oh yeah, check all your fuses first to make sure none of them are blown.
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