Yamaha big bear no spark

I'm not familiar with all quads and all the kill switch locations. Does it have a tip-over kill switch? Is it working? Is the quad in neutral? Is the neutral light on? Many engines will not spark if the neutral light is not on. Are the headlights off when starting?

How good is your battery? A low battery can kill spark. Test for spark by grounding the threads of the plug against the cylinder. Have a friend kick the bike while you watch for spark. Assuming no spark, then check all the kill switches with an Ohmmeter to be sure each switch is working properly. Sometimes a switch goes bad. Try disconnecting all kill switches then check spark.

Check the wiring harness, even under the gas tank and seat. Are all the connectors clean and with a tight connection? Any abraded wires? Check the ignition switch also. The switch can go bad as well. Are the flywheel coils good > is the battery getting a charge?

Still no spark? If CDI then get it checked.
If points then file or replace them along with a new condensor and reset the gap then time the engine. >> I hope this helps.

Please rate this answer. Thanks trsrhntr!

To the fellow with the big bear , i reciently sold one with the same problem, the problem was tracked down to the source coil, basically the internal parts consist of 3 major components, the stator, the pick up coils, (yes mine had 2) and the source coil. Unfortunatelly i found that they all had to be purchase in one package as the wiring is intrigrated together, did find that the pickup coils could be purchased separately however that requires a harness splice. The source coil provides the current to fire the coil, hope this helps