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Yamaha big bear 400 4x4 2008 ifs


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When you changed the stator coil the new pick up was not with it? They are usually bundled and wired together. 

An intermittent spark usually is a loose connection, worn ignition contacts or an over heating part.  

Check the secondary ignition coil and the spark plug wire coming from it.  

I’ve seen pick up coils fail after they get hot and work after they cool down.  I would go over all the connections, grounds etc and start there.  Then get into the more invasive stuff.  Wiggle the ignition key while it’s running.

If the bike shuts down after a while be ready to test the pick up coil with an electrical tester to see if it’s getting hot and breaking down.  Check the regulator/rectifier that’s it’s not getting hot or failing.  Look up the spec in the electrical portion of the manual and it will tell you the numbers you should have on the tester. 

 

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