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Master LTR450
12-01-2007, 10:29 AM
ok my 400ex has spark one minute then the next minute its gone? Any ideas other than the boot being loose?

babiak400ex
12-01-2007, 01:03 PM
This is what clymer service manual says.
If spark appears weak, or fires inconsistently check the following areas for possible cause:
A. Fouled / improperly gapped spark plug.
B. Damaged / shorted spark plug lead and cap.
C. Loose connection in ignition system.
D. Damaged igniton switch.
E. Dirty / shorted engine stop switch.
F. Damaged neutral switch.
G. Damaged coil.
H. Damaged ignition pulse generator.
I . Damaged ignition control module.
Hope this is some help.