check the obvious first. kill switch, TORS switch, ignition switch, and ground wires, etc. has a safety tether been installed? these can cause issues. lastly, go for the stator and check the output. easily done on the sled.
there are no tests for the cdi, short of swapping with a known good one. so by eliminating the items that you can troubleshoot, you may or may not be led to the expense of the cdi. i always assume that the cdi is good until all else has been tested. valid offering though, lets add coils to the list as well.
check to see if you have power going into your coil with a multi meter as someone is pulling it over, if oyu do then you know its your coil and if oyu don't start testing other conponents like snowdad4 said, and it may sound stupid but make sure the plugs are brand new and never been dropped or anything ( i had a new plug that had been dropped and it wouldn't spark right out of the box)
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