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Sounds like all there is left is the plug wire from the coil - but it's probably a single unit - coil and wire w/ plug boot.
All that comes to mind is grounding. With a VOM make sure you have a ground. Also look further up the chain - follow the wiring the CDI unit plugs into for breaks. Headlight gets brighter when kicked over ? Follow the wiring to it's termination points, loose plugs etc.
Single cylinder engines vibrate an awful lot, with that in mind look things over. There is a chance the no spark condition is a product of an unrelated failure - ignition system could be fine. Check the stator coil for an open circuit where it should be closed.
Besides checking wire and plug condition, cleaning and tightening grounds. The stator is the first place I'd check.
Be careful and gentle, the coil wires are very fine and as such break easy. A shorted winding will show continuity but not generate power, a web search should give resistance ranges of the coil assy.
Too low fail/Too high fail ranges.
1) Pour redex into spark plug hole. Kick start bike with ignition off and leave for a few mins. Then start up and watch the thick black smokey mess come billowing out of the exhaust and run for it as the nieghbours, parents and everyone and his dog complains about the pollution...
2) More likely, sadly, to need a rebore and new piston....
Check the routing of the wires under the tank. Also check the wire connections. It sounds like the installation of the tank is pulling on the wires causing a momentary disconnection of a power wire.
Alternate to that, are the spark plug wires grounding against the tank?
Hi .... Is this the twin or the four cylinder ? I'd suspect a condensor/points on the twin. Wiring, without seeing it, I'd can't comment on ................. a manual, multimeter & a bit of time would sort it out.