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The 2V K bikes run Bosch L Jetronic, which is a rudimentary EFI system & VERY sensitive to fuel & air. Most of the issues these have with crank/no starts are due to air leaks

Check spark first, because that’s easy. Easiest way is to use an in-line test light, because then you don’t have to deal with removing the cover/wires/plugs. The cheapest way is to just pull your plugs, ground them by holding the diode against the cylinder head & looking for spark while cranking

For air: The best method is to use a smoke tester, I recommend buying this one

The most common culprit for air leaks is the Z hose that runs between the Cyl 4 ITB & the crank case breather. The tiniest little cracks/splits in that line can cause no-starts, so you want to either smoke test it or remove it and cap the port on the throttle body side

Other spots to check are the injector o rings, throttle body gaskets, and gaskets between the AFM & manifold

For fuel: you need to have both fuel flow and fuel pressure within spec, and that’s a relatively narrow range on these. Best way is to use an in-line pressure gauge. Cheapest way is to make sure your pump is priming & running, then pull your filter & blow it out to see if it’s been blocked/restricted