Ah there you are Ben, we spoke about a back wheel for your PE a while back. I have a flywheel puller you may borrow if you need to get the flywheel off your PE. These blokes are seasoned campaigners with the PE models so your in good hands. I figure if you have spark, your on to a good start. As I said, electrical parts can be difficult to source for the PE250/400 for reasons I am sure I dont know, most other bits are still around and a good deal of them from Suzuki. Perhaps Oldfart is on to it, flogging the flywheel with a mallet would probably stuff the magnets. I am tipping that the starter or choke circuit needs a second look if you say the the plug is wet and the plunger is not moving freely. I am happy to lend a hand if you need it, sometimes a good push start is in order if shes loaded up. just make sure all the controls (brakes, shifter and clutch) are working well before you launch it down a big hill.
In the meantime, check the clutch is not sticking if the bike has been sitting for a long time. If you recall I was speaking to you about some of the issues I experienced reviving an old PE250, I mentioned the elec issues but also the the clutch plates were frozen (friction discs and pressure plates stuck together). I remedied the problem by dimantling the clutch and giving the plates a rub with a sheet of wet and dry (about 240) flat on a sheet of glass. I needed to crack them apart carefully after a little soak in oil first, but it all came good with a little care and patience.