If the bike starts, but runs bad with white smoke I would suspect that you have a leak in the primary drive oil seal. It is the tranny oil being sucked in that makes the smoke.
If it runs and idles fast with the throttle closed the oil seal on the other side is letting air in under the ignition rotor.
If it it backfires you might want to pull the rotor off and check the woodruff key has not sheared, but that is a "big" bike complaint normally. Is there any reason that the ignition timing could have changed?
If the plug is wet, you are either getting too much fuel - double-check that the float valve is closing OK etc. - or the plug is fouling while the engine is turning over without a spark. If you can see a spark, and are using a new plug, the ignition should be OK, but you might want to have it checked by a dealer.
I believe a compression test will only show the quality of your top-end seal i.e. the peak pressure that the pistion, rings, and top-end gasket can create when all the ports are closed. A leak-down test down by a dealer will check there are no leaks between the carb, head, base, exhaust, crank etc...
_________________ Michael Stiles 1979 Honda CR250R Elsinore | 2006 Husqvarna SM510R | 2007 Service Honda CR500R-AF
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