So last time I rode the bike, it stalled out down the street from my house (on my way back in) after a short ride. I tried to restart it, it then backfired about as loud as a rifle out the exhaust, shooting the silencer end cap and spark arrestor across the street and blowing the silencer packing halfway out. I removed the mangled packing, replaced the cap, and it will not start. I know i should replace the packing, but it should fire up without it, right? tried all of the usual tricks, but every time i just keep kicking and nothing. I replaced the plug and it has spark. its getting fuel and the compression is unchanged. the most I have gotten while attempting to start it has been a mild backfire out the exhaust. and I'm confused. Any suggestions?