Long story short, hadn't ridden it in a while and let the carb get gunky; no worries, rebuilt the carb and tried to start it. Bike tried to turn over more, but still didn't start. Checked spark plug, carbon buildup like a motherfucker - replaced. Tried to start bike, and would idle extremely weak and then die - any throttle the engine would die. Said eff it and bought a new carb (Mikuni off of ebay). Finally got it installed (wasn't a direct bolt on) and kickstarted the bike - voila, it turned on. Let it idle for a bit and then gave it some gas and there's steady while smoke coming out (similar to how a carb'd engine is when it first starts). After a minute or two of idling rough-ish, it died. Restarted it and it died thirty seconds later. Went to kickstart it again and the compression seems comically low (I don't have a tester). I guess all of the above is a longwinded way of asking - is there anything else I should trouble shoot before getting the engine rebuilt?