honda cb 360t

Hey guys, been awhile. So I purchased a 75 cb360 last year and have went through hell and back with this bike. She was running perfectly fine about a week ago, got new tires on it and took her out for a ride, next day I started it up and it was only running on 1 cylinder, I redid timing, cleaned...

Trying to finish up my 360t project bike, got everything working properly but noticed the bike has a loss of power, and seems like it is only running on one cylinder, how do I go about checking and fixing this? Please elaborate in detail, thanks!