Bogging on up hill suddenly

Hey everyone, so built my first bike, 49cc 2 stroke I got from ebay one of those cheap Chinese ones. I had a really difficult time getting it started at first and posted in here to discover it was an air compression problem so I made a gasket, put some sealant on and it worked perfectly! Took it around up and down hills road it for a while( too hard) for the first time, stopped to talk to a neighbor for a while and when I started again the engine had problems and the gasket I made blew shortly after during the ride. (maybe it overheated while I was stationary?). I made a new one but now the engine gets bogged when I try to go up most hills unless I have very fast rpms to start. Ive read a bunch of threads saying that its normal and you need fast rpms to get up hills since these bikes are low power but Im not sure since for the first ride the bike was capable of doing hills that I now cannot do without peddling. So Im wondering is this normal and maybe the first ride was a fluke or am I having more compression issues or is there another possible problem? Thanks for reading all of this any help is appreciated!