loss of power

I’ve been running my YD 100 really good after breaking I was using 32 to 1 all of a sudden I get power loss I tried changing the carburetor tried changing the fuel from 30 to 142 to 1 checked for air leaks clogged up any leaks but I still have all the loss of power I have good spark it’s lost...

I have a 66cc that's been running great for 2 months. Out of nowhere today it just started losing power when climbing hills or running hard. Starts up fine and runs well when idling or putting around. But as soon as you start to climb it goes, then sputters, goes, sputters, etc. I am certainly...