I agree. I’ve already swapped the jug, piston, & rings out for new ones that I already had on hand. Took it for a ride when I got it done and started the break in process. I’m not really happy about all that but at least I was able to keep the bike going. It’s not only mode of transportation. And the seller is sending me replacement parts as well. I don’t know anything about porting but I did take a needle file and I cleaned up the transfer ports and the intake and exhaust ports very lightly before I put it all together and also conditioned piston rings before I put them on. I’m hoping this doesn’t happen again. still a rookie, clearly.