スーパーカブを激安ボアアップしたら白煙を吹いた件

I installed a bore-up kit for my Cub 90, and white smoke started coming out of the muffler... It was really cheap, so I bought another one, but the same white smoke started... It seemed like I was going through a never-ending cycle of buying, getting white smoke, and buying again, so I opened up the engine and made this video to investigate. At one point, I said the 41.4mm stroke was 41.5mm, but to make it easier to calculate, I said 49.5 - 41.5 = 8mm difference. The actual difference is 8.1mm, so please bear that in mind. By the way, the TikTok account "Super Cub-Sen Hiro-kun CH" is a fake, so I cannot respond, so please be aware of that. (I'm currently suing him for copyright infringement.) I'm only on official LINE and Instagram.