Compelet engine dignose and overhaul GS150SE

Guys this is first video of my GS 150. after 124000Km i have engine performace issue. this is ,my 2nd engine work. first was at 34000km in which 0.50 size ring piston installed and now after 89000km more driving this bike needed 1.00 size Ring piston, timing chain, and piston rod new installed.