When I put the rubber gaskets on the engines I make sure I use a little lube, it keeps them from having friction when putting on, and then when I take the pipe off! When taking off it’s a risk, most of the time if the engines been used it’s going to be dry on the gasket and there’s nothing you can do it’s just going to rip, but if u look online there’s plenty of places u can replace them for less then a few bucks and it’s worth it to know your engines sealed. Just replace it. It has to be replaced if it’s ripped. That’s just the nature of the hobby. If u use it knowing it’s ripped just expect yourself to be tuning all day on your needles. After almost everyday I run or two days of running I tear down my engine, I clean everything and there’s always a ton of crap inside that has to be cleaned and I use vasoline on my air filter so I know I’m doing my best to keep dirt out, I clean outside the engine especially the carb area to make sure it’s not sucking air threw or around the carb boot. These engines are machines, sucking air like you wouldn’t imagine and they have so many places they can leak so your best way of handling it is clean clean clean. It also makes figuring out an issue easier when the engine isn’t being consistent. If u clean your engines meticulously like I’m saying I promise you will never have issues. You will always catch problems before they start causing issues.