88 Kawasaki kx 250 exhaust Valve?

Hey Guys I got a quick question for ya. I have a 1988 kx 250 cylinder that is toast. I have a used 1989 cylinder that is in good condition. These cylinder are the same except the Center Exhaust valve Flapper, the flapper for the 1988 will not fit the 1989. Can I run this cylinder with out the center flapper and what will the down fall of doing so be? Thanx For All the Help.

FrankenBike. Happy jetting without it. It sounds like a hassle.

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