Yes order a gasket kit. Order an engine oil seal kit as well.
Why did you have to remove the engine? 99% 0f all repairs to gy6 bikes can be done with the engine in the bike. I have never removed an engine to replace a cvt belt, perhaps you should research and familiarize yourself with gy6 engines BEFORE continuing to work on this bike, as trying to learn how it works by dis-assembly is a really, really bad plan.
I very confused about why the engine had to be removed at all, as you describe a carb or CVT issue, not valves. If valves were the problem, it would most likely not run at all, and be very hard-starting when it did. I'm willing to bet you have an issue with your decelerator diaphragm or some other minor carb issue. Also why did you remove the stator?
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2011 Roketa MC-23-150
4T 150cc 157 qmj
24mm carb w 115 main jet and paper cone air filter
Manual petcock w Tygon fuel lines
Scrappy Dog Scooters Retro-slash stainless straight-thru exhaust
RED spring clutch
Adjustable CDI (brand unknown, it's blue and red and works great!)
KOSO high performance variator w 12g sliders
Gates Powerlink 835-20-30 belt
GPS verified 65mph on flats.
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