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Yukirin
Check your rear swing arm bearings. Any play in these (they are basic on a ybr) and the back end will not play ball with you. Esp in wet and on rougher surfaces the back will flip flop around.
They are very cheap for new ones and not a hard job so long as the swing arm bolt isn't frozen. As others have said, little bikes tyres don't get as warm as heavier bikes so you don't get the same type of grip