hey welcome to the forum!
i cant really help you too much on the first part, all i can say is my 250r does it and i dont think anything of it haha.
but for the second part, im pretty sure that it has a special rev limitier like most utilities that restricts speed/rpm's while in reverse. when the rev limiter is doing it's job, the engine will sound like crap, no worries. just try to keep the revs under that speed.
hope this helps!
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