Drosseln = engine damage ???

Hi @ all. I’m “unfortunately” new enthusiast and I want to get a machine. I have a big problem however. namely: 1.What does it do to the engine if it is throttled ?? 2.Can it be that the engine then has a defective or a damage or anything else after throttling?? 3.How much ccm and PS would you recommend me to look for a machine that can also be throttled well ?? Would you be cool if you could give me an answer. THX GreeZ Sleepwalker