Auto Parts: Engine Sizes, 49cc engine, centrifugal clutch

Question
QUESTION: Hi Mike, I am hoping that you would be able to answer my question about small engines. I hope that I have asked the correct person the question I'm about to ask you. My question is about the power of small engines. I'm a beginner when it comes to engines and am working to become more of a handy man with them. My question relates to CC and Horsepower. I am not sure how they relate but the problem I am having is that we are working on a Moped. We are trying to make it home made with a chain drive. The question I mainly have is about correct CCs. I am about 155 pounds and I need a small 2 stroke engine that would be able to move me. The laws here in my state say that it must not exceed 30 mph, and must not be larger then 2 hp/50 cc. I am looking at smaller engines suck as weedeaters but they only seem to have 20-30 CC. I would not know what the minimum CC is for any project. I plan to use it as is with the Centrifugal clutch as my engage and disengage during use. I really appreciate your time and help if you are able to help me! Sincerely, Tanner.

ANSWER:      It is pretty much a law that applies in all states: all mopeds and scooters can be no more than 49cc.  So, you need to choose a vehicle that uses a 49cc engine.  I don't know of any state where this law does not apply.  You can use a bigger engine, but you will need a helmet.

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QUESTION: I plan on wearing a helmet as is. Anything over a 50cc engine requires an M Certification on the license it seems.What is the minimum CC an engine for a moped for someone of my 150-160 pound size should have? I am having trouble picking out something as I cannot find a 49. If i were to have a range of say lowest being 30 to 49 then it would be much easier to find an engine to size! Thank you for your swift answer too!

Answer
    Needless to say, wearing a helmet is always a good idea.  I've seen people who weighed several hundred pounds riding a scooter, but I wouldn't recommend it.  If it was me, I'd stick with a 150.  There are lots of them around and they have plenty of power.