The engine is two stroke so you have to either buy gas with 4% oil mixed in or mix it yourself, i do it myself as my 1960 moped runs on the same stuff.

CDI ignition, seems really reliable (a lot more reliable than my 1960s moped but i really should get it looked at by someone who know that kind of stuff ).

The engine outputs power for lights.

Ive talked to a local guy that sells these engine kits and have for a while, he says the only parts that really tends to wear are the pads in the dry clutch but they are really cheap(maybe 4 dollars) and easy to replace.

If they wear out and the exact parts arent available im sure one could just cut some from a left over brake pad from a car or something similar, i thought id mention this because of this sites hacker mentality

I bought a replacement kit of pads with my engine but i havnt needed to change them yet, ive been riding it spring, summer and autumn for two years whenever i dont need to travel more than maybe 15 kilometers but i have gone further a few times.

On the fuel consumption i have to say that the estimate is a bit optimistic but there might just be something up with my carburetor even though ive taken it apart and cleaned it.

A friend of mine has the 60cc variation and i think that it is overpowered for use on a regular bike frame as it has slightly bent the back of it, and it does about 60 km/h.

As for legality, here it is illegal. It is an unregistered uninsurable motored vehicle and therefor can only be used on private propery.

Ive never been bothered by law enforcement though, ive been passed by police vehicles several times as well as seen offices checking it out while it was parked outside the burger joint where i was eating at the time.

I think it would be different if say, a 14 year old kid was on it, im a bearded 26 yo and almost always wearing yellow high visibility construction worker clothing and always a helmet when riding.
(Here in Sweden you have to be 15 and get a sort of license for driving a moped if you bought the it after last summer, if you got it before that its alright as long as you are 15.)

Most people smile when i pass by and a lot of older guys come up and want to chat about it as during the 60ies and 70ies Sweden had a lot of bicycles with engines that at the time were classified as mopeds and were legal.

Those old ones are still legal but the new arent because of outdated rules and that the new engines arent regulated by our system yet, i dont know the full details. Bureaucracy ya know?

Anyways, this site is great and i will be following it from now on, i got here from Hackaday