I have a 3V 107 SDG (Lifan really) and it is ok after you put in a hi-performance cam and piston.....port the head and it should be better.....they are 1 down 3 up for the most part...some all up out there......trans are prone to false neutrals if they are not shimmed correctly and with a proper shift star......probably not an engine that you will not have to break into to m,ake sure that it was set-up correctly....can be a little screamer though and not many people have them.....but that also means not too many availabe hop-up parts
note the 3v 110cc are the same