Not sure dude, ive seen a few come and go at work and only one had to be pulled down as one of the bearings had fractured and caused a mess in the case, nothing i havent seen in lifans and some other engines, as for them taking big bore kits and the other gear im not to sure at all, if i get a chance i will grab the engine mentioned and try and measure up some bits to see if anything yx-ish or gpx gear will suit, as far as i know the shineray 150cc also comes in electric start and with a reverse and is so far the only 150cc that i have seen with reverse and semi auto(maybe other semi 150s with reverse, but not sure).