hi mate i have a tmec 125 aswell ive put a zongshen 250cc engine init as gose like fuck the problem with tmec is the exhaust has a cat in the manifold were it connects to the engine, and the carb has 92 jet init you need to upjet the carb to 105 and put a HONDA XR 125 exhaust on it m8 as they cnt have no cat in the manifold :P these bikes are a copy of the HONDA XR 125 not eveything will fit but most will the exhaust will fit the sprockets will fit aswell have a look on honda website for parts of the xr 125 but the rear wheel do not fit as they have rear drum break and tmec have disc but if u wanted bigger wheels you need to exchange the swing are but other than that the honda xr 125 is the same as the tmec just ignore everyone mate i have experance in this situation and know if u want to know anything else please ask