If ya need a hub,muffler,ect just go to horizon hobby and buy the parts.Its the same as a G23 i believe.You can also talk to the people listed below.
chignitions
rcignitions
weedwackerengines
indianasmallgasengines
carrprecissionmaybe
brillellimaybe
myself,plus about a half dozen people from the engine conversion forum.Plus look at the echo conversion threads also.