Cg125/175

[Cg125nut]

Would like 2 know what bigger engine I can put on a 125 without stripping whole bike down .... use same lume if possible. Thanks

[Cagiva4ever]

are you talking about aircooled pushrod vertical cylinder CG type engine(s) ?

if so, then you have option of 200cc and 250cc versions from Chinese bikes, made by Lifan ZongShen etc clones of theirs..
^^they are based on Honda CG125 engine. basically just bigger Bore..

look for their diagrams for engine fitting measurements. they exist as .jpeg photos, Google them.
photos are basically autocad blueprints from factory, sometimes attached into partsList pdf's or owners manuals.