110 engine 4 speed box

hello to you all.

Im new here.and new to mini bikes.A year or so ago i had the pleasure of picking up on ebay a very nice dax.Its not original but i really like it.I was told it was imported from vietnam.It says on the log book and the stickers on the side thats its got a 110cc engine which has honda on the engine casings.It also has a 4 speed semi auto gear box.After a little research i have discovered that honda makes a 110cc 4 speed semi auto bike which the austrailian postmen use.

what do you guys think can this be my set up or is there a more likely answer.Also are the 110 engines just bored out or have differnt sized cylinders on the same honda cub bottom end so parts like the clutch ect will be the same as the standard st 70 engine.

Any comments would be greatly appreciated

Most might have a Honda Wave engine fitted.
The engine cases, clutch, studs, crank,... are all different from the standard minibike engines.
You'd be looking for Honda Nice or Wave parts. (and some Chinese knock-offs)

Thanks Waynus for your coments and taking the time to answer my question