how do i rebuild my piaggio engine w reg?

Hi,
Lee, I don't want to be rude but the lack of detail in the question and the fact that you asked it tends to point to you not being of a mechanical persuasion.
The best advice I can give is to get a mechanically minded friend and a workshop manual and act as his/her spanner handler. This will get your engine built and you learn a skill.

Cheers

westcountry
October 2013