Hi please can any one tell me if it is normal to re'bore a 125 cylinder that's if it can be done, and where is the best place to buy a new piston and ring etc. 

They aren't rebored but the lining of the barrels are replated with a special coating of Nikasil chrome.

 

First, buy a new piston kit (new base and head gasket as well), your Beta importer should have them.

 

Then send the new piston and barrel to a specialist Nikasil cylinder plater.

They aren't too many of these replaters around, most end up here

http://www.langcourt.com/index.html

Or their American outlet.

 

They will remove the worn lining, replate and hone it to exactly match the piston you supplied.

 

Edited June 22, 201511 yr by goudrons