I've seen a technical bulletin on the internet about 2007-2010 (N12) engine valve seats dropping out of the cylinder head, and it happened to my 2007. Does the N16 Engine have the same problem? I pulled up the valve seat part number, and they are identical between the N12 and N16 engines.

http://www.engineprofessional.com/TB/TB113017-1.pdf

I've picked up a 2012 Justa recently, and one of the exhaust valves in the #4 cylinder has a hole in it, so I'm wondering if I should replace all the valve seats with the deeper valve seats while I have the head in the shop.

Mark

 

Replacing all seats would be my choice.

Replace all exhaust valves as well. Unless there is significant stem wear, the intakes should be fine to re-use.

 

Do you have a good vendor for the deeper valve seats? Thanks in advance!