Replacing Old Rubber Engine Parts

I'm getting ready to do a starter valve sync on my 2008 bike, which has become a bit hard to start when cold.  I've already got some 4mm silicone vacuum line coming to replace the four starter valve lines.  Anything else I need to change while I'm in there that could be letting some air in?  

In addition to the SV lines, there are connections for the fuel pressure regulator and the flapper valve.