Thanks for the add

[jake650]

Got a Cb650c RC03 engine.
About to rebuild as have an cylinder head oil leak,
Got David silvers gasket kit to do job but found out (luckily) that head I rings are too small in kit to seal it. Bike starts but needs persuasion from easy start. I have pods but bought original air box to fit after build.

[Athame57]

Hello Jake and welcome here! 

[McCabe-Thiele (Ted)]

Hi Jake welcome to the sohc community,
I know close to nothing  about the CB650 just a bit from having rebuilt a CB400 after 50 odd decades since I owned a 250 Dream circa 1965.

[Johnny4428]

Hi Jake welcome to forum and thanks for boosting the Scottish contingent on here. Common problem on here with after market gaskets being thicker than originals making the o rings inadequate.