Hi Bonnar_Bloke,
The problem with the GCV's and other Hondas' is that damned bolt system to mount all the gaskets and the carburettor is a time wasting procedure. I cleaned the carby several times and replaced it once and each time I had to thread about 6 gaskets, air guides etc. In the end some of them were in pretty bad shape. I got frustrated and ended up replacing those bolts with the rods from a wrecked chonda. A much better system of mounting all the gaskets.