Questions in reverse.
All chainsaws use Walbro style diaphragm carburettors and they
"all" use thermal isolation spacers. That said, you
"will" need to install a thermal isolation spacer with a diaphragm carburettor.
Because this type of design carries a very small amount of fuel inside the fuel passageways, it is very susceptible to "heat soak" and fuel vaporisation, which makes the carburettor untunable and virtually inoperable under such conditions, hence the reason why a thermal barrier is needed for this type of design.
There is no reason why you can't make up a thermal isolation block, but you will need to use a machine grade plastic, designed to be thermally stable under high temperature. The most commonly used plastics with this specification are "
Meldin or
Vespel" - Meldin 7001 being the lower cost variant of thermally stable and mechanically durable engineering grade thermoplastic.
Yes, you can order a thermal isolation spacer from Rock Solid Engines, as described in my threads
here and
here.
Read both of the threads carefully and you won't have any problems getting the reed valve intake and diaphragm carburettor installed and working correctly.
It might take a while for the pages to load the photos if you have a slow internet connection as they contain a lot of photos.
