Hi
The OS 8 plug is too cold for our purposes.
To stay at home OS an excellent replacement for the Enya 3 can be OS 6 (Formally A3) or, a little colder, the OS 7 plug.
Also the F plug for the 4 stroke is excellent on our engines
It is possible to use the OS 8 plug when the air is really hot.
Regards, Massimo