It is pointless Why to modify the engine to run on fancy fuel if it already runs fine on 0% nitro methanol-gas mix. I wanted to test if adding some nitro I will get a better performance (read: more rpm), and I didn't. For Poulan 25cc 0% nitro works very well without any modification. I guess, for engines with not enough compression or problem with to cold plug adding nitro might help. But for my Poulan I will stay with $2.99 methanol and $2.65 gasoline (plus some castrol oil).

RysiuM